{"id":7129,"date":"2024-01-29T18:52:59","date_gmt":"2024-01-30T02:52:59","guid":{"rendered":"https:\/\/shengenfab.com\/?p=7129"},"modified":"2026-05-14T00:37:05","modified_gmt":"2026-05-14T08:37:05","slug":"what-is-mill-finish-aluminium","status":"publish","type":"post","link":"https:\/\/shengenfab.com\/ko\/what-is-mill-finish-aluminium\/","title":{"rendered":"\ubc00 \ub9c8\uac10 \uc54c\ub8e8\ubbf8\ub284: \uc81c\uc870 \ud55c\uacc4 \ubc0f \ube44\uc6a9 \ud2b8\ub808\uc774\ub4dc \uc624\ud504"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7129\" class=\"elementor elementor-7129\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-54f00433 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"54f00433\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-22a7b48e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"22a7b48e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3e58fb3c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3e58fb3c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-72897d11 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"72897d11\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7698b394 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7698b394\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e5279c9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e5279c9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-60e4f7c9 custom-ele-section-css elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"60e4f7c9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-296c9fed\" data-id=\"296c9fed\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c5a3bf4 elementor-widget elementor-widget-text-editor\" data-id=\"c5a3bf4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Mill finish aluminum is the raw, untreated metal directly from the extrusion or rolling process. It features a natural, matte, or semi-bright appearance with visible manufacturing lines. This cost-effective, functional finish is ideal for industrial components, structural framing, and hidden parts where durability and economy outweigh aesthetic perfection.<\/p><p>However, specifying mill finish also introduces engineering trade-offs. Surface inconsistency, limited corrosion resistance, and coating preparation issues all become the responsibility of the design and manufacturing teams.<\/p><p>For applications where dimensional stability, electrical conductivity, or thermal transfer matter more than cosmetic appearance, mill finish can be the correct production choice. The key is understanding its real manufacturing behavior before releasing the drawing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2366dd5 elementor-widget elementor-widget-image\" data-id=\"2366dd5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"700\" height=\"391\" src=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/What-Mill-Finish-Aluminium-Really-Looks-Like.jpg\" class=\"attachment-large size-large wp-image-24770\" alt=\"What Mill Finish Aluminium Really Looks Like\" srcset=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/What-Mill-Finish-Aluminium-Really-Looks-Like.jpg 700w, https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/What-Mill-Finish-Aluminium-Really-Looks-Like-300x168.jpg 300w, https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/What-Mill-Finish-Aluminium-Really-Looks-Like-18x10.jpg 18w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6446ef5 elementor-widget elementor-widget-text-editor\" data-id=\"6446ef5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 class=\"wp-block-heading\">What Mill Finish Aluminium Looks Like on the Shop Floor\uff1f<\/h2>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Mill finish aluminium is not a cosmetic-grade surface. It is a functional industrial surface that reflects the extrusion, rolling, and handling processes used to produce it.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Natural Oxide Layer<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Aluminium immediately forms a natural aluminium oxide (Al2O3\u200b) layer once exposed to air. This oxide film slows further oxidation, but it should not be treated as engineered corrosion protection.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>The oxide layer is extremely thin, typically around 2\u20133 nanometers, and its thickness is not uniform across the surface. In humid environments, salt exposure, or chemically aggressive conditions, this passive layer degrades quickly.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>For outdoor assemblies or marine applications, relying solely on the natural oxide film usually creates long-term corrosion risk.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Extrusion Lines and Roller Marks<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Mill finish surfaces retain visible evidence of the primary forming process.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><a href=\"https:\/\/shengenfab.com\/ko\/aluminum-extrusion\/\" target=\"_blank\" rel=\"noopener\">Extruded components<\/a> commonly show:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li><strong>Longitudinal die lines<\/strong><\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Flow streaks<\/strong><\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Mechanical drag marks<\/strong><\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Handling scratches<\/strong><\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>Rolled sheet products typically show:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li><strong>Roller patterns<\/strong><\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Coil handling marks<\/strong><\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Minor surface waviness<\/strong><\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>These conditions are standard manufacturing artifacts. They are not considered defects unless the print explicitly defines cosmetic surface requirements.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">\ud45c\uba74 \uac70\uce60\uae30<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Surface texture varies significantly depending on the manufacturing route and alloy condition.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>Typical examples include:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li><strong>Extruded profiles:<\/strong> Ra approximately 1.6\u20133.2 \u00b5m<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Cold-rolled sheet:<\/strong> substantially smoother baseline finish<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Cast aluminium surfaces:<\/strong> generally rougher and less uniform<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>This roughness directly affects downstream operations such as:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>Powder coating adhesion<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Paint wet-out<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Adhesive bonding<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Silk-screen printing<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Mechanical polishing time<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>Rougher mill finish surfaces usually require additional sanding, bead blasting, or chemical pretreatment before secondary finishing operations.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Batch-to-Batch Appearance Variation<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Mill finish aluminium should never be specified where strict visual consistency is required. Because there is no final surface normalization process, variations between mill lots are common. Differences typically include:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>Gloss level shifts<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Slight tonal variation<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Uneven reflectivity<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Localized surface dullness<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>These changes become especially visible under inspection lighting or across large assembled panels.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>For cosmetic housings or architectural visible surfaces, this variation often creates unnecessary quality disputes during incoming inspection and final assembly approval.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading --><\/p>\n<h2 class=\"wp-block-heading\">Functional Advantages of Raw Aluminium Surfaces<\/h2>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>In many applications, engineers intentionally specify bare aluminium because the untreated surface provides measurable functional advantages.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">\uc804\uae30 \uc804\ub3c4\ub3c4<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Anodized aluminium creates a dielectric barrier that increases electrical resistance at contact points. Mill finish aluminium maintains direct metal-to-metal conductivity, which is important for:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>Grounding brackets<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Busbars<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>EMI shielding components<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Chassis grounding paths<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Conductive mounting structures<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>For low-resistance electrical interfaces, untreated aluminium often eliminates the need for secondary masking operations before anodizing.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Thermal Transfer<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Surface coatings introduce additional thermal resistance.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>Keeping the aluminium bare minimizes thermal impedance between the heat source and the surrounding structure. This is beneficial for:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>\ubc29\uc5f4\ud310<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Thermal spreaders<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>LED mounting plates<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Power electronics housings<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Internal cooling structures<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>In thermal management assemblies, even thin coating layers can reduce heat dissipation efficiency.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Tolerance Stability<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Secondary finishing processes change part dimensions.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>Examples include:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li><strong><a href=\"https:\/\/shengenfab.com\/ko\/hard-coat-anodizing\/\" target=\"_blank\" rel=\"noopener\">\ud558\ub4dc \uc544\ub178\ub2e4\uc774\uc9d5<\/a>:<\/strong> dimensional growth into and out of the surface<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong><a href=\"https:\/\/shengenfab.com\/ko\/what-is-anodized-aluminum\/\" target=\"_blank\" rel=\"noopener\">\ubd84\uccb4 \ub3c4\uc7a5<\/a>:<\/strong> uneven buildup typically around 50\u2013150 \u00b5m<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>Wet paint:<\/strong> localized thickness variation at edges and corners<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>For precision assemblies, these coating layers can create:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>Press-fit interference<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Thread engagement issues<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>\uacf5\ucc28 \ub204\uc801<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Assembly misalignment<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>Mill finish aluminium preserves the machined or extruded dimensions directly from production.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>This is particularly important for:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li>Precision locating features<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Tight-clearance mechanical assemblies<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Sliding interfaces<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li>Thermal contact surfaces<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Alloy Behavior in the Mill State<\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Bare aluminium performance depends heavily on alloy chemistry. Without protective coatings, alloy selection becomes critical for corrosion resistance and environmental durability.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>\uc608\uc2dc:<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\"><!-- wp:list-item -->\n<li><strong>5052 aluminium<\/strong> contains magnesium and offers strong natural corrosion resistance in humid or marine environments.<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>6061 aluminium<\/strong> provides balanced machinability and moderate corrosion resistance for general industrial applications.<\/li>\n<!-- \/wp:list-item --><!-- wp:list-item -->\n<li><strong>7075 aluminium<\/strong> contains significant copper content and is substantially more vulnerable to oxidation and pitting when left untreated.<\/li>\n<!-- \/wp:list-item --><\/ul>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p>Selecting mill finish 7075 for outdoor use without additional protection commonly leads to premature surface degradation.<\/p>\n<p><!-- \/wp:paragraph --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f04db4 elementor-widget elementor-widget-image\" data-id=\"4f04db4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"700\" height=\"391\" src=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Mill-Finish-Aluminium.jpg\" class=\"attachment-large size-large wp-image-24769\" alt=\"\ubc00 \ub9c8\uac10 \uc54c\ub8e8\ubbf8\ub284\" srcset=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Mill-Finish-Aluminium.jpg 700w, https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Mill-Finish-Aluminium-300x168.jpg 300w, https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Mill-Finish-Aluminium-18x10.jpg 18w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a5db130 elementor-widget elementor-widget-text-editor\" data-id=\"a5db130\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">Manufacturing Challenges of Mill Finish Aluminium<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium removes secondary finishing costs, but it does not eliminate process control requirements. In practice, it shifts more responsibility onto fabrication, assembly, packaging, and quality teams.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Welding Preparation<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>The natural aluminium oxide layer (Al2\u200bO3\u200b) creates a major welding challenge. Aluminium oxide melts at approximately 2050\u00b0C, while the base aluminium alloy melts near 660\u00b0C. During TIG or MIG welding, the oxide layer remains solid long after the parent material begins to liquefy.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>If the oxide is not removed before welding, it becomes trapped inside the weld pool and creates:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li><strong>\ub2e4\uacf5\uc131<\/strong><\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>Slag inclusions<\/strong><\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>Lack of fusion<\/strong><\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>Reduced weld strength<\/strong><\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Proper weld preparation typically requires:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Stainless steel wire brushing<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Abrasive grinding<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Chemical etching<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Solvent degreasing immediately before welding<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p><strong>Shop-floor reality:<\/strong> Aluminium surfaces begin re-oxidizing within minutes after cleaning. Welding preparation and welding operations should occur as close together as possible.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Surface Cleaning Before Coating<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium arriving from extrusion or machining operations is rarely clean enough for direct coating.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>The surface normally contains:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Extrusion lubricants<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Stamping oils<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>CNC coolant residue<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Fingerprints and handling contamination<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Embedded metallic fines<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Applying paint or powder coating directly onto contaminated aluminium almost guarantees adhesion problems.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Most production lines use a multi-stage pretreatment process that includes:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list {\"ordered\":true} --><\/p><ol class=\"wp-block-list\"><!-- wp:list-item --><li>Alkaline degreasing<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Water rinse<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Acid deoxidation (desmutting)<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Conversion coating or chemical pretreatment<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Final rinse and drying<\/li><!-- \/wp:list-item --><\/ol><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Skipping the deoxidation stage often leaves unstable oxide patches beneath the coating system.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Coating Adhesion Failures<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Poor pretreatment usually does not appear immediately. Most failures show up during final inspection or field use.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Residual oils and unstable oxide layers create a microscopic separation barrier between the coating and substrate. This weak interface leads to:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Edge lifting<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Flaking<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>\ubb3c\uc9d1\uc774 \uc0dd\uae30\ub2e4<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Delamination<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>These failures become obvious during ASTM D3359 cross-hatch adhesion testing, where the coating separates from the base metal instead of remaining bonded.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Dimensional Change After Finishing<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>One common production mistake is validating prototypes in mill finish and later switching production parts to anodized or powder-coated surfaces without re-evaluating tolerances.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Surface treatments change part dimensions.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Typical buildup includes:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li><strong>Hard anodizing:<\/strong> dimensional growth up to approximately 50 \u00b5m<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>Powder coating:<\/strong> coating thickness commonly between 100\u2013150 \u00b5m<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>Wet paint:<\/strong> variable edge buildup and corner pooling<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>These changes directly affect:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Press-fit assemblies<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Thread engagement<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Sliding clearances<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Bearing seats<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Mating features<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>If the CAD model and machining tolerances were developed around bare aluminium dimensions, coated production parts may fail assembly even though the machining process itself remains within tolerance.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">White Rust During Shipping<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium is highly vulnerable during sea freight and long-term storage. Temperature cycling inside shipping containers generates condensation, commonly called container rain. Moisture collects on the bare aluminium surface and remains trapped for extended periods.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>In humid or salt-heavy environments, this exposure causes rapid surface oxidation and pitting commonly referred to as white rust.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Typical damage includes:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Chalky white oxidation<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Surface staining<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Localized pitting<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Etched surface texture<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>This corrosion permanently changes the surface condition and often causes cosmetic rejection during incoming inspection.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">VCI Packaging and Storage Control<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium requires controlled packaging conditions during storage and transportation.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Most manufacturers use:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>VCI (Volatile Corrosion Inhibitor) bags<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Industrial desiccants<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Sealed packaging systems<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Moisture-barrier wrapping<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Direct contact with raw wood pallets should be avoided whenever possible.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Wood contains:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Moisture<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Organic acids<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Resin compounds<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>These contaminants can chemically stain or etch bare aluminium surfaces during long-term storage. For export shipments, improper packaging frequently causes more damage than the machining process itself.<\/p><p><!-- \/wp:paragraph --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f78b31c elementor-widget elementor-widget-image\" data-id=\"f78b31c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"700\" height=\"391\" src=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Preventing-White-Rust-During-Shipping-and-Storage.jpg\" class=\"attachment-large size-large wp-image-24768\" alt=\"Preventing White Rust During Shipping and Storage\" srcset=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Preventing-White-Rust-During-Shipping-and-Storage.jpg 700w, https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Preventing-White-Rust-During-Shipping-and-Storage-300x168.jpg 300w, https:\/\/shengenfab.com\/wp-content\/uploads\/2024\/01\/Preventing-White-Rust-During-Shipping-and-Storage-18x10.jpg 18w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0038219 elementor-widget elementor-widget-text-editor\" data-id=\"0038219\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">How Engineers Define Mill Finish Surface Requirements?<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>The largest source of conflict with mill finish aluminium is usually not manufacturing capability. It is unclear expectation management between the customer and supplier. Because mill finish is inherently variable, engineering teams must define acceptable surface conditions directly on the manufacturing drawing.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Cosmetic vs Non-Cosmetic Surfaces<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Separating cosmetic and non-cosmetic areas is one of the most effective ways to reduce unnecessary scrap.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Engineering drawings should clearly identify:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li><strong>A-surfaces:<\/strong> visible cosmetic areas<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>B\/C-surfaces:<\/strong> hidden or functional areas<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>This distinction allows manufacturers to accept:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Minor die lines<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Clamp marks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Roller marks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Handling scratches<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>on non-visible surfaces without triggering rejection. Without this separation, suppliers often over-process the entire component, increasing cost and lead time.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Scratch Acceptance Standards<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Statements like \u201cscratch-free surface\u201d are not measurable manufacturing standards.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Professional inspection criteria define:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Inspection distance<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Lighting conditions<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Viewing angle<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Inspection duration<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>A common industrial standard specifies:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Fluorescent lighting<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Approximately 18-inch viewing distance<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>3\u20135 second inspection time<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>If a mark cannot be easily identified under those conditions, the surface is generally considered acceptable. This approach prevents subjective quality disputes between suppliers and incoming inspection teams.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Surface Finish Notes on Drawings<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>General notes such as \u201cclean finish\u201d or \u201cgood appearance\u201d create interpretation problems. Engineering drawings should define measurable surface requirements using standards such as:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li><strong>ASME Y14.36<\/strong><\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li><strong>ISO 1302<\/strong><\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Important variables include:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Surface roughness (Ra)<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Cosmetic zone definitions<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Permissible tooling marks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Oxidation acceptance<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Scratch limitations<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p><strong>Example drawing note:<\/strong><\/p><p><!-- \/wp:paragraph --> <!-- wp:quote --><\/p><blockquote class=\"wp-block-quote\"><!-- wp:paragraph --><p>Part supplied in mill finish condition. Light tooling marks permitted. Surface roughness Ra \u2264 3.2 \u00b5m unless otherwise specified. No heavy scratches allowed on cosmetic surfaces.<\/p><!-- \/wp:paragraph --><\/blockquote><p><!-- \/wp:quote --> <!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">Supplier Inspection Alignment<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Drawings alone rarely eliminate cosmetic disputes. Before mass production begins, experienced procurement and quality teams normally approve:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>\u314f <strong>Golden Sample<\/strong><\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>\u314f <strong>Boundary Sample<\/strong><\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>The Golden Sample represents the target appearance. The Boundary Sample represents the worst acceptable condition still considered passable. This physical reference standard reduces subjective interpretation during incoming inspection and supplier audits.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">Mill Finish vs Anodized vs Powder Coated Aluminium<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Selecting a finish is not a cosmetic afterthought; it is a fundamental engineering decision that dictates part lifespan, electrical performance, and unit economics. Each finish changes the part\u2019s production behavior and long-term field performance.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">\ud45c\uba74 \uc678\uad00<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium retains visible manufacturing history, including:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Extrusion lines<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Roller marks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Machining patterns<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Surface dullness variation<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Anodizing creates a more uniform metallic appearance by chemically modifying the aluminium surface itself. Powder coating completely hides the base metal beneath a cured polymer layer.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">\ubd80\uc2dd \uc800\ud56d<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium depends entirely on its thin natural oxide layer for protection. This layer performs poorly in:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>\ud574\uc548 \ud658\uacbd<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Industrial chemical exposure<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>High humidity<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Salt spray conditions<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Anodizing thickens and stabilizes the oxide layer, creating a harder and more corrosion-resistant surface. Powder coating isolates the aluminium from the surrounding environment, but deep scratches can expose the substrate and create localized corrosion points.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Electrical Insulation<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium remains electrically conductive and is often preferred for:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Grounding paths<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>EMI shielding<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Electrical chassis systems<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Anodized surfaces behave as electrical insulators unless contact points are machined back to bare metal. Powder coating completely blocks electrical conductivity because the coating acts as a non-conductive polymer barrier.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Manufacturing Cost and Lead Time<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium removes secondary finishing operations entirely.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>This reduces:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Outside processing cost<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Packaging cycles<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Transportation between vendors<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Queue time at anodizing or coating suppliers<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>In many production programs, eliminating secondary finishing reduces lead time by approximately 3\u20137 days and lowers overall part cost by 15\u201330%, depending on geometry, quantity, and coating specification. However, these savings only hold if the application can tolerate the functional limitations of bare aluminium.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">Where Mill Finish Aluminium Works Best\uff1f<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Specifying mill finish aluminium is a functional engineering decision. When appearance is secondary to mechanical performance, stripping away surface treatments is the most efficient way to optimize a bill of materials (BOM).<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Non-Cosmetic Components<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Applying anodizing or powder coating to hidden structural parts often adds unnecessary manufacturing cost.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium is commonly used for:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Internal chassis structures<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Hidden mounting brackets<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Machine frames<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Electrical enclosure supports<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Enclosed industrial assemblies<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>In dry and controlled operating environments, the natural oxide layer generally provides adequate baseline protection for non-visible components.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Removing secondary finishing operations also reduces:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Outside vendor processing<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Packaging cycles<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Cosmetic inspection requirements<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Production queue time<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>For high-volume sheet metal assemblies, limiting cosmetic finishing to visible A-surfaces can significantly reduce scrap and rework rates.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">High-Conductivity Applications<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Surface coatings create electrical and thermal barriers. Mill finish aluminium maintains direct metal-to-metal conductivity because there is no anodized dielectric layer or polymer coating between contact surfaces.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>This makes raw aluminium suitable for:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Electrical busbars<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Grounding straps<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>EMI shielding components<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>\ubc29\uc5f4\ud310<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Thermal spreaders<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Power distribution structures<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>For thermal management systems, eliminating thick surface coatings reduces thermal impedance and improves heat transfer efficiency between mating components.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">\uc815\ubc00 \uac00\uacf5 \ubd80\ud488<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Tight-tolerance machined assemblies are highly sensitive to coating buildup. Mill finish aluminium preserves the final dimensions produced during <a href=\"https:\/\/shengenfab.com\/ko\/cnc-machining-a-guide\/\" target=\"_blank\" rel=\"noopener\">CNC \uac00\uacf5<\/a>, <a href=\"https:\/\/shengenfab.com\/ko\/what-is-cnc-turning\/\" target=\"_blank\" rel=\"noopener\">\uc120\ud68c<\/a>, or grinding operations. This is critical for assemblies requiring:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>H7\/g6 fits<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Bearing press fits<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Sliding tracks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Precision locating surfaces<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Threaded interfaces<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Dowel alignment features<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Anodizing and powder coating can introduce:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Hole size reduction<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Edge buildup<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Uneven coating thickness<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Thread interference<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Fitment instability<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Keeping the part in mill finish condition removes one variable from tolerance stack-up analysis and simplifies assembly validation.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Low-Cost Prototype Builds<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Prototype programs prioritize iteration speed over cosmetic refinement.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Sending prototype components for anodizing or powder coating typically adds several days of external processing time. During early-stage validation, this delay often slows mechanical development without providing additional engineering value.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Mill finish prototypes allow teams to quickly evaluate:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Mechanical fit<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Assembly sequence<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Structural behavior<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Thermal performance<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>DFM feasibility<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>This approach is common during:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>\uc2e0\uc18d\ud55c \ud504\ub85c\ud1a0 \ud0c0\uc785<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Fixture validation<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>CNC machining trials<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Early sheet metal development<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Functional enclosure testing<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Once geometry and functionality are finalized, the engineering team can validate final coating specifications separately.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">Where Mill Finish Aluminium Should Not Be Used<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium has clear environmental and cosmetic limitations. Using untreated aluminium in the wrong application often leads to premature corrosion, appearance degradation, or long-term maintenance problems.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Coastal Environments<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Bare aluminium performs poorly in chloride-rich environments. Salt spray gradually penetrates the natural oxide layer and accelerates:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>\ud53c\ud305 \ubd80\uc2dd<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Surface oxidation<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Galvanic attack<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Localized material degradation<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>This issue becomes severe in:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Marine equipment<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Coastal infrastructure<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Outdoor electrical enclosures<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>HVAC systems near seawater<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>For these applications, engineers typically specify:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>\ud558\ub4dc \uc544\ub178\ub2e4\uc774\uc9d5<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Marine-grade powder coating<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Chemical conversion coatings<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Alloy selection also matters. For example, untreated 5052 aluminium provides substantially better corrosion resistance than 7075 in marine environments.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Decorative Products<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Mill finish aluminium cannot deliver stable cosmetic consistency across production batches.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>The raw surface retains visible process artifacts such as:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Extrusion lines<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Roller marks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Surface waviness<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Gloss variation<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Handling scratches<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Because there is no secondary surface leveling process, batch-to-batch visual matching is inherently inconsistent.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>This creates problems for:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Decorative housings<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Retail display systems<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>\uac74\ucd95 \ud2b8\ub9bc<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Consumer-facing products<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>If the product requires controlled gloss, uniform color, or a consistent A-surface finish, anodizing or powder coating is typically required.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">\uac00\uc804<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Bare aluminium surfaces degrade quickly during daily handling.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Without secondary finishing, the surface:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Scratches easily<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Retains fingerprint oils<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Shows abrasion marks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Collects dirt contamination<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>For handheld or consumer-facing products, untreated aluminium usually feels unfinished compared to bead-blasted and anodized surfaces.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Most consumer electronics manufacturers use:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>\ube44\ub4dc \ube14\ub77c\uc2a4\ud305<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Fine brushing<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Clear anodizing<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>\ud558\ub4dc \uc544\ub178\ub2e4\uc774\uc9d5<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>to improve both tactile feel and surface durability.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading {\"level\":3} --><\/p><h3 class=\"wp-block-heading\">Public-Facing Structures<\/h3><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>Outdoor exposure gradually damages untreated aluminium surfaces even when structural integrity remains acceptable. Over time, mill finish aluminium exposed to weather develops:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Chalky oxidation streaks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Uneven discoloration<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Water staining<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Pollutant-related surface etching<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>These conditions are common on:<\/p><p><!-- \/wp:paragraph --> <!-- wp:list --><\/p><ul class=\"wp-block-list\"><!-- wp:list-item --><li>Architectural panels<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Outdoor kiosks<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Public equipment housings<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Transit infrastructure<\/li><!-- \/wp:list-item --> <!-- wp:list-item --><li>Exterior framing systems<\/li><!-- \/wp:list-item --><\/ul><p><!-- \/wp:list --> <!-- wp:paragraph --><\/p><p>Although the aluminium itself may remain structurally sound, long-term appearance degradation often increases maintenance and replacement costs.<\/p><p><!-- \/wp:paragraph --> <!-- wp:heading --><\/p><h2 class=\"wp-block-heading\">\uacb0\ub860<\/h2><p><!-- \/wp:heading --> <!-- wp:paragraph --><\/p><p>On the production floor, surface finish selection should follow functional requirements rather than cosmetic assumptions. Mill finish aluminium is not a lower-grade material condition. It is a function-driven manufacturing specification that works best when the engineering team fully understands its environmental limits and handling requirements.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>With over 10 years of industrial experience in sheet metal fabrication, rapid prototyping, and CNC machining, the engineering team at Shengen knows how materials behave on the actual shop floor. We catch DFM risks, tolerance conflicts, and coating issues long before the first chips fall.<\/p><p><!-- \/wp:paragraph --> <!-- wp:paragraph --><\/p><p>Whether you need cost-effective mill finish internal brackets or high-precision parts ready for mass production, we provide the honest feedback and strict quality control your project demands. <a href=\"https:\/\/shengenfab.com\/ko\/contact\/\" target=\"_blank\" rel=\"noopener\">Upload Your CAD &amp; 2D Drawings for a Free DFM Review<\/a>.<\/p><p><!-- \/wp:paragraph --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-585b584a\" data-id=\"585b584a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bf8435b elementor-widget elementor-widget-heading\" data-id=\"bf8435b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">\uc548\ub155\ud558\uc138\uc694, \uc800\ub294 \ucf00\ube48 \ub9ac\uc785\ub2c8\ub2e4<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-464d7c47 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"464d7c47\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"640\" src=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2023\/12\/Kevin-Lee.webp\" class=\"attachment-large size-large wp-image-6422\" alt=\"\ucf00\ube48 \ub9ac\" srcset=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2023\/12\/Kevin-Lee.webp 1024w, https:\/\/shengenfab.com\/wp-content\/uploads\/2023\/12\/Kevin-Lee-300x240.webp 300w, https:\/\/shengenfab.com\/wp-content\/uploads\/2023\/12\/Kevin-Lee-768x614.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7211991c elementor-widget elementor-widget-text-editor\" data-id=\"7211991c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u00a0<\/p><p>\uc9c0\ub09c 10\ub144 \ub3d9\uc548 \uc800\ub294 \ub2e4\uc591\ud55c \ud615\ud0dc\uc758 \ud310\uae08 \uc81c\uc791\uc5d0 \ubab0\ub450\ud574 \uc654\uc73c\uba70 \ub2e4\uc591\ud55c \uc6cc\ud06c\uc20d\uc5d0\uc11c \uc5bb\uc740 \uacbd\ud5d8\uc5d0\uc11c \uc5bb\uc740 \uba4b\uc9c4 \ud1b5\ucc30\ub825\uc744 \uc774\uacf3\uc5d0\uc11c \uacf5\uc720\ud588\uc2b5\ub2c8\ub2e4.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-75f04ca5 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"75f04ca5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/shengenfab.com\/ko\/about-author\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">\ub098\uc5d0 \ub300\ud574\uc11c<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5742e3a8 elementor-widget elementor-widget-heading\" data-id=\"5742e3a8\" data-element_type=\"widget\" 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\/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-28e218bf\" data-id=\"28e218bf\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-50709214 elementor-widget elementor-widget-heading\" data-id=\"50709214\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">\ucf00\ube48 \ub9ac<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c866cb1 elementor-widget elementor-widget-text-editor\" data-id=\"2c866cb1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\uc800\ub294 \ub808\uc774\uc800 \uc808\ub2e8, \uad7d\ud798, \uc6a9\uc811 \ubc0f \ud45c\uba74 \ucc98\ub9ac \uae30\uc220\uc744 \uc804\ubb38\uc73c\ub85c \ud558\ub294 \ud310\uae08 \uc81c\uc870 \ubd84\uc57c\uc5d0\uc11c 10\ub144 \uc774\uc0c1\uc758 \uc804\ubb38 \uacbd\ud5d8\uc744 \uac16\uace0 \uc788\uc2b5\ub2c8\ub2e4. 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elementor-section-height-default\" data-id=\"14c34f6c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-78901061\" data-id=\"78901061\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-69efe6d0 elementor-widget elementor-widget-heading\" data-id=\"69efe6d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\uad00\ub828 \uc790\ub8cc<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37b06738 uael-post__link-complete-yes uael-equal__height-yes elementor-widget elementor-widget-uael-posts\" data-id=\"37b06738\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;classic_slides_to_show&quot;:4,&quot;classic_slides_to_show_tablet&quot;:2,&quot;classic_slides_to_show_mobile&quot;:1,&quot;classic_pagination_type&quot;:&quot;ajax&quot;,&quot;classic_show_filters&quot;:&quot;no&quot;}\" data-widget_type=\"uael-posts.classic\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"uael-post__header\">\n\t\t\t\t\t<\/div>\n\t\t<div class=\"uael-post__body\">\n\t\t\t\n\t\t\n\t\t<div class=\"uael-blog-terms-position- uael-post-image-top uael-post-grid uael-posts\" data-query-type=\"custom\" data-structure=\"normal\" data-layout=\"\" data-page=\"7129\" data-skin=\"classic\" data-filter-default=\"\" data-offset-top=\"30\" >\n\n\t\t\t\t\t\t\t<div class=\"uael-post-grid__inner uael-post__columns-4 uael-post__columns-tablet-2 uael-post__columns-mobile-1\">\n\t\t\t\n<div 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uael-bg-wrap-disabled\">\n\n\t\t\t\t\t<a href=\"https:\/\/shengenfab.com\/ko\/fingerprint-resistant-stainless-steel\/\" target=\"_self\" class=\"uael-post__complete-box-overlay\" aria-label=\"\ub9c1\ud06c \uc644\ub8cc \uc0c1\uc790\"><\/a>\n\t\t\t\t\n\t\t<div class=\"uael-post__inner-wrap uael-inner-wrap-disabled\">\n\n\t\t\t\t<div class=\"uael-post__thumbnail\">\n\t\t\t\n\t\t\t<a href=\"https:\/\/shengenfab.com\/ko\/fingerprint-resistant-stainless-steel\/\" target=\"_blank\" title=\"\uc9c0\ubb38 \ubc29\uc9c0 \uc2a4\ud14c\uc778\ub9ac\uc2a4 \uc2a4\ud2f8: \uc791\ub3d9 \uc6d0\ub9ac \ubc0f \uc120\ud0dd \ubc29\ubc95\"><img loading=\"lazy\" decoding=\"async\" width=\"750\" height=\"409\" src=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/03\/Why-Surface-Appearance-Changes-Product-Perception-1.jpg\" class=\"attachment-full size-full wp-image-24454\" alt=\"\ud45c\uba74 \uc678\uad00\uc774 \uc81c\ud488 \uc778\uc2dd\uc744 \ubc14\uafb8\ub294 \uc774\uc720\" 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\uc548\uc804\ud55c \uc0dd\uc0b0\uc744 \uc758\ubbf8\ud558\ub294 \uac83\uc740 \uc544\ub2d9\ub2c8\ub2e4.\" srcset=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/03\/A-Finished-Drawing-Does-Not-Always-Mean-a-Production-Safe-Job.jpg 750w, https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/03\/A-Finished-Drawing-Does-Not-Always-Mean-a-Production-Safe-Job-300x164.jpg 300w, https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/03\/A-Finished-Drawing-Does-Not-Always-Mean-a-Production-Safe-Job-18x10.jpg 18w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/a>\n\t\t\t\t\t<\/div>\n\t\t\n\t\t\t\n\t\t\t<div class=\"uael-post__content-wrap uael-content-wrap-disabled\">\n\t\t\t\t\t<h3 class=\"uael-post__title\">\n\n\t\t\n\t\t\t\t\t\t<a href=\"https:\/\/shengenfab.com\/ko\/oem-vs-contract-manufacturing\/\" target=\"_blank\">\n\t\t\t\tOEM\uacfc \uacc4\uc57d \uc81c\uc870: \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc801\ud569\ud55c \ubaa8\ub378\uc744 \uc120\ud0dd\ud558\ub294 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2.3-2.8 5.7-1.5 8.7S4.8 352 8 352c36.6 0 66.9-12.3 88.7-25 32.2 15.7 70.3 25 111.3 25 114.9 0 208-71.6 208-160zm122 220c23.9-26 38-57.7 38-92 0-66.9-53.5-124.2-129.3-148.1.9 6.6 1.3 13.3 1.3 20.1 0 105.9-107.7 192-240 192-10.8 0-21.3-.8-31.7-1.9C207.8 439.6 281.8 480 368 480c41 0 79.1-9.2 111.3-25 21.8 12.7 52.1 25 88.7 25 3.2 0 6.1-1.9 7.3-4.8 1.3-2.9.7-6.3-1.5-8.7-.3-.3-22.4-24.2-35.8-54.5z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\ub313\uae00 \uc5c6\uc74c\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<a class=\"uael-post__read-more elementor-button\" href=\"https:\/\/shengenfab.com\/ko\/oem-vs-contract-manufacturing\/\" target=\"_blank\" aria-labelledby=\"uael-post-24369\">\n\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-icon elementor-align-icon-left\">\n\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-button-text\" 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src=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/02\/Setup-Cost-vs-Unit-Cost.jpg\" class=\"attachment-full size-full wp-image-24239\" alt=\"\uc124\uce58 \ube44\uc6a9\uacfc \ub2e8\uac00 \ube44\uad50\" srcset=\"https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/02\/Setup-Cost-vs-Unit-Cost.jpg 750w, https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/02\/Setup-Cost-vs-Unit-Cost-300x200.jpg 300w, https:\/\/shengenfab.com\/wp-content\/uploads\/2026\/02\/Setup-Cost-vs-Unit-Cost-18x12.jpg 18w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/a>\n\t\t\t\t\t<\/div>\n\t\t\n\t\t\t\n\t\t\t<div class=\"uael-post__content-wrap uael-content-wrap-disabled\">\n\t\t\t\t\t<h3 class=\"uael-post__title\">\n\n\t\t\n\t\t\t\t\t\t<a href=\"https:\/\/shengenfab.com\/ko\/setup-cost-vs-unit-cost-in-sheet-metal-manufacturing\/\" target=\"_blank\">\n\t\t\t\t\ud310\uae08 \uc81c\uc870\uc758 \uc124\uce58 \ube44\uc6a9\uacfc \ub2e8\uac00 \ube44\uad50\t\t\t<\/a>\n\n\t\t\t\t<\/h3>\n\t\t\t\t\t<div class=\"uael-post__meta-data\">\n\t\t\t\t\t<span class=\"uael-post__date\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fa-calendar\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M12 192h424c6.6 0 12 5.4 12 12v260c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V204c0-6.6 5.4-12 12-12zm436-44v-36c0-26.5-21.5-48-48-48h-48V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H160V12c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v52H48C21.5 64 0 85.5 0 112v36c0 6.6 5.4 12 12 12h424c6.6 0 12-5.4 12-12z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\n\t\t\t6 2\uc6d4 2026\t\t<\/span>\n\t\t\t\t<span class=\"uael-post__comments\">\n\t\t\t\t\t\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fa-comments\" viewbox=\"0 0 576 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 192c0-88.4-93.1-160-208-160S0 103.6 0 192c0 34.3 14.1 65.9 38 92-13.4 30.2-35.5 54.2-35.8 54.5-2.2 2.3-2.8 5.7-1.5 8.7S4.8 352 8 352c36.6 0 66.9-12.3 88.7-25 32.2 15.7 70.3 25 111.3 25 114.9 0 208-71.6 208-160zm122 220c23.9-26 38-57.7 38-92 0-66.9-53.5-124.2-129.3-148.1.9 6.6 1.3 13.3 1.3 20.1 0 105.9-107.7 192-240 192-10.8 0-21.3-.8-31.7-1.9C207.8 439.6 281.8 480 368 480c41 0 79.1-9.2 111.3-25 21.8 12.7 52.1 25 88.7 25 3.2 0 6.1-1.9 7.3-4.8 1.3-2.9.7-6.3-1.5-8.7-.3-.3-22.4-24.2-35.8-54.5z\"><\/path><\/svg>\t\t\t\t\t\t\t\t\t\t\ub313\uae00 \uc5c6\uc74c\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t\t<a class=\"uael-post__read-more elementor-button\" href=\"https:\/\/shengenfab.com\/ko\/setup-cost-vs-unit-cost-in-sheet-metal-manufacturing\/\" target=\"_blank\" aria-labelledby=\"uael-post-24235\">\n\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-icon elementor-align-icon-left\">\n\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-button-text\" id=\"uael-post-24235\">\uc790\uc138\ud788\ubcf4\uae30<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\n\t<\/div>\n\n<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\n\t\t<\/div>\n\n\t\t\t\t\t\t<\/div>\n\t\t<div class=\"uael-post__footer\">\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Mill finish aluminum is the raw, untreated metal directly from the extrusion or rolling process. It features a natural, matte, or semi-bright appearance with visible manufacturing lines. This cost-effective, functional finish is ideal for industrial components, structural framing, and hidden parts where durability and economy outweigh aesthetic perfection.<\/p>","protected":false},"author":1,"featured_media":7138,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[21],"class_list":["post-7129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-surface-finish"],"_links":{"self":[{"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/posts\/7129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/comments?post=7129"}],"version-history":[{"count":0,"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/posts\/7129\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/media\/7138"}],"wp:attachment":[{"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/media?parent=7129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/categories?post=7129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/shengenfab.com\/ko\/wp-json\/wp\/v2\/tags?post=7129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}