إزالة الغموض عن معالجة المعادن: ما هو طلاء الأكسيد الأسود؟
Black oxide finish, or blackening or oxidizing, is a chemical conversion coating primarily applied to ferrous metals. The process involves treating the metal with an alkaline solution containing oxidizing salts, which reacts with the surface to create a thin layer of black iron oxide (Fe3O4).