Black Oxide Coating Process

To achieve maximal corrosion resistance the black oxide must be impregnated with oil or wax.

Black oxide coating process.

The coating has almost no thickness. It is used to add mild corrosion resistance for appearance and to minimize light reflection. This means that the black oxide is not deposited on the surface of the substrate like nickel or zinc electroplating. The black oxide process is a chemical conversion coating.

Black oxide black oxide coating. Black oxide blackening oxidizing black passivating gun bluing is a type of conversion coating process. Black oxide or blackening is a conversion coating for ferrous materials stainless steel copper and copper based alloys zinc powdered metals and silver solder. A further advantage black oxide has over other coatings is that as a conversion coating there is minimal buildup which can generally be measured in microns.

Instead the black oxide coating is produced by a chemical reaction between the iron on the surface of the ferrous metal and the oxidizing salts present in the black oxide solution. The primary purpose of black oxide coatings is to provide an attractive uniform color to steel or iron parts. The black oxide process. Hot black oxide 285 f mid temperature black oxide 225 255 f room temperature black oxide 65 85 f all of our black oxide processes can be used in house saving finishing costs cutting lead times and increasing productivity and quality.

Metals with a black oxide coating are dimensionally stable and have a matte black appearance. The metal in the part reacts with chemicals used during the surface treatment to create a hard magnetic black iron oxide shell over ferrous alloys. Epi is the only supplier to offer all three black oxide chemical processes for steel. Great for car restorations where you want that factory bla.

This plating must be stripped prior to the black oxide process. Unlike nickel or zinc electroplating the black oxide is not deposited on the surface of the substrate. The black oxide process occurs because a chemical reaction ensues between the surface of the metal part and materials used in the coating. Black oxide should be used for indoor use or limited exposure to corrosive conditions.

Tips and tricks to produce a durable original looking black oxide phosphate plating on used bolts. Black oxide cannot be produced over plated parts zinc nickel chromium cadmium phosphate. The supplementary coating after finish will dictate the final appearance and function of the part.