Black Oxide, sometimes called blackening, is the act of converting the top layer of a ferrous material with a chemical treatment.
Treating fasteners with a black oxide coating not only adds a nice clean black look but can also add a mild layer of corrosion and abrasion resistance.
To achieve the maximum in corrosion resistance, black oxide can either be waxed or oiled to add an extra layer of protection.
The wax coating may dull the color of the treatment but provides the best resistance.
The black oxide treatment is also referred to as gun bluing.
Benefits Of Black Oxide Fastenersblack stainless steel socket set screws Does not significantly change the dimensions of the fasteners as hot dip galvanizing does. A cheaper alternative to other methods of corrosion resistance such as electroplating.