The BLACK OXIDE process is a chemical conversion coating for metallic substrates. Unlike coatings such as nickel plating or galvanizing, BLACK OXIDE is not a surface deposit and does not alter the dimensional characteristics of the finished part. Instead, it results from a chemical reaction between the iron in the ferrous metal surface and the oxidizing salts present in the treatment solution.
No metal is removed or deposited during the coating process; instead, the substrate undergoes a chemical conversion. The result of this chemical reaction is the formation of black iron oxide (magnetite, Fe₃O₄) on the metal surface.
Corrosion resistance is achieved through the application of oil to the treated surface, which enhances protection and ensures long-term stability.