Precision Plating offers both rack and wired black oxide conversion coatings on steel.
Black oxide is not an electroplating process, but a conversion process, which changes the surface of the steel to a dark blue or black color. The part is then immersed in a water dissipating oil which increases the corrosion resistance. The main benefit of this process is that it does not change the dimensional properties of the part.
If you have any questions about black oxide, feel free to call our London facility for more information.