Compound layer of iron nitride can be considered as a ceramic layer. It is very wear resistant.(HRC > 62~72, depending on alloying elements included.) This layer prevents metal-to-metal contact and therefore prevents adhesive wear from happening. This white compound layer is also very corrosion resistant, esp. a post-nitriding oxidation is added that turns the color of workpiece into shining black. VW is using nitrocarburizing process on their ball studs, you guys can also give it a try to replace the EVERLUBE coating.
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