Phosphating (also phosphatization) is a chemical process in which coatings are generated on a pure metal (normally steel) surface. Coatings generated by phosphating are electrically non-conductive and therefore reduce the corrosion current value. providing good corrosion protection of metal parts. …

What is black phosphate coating?

Phosphate coating is the crystalline coating applied on the ferrous metals to inhibit corrosion. The phosphate coating lends a gray to black appearance of the surface. … The phosphate coating lends a gray to black appearance of the surface.

Is black oxide the same as phosphate?

Phosphate runs at roughly 180 degrees F while black oxide runs at 290F. Both processes have similar pre-treatment steps. Black oxide gives a deep black color while phosphate coatings are grayish. Black oxide is more abrasion resistant than phosphate.