metal Chem applies electroplated zinc, a widely applied finish that provides economical corrosion resistance to steel. Today, with higher worldwide demand for improved quality resistance, alternate coatings are required. There are three standard chromates used on top of Zinc. Clear, Yellow and Black. Chromates are used to prevent the Zinc from corroding and for cosmetic purposes.
Zinc plating per ASTM – B-633.85
Type I, II, III, (Clear, Yellow, Black, Olive), AMS 24025