CHROMATE CONVERSION COATING

Chromate conversion coatings are formed on metallic surfaces as a result of chemical attack that results form the immersion of the workpiece into a bath containing chromic acid, chromium salts and other mineral acids leaving a protective film on the surface. These chromates are most widely applied on plated deposits as well as chromates applied directly to aluminum. The primary purpose of the chromate coating is to provide some form of enhanced corrosion resistance to either the plated deposit or the base material.