Chromating

The chromating process (also known as chromate conversion coating) is a chemical treatment used to improve the corrosion resistance, adhesion properties, and durability of metals, particularly aluminum, and its alloys. This process involves the application of a thin, protective layer of chromium-based compounds on the surface of the metal.

Here’s a breakdown of how the chromating process works:

The metal surface is treated with a solution containing chromium (typically hexavalent chromium compounds like chromic acid, sodium dichromate, etc.). The chromium reacts with the metal surface, forming a very thin, transparent, or iridescent coating.