Chromate conversion coatings come in two primary types: hexavalent chromate and trivalent chromate. Hexavalent chromate, while effective, poses environmental and health concerns due to the presence of hexavalent chromium. Trivalent chromate, a more environmentally friendly alternative, is gaining popularity.

Hexavalent chromate coatings typically produce a gold or iridescent yellow color. Trivalent chromate coatings can vary in color, including clear, iridescent, and olive drab. Some versions are specifically designed to be clear or provide a colorless finish.

Chromate conversion coating and Alodine are related processes, but they are not exactly the same. Alodine is a brand name for a specific type of chromate conversion coating. The term “Alodine” is often used colloquially to refer to chromate conversion coatings in general, but it’s important to note that there are various types and brands of chromate conversion coatings, with Alodine being one of them.