Chromate Conversion, also known as chemical film, alodine or iridite, is a chemical immersion process. During the process, aluminum oxide and chromic oxide is produced in accordance with the conversion reaction shown below:
All chromate conversion coatings use chromic acid in the form of its soluble salts. During the process, a thin, gel-like film is produced on the aluminum surface. Chromate is an excellent pre-treatment for paint or adhesives since it greatly enhances the product's ability to form a bond with the aluminum. It is frequently used on electrical and electronic equipment because it provides increased corrosion resistance while remaining electrically conductive.
The films produced by this process vary in color, depending on the aluminum alloy being treated, surface conditions, and the type of chromate. Alpha Metal Finishing currently offers both clear and gold Chromate. Our gold Chromate Conversion process conforms to MIL-C-5541E Class 1A.
Alpha also provides environmentally friendly Trivalent Chromate Process, or TCP.
Note: The cure time for chemical film is 24 hours. Please allow extra time for turnaround on orders in order to ensure quality adhesion.
Contact us for more information on how we can serve your aluminum finishing needs.
Alpha Metal Finishing is located in Dexter, MI, eight miles west of Ann Arbor, Michigan. Map/Directions
Leaders in Custom Anodizing and Chemical Film Services