Chemical film coating is also referred to as Chem Film, Chromate Conversion, Iridite and Alodine. These are essentially
the same process, the application of a chromate conversion coating on aluminum. Chem film coating produces a finish
which:
- protects from corrosion;
- assures good paint adhesion; and
- conducts electricity.
Chem Film provides less corrosion resistance than other finishes such as anodizing, and does not resist
abrasion. The United States military spec for chemical films and chemical film materials for aluminum
alloys is Mil-C-5541E.
