Chemical conversion coatings are used as a corrosion preventive film for metal that is left unpainted, improves electrical conductivity, and can improve the adhesion of paint finishes to aluminum and aluminum alloys. This coating is fragile, so often Anodize is preferred for high use areas. Chemical film is also known as chromate, iridite, alodine, and aluminum passivation, and does not add thickness.
Military Specifications: MIL-C-5541E, MIL-DTL-5541F
Class 1a: Gold
- Gold gives superior corrosion resistance than clear or light gold.
Class 1a: Clear
Class 3: Light Gold
- Light Gold provides lower electrical resistance than Gold