MIL-DTL-5541, AMS 2473, AMS 2474
Chemical conversion coatings form protective coatings by chemical reaction of conversion materials with aluminum and aluminum alloys.
TYPES
TYPE I – Compositions containing hexavalent chromium
Type II – Compositions containing no hexavalent chromium
CLASSES
Class 1A – For maximum protection against corrosion, painted or unpainted.
Class 3 – For protection against corrosion where low electrical resistance is required.