Iridite Chromate Conversion Coating Finish Mil-C-5541 Specification
Mil-C-5541F, Chemical Films, Chromate " Iridite ", (Aluminum)
Chemical Film coatings are gelatinous films which provide some sort of a barrier medium to retard corrosion on aluminum surfaces and enhance adhesion of subsequent coatings such as paints and primers. Color can vary from colorless to golden - iridescent - brown. Materials conform to Mil-C-81706. Coatings shall be continuous free from powdery areas, breaks, scratches, etc. Sometimes called yellow iridite
No dimensional change are effected with Iridite finishes.
Type I – Compositions containing hexavalent chromium.
Type II – Compositions containing no hexavalent chromium.
Class 1A is used as a corrosion preventative film (unpainted) or to improve adhesion of paint finish systems.
Class 3 is used as a corrosion preventive film for electrical and electronic applications, where low resistance contacts are required.