This specification establishes the engineering requirements for producing chemical-film coatings on aluminum alloys and the properties of such coatings. This process has been used typically for increasing the corrosion resistance of aluminum alloy parts, as a base for paint or other organic finishes, and for repair of abraded surfaces or discontinuous anodized coatings on aluminum alloy parts, but usage is not limited to such applications. AMS 2474 should be specified when parts are used in assemblies which have electrical bonding requirements.