This specification covers the requirements for three types and three classes of mechanically deposited cadmium@ tin-cadmium or zinc coatings on metallic surfaces by impacting (peen plating). Classification: The coatings@ cadmium@ tin-cadmium and zinc shall be of the following types and classes@ as specified (see 6.2.1). Types: Type I - As coated Type II - With supplementary chromate treatment (see 3.2.9 and 6.1.2) Type III - With supplementary phosphate treatment (see 3.2.10)