This specification details the general material performance and paint layering compatibility, for approval of zinc phosphate conversion coatings on purchased parts.

Material Description. This specification encompasses a crystalline zinc phosphate conversion coating for ferrous, Zinc and Aluminum substrates. Zinc phosphate is used for corrosion protection and to promote paint adhesion.

Symbols. Not applicable.

Applicability. This specification applies to zinc phosphate conversion coating materials that are intended for use on purchased parts. These coatings must provide a crystalline, corrosion-resistant, paint adhesion promoting surface to the substrates shown in Table 1