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DOD-P-16232-F, Heavy Phosphate Coating
A coating for medium and low alloy steels. Gray to black in color. Intended uses:
The "heavy" phosphate coatings covered by
this specification are intended as a base for holding/retaining supplemental coatings which provide the major portion of the corrosion resistance.
Heavy Type Z can be used up to 200º F, to prevent galling in extrusion and deep drawing.
Class 2 is good for corrosion resistance.
Note: This specification lists a type M also
Type Z .0002" Zinc phosphate base coating
Class 1 .0005" Supplementary preservative treatment or coating, as specified.
Class 2 Supplementary treatment with preservative conforming to MIL-C-16173, Grade 3 or MIL-L-3150 as alternate for very small
parts.
Class 3 No supplementary treatment.
Class 4 Chemically converted.
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