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Mil-Spec: MIL-DTL-16232G

Coating for medium and low alloy steels. The phosphate coating will be uniform in texture, evenly deposited and can be grey to black in color. Provides moderate corrosion resistance and prevents wear.

Type Zinc Phosphate

Zinc phosphate base coating.
Thickness: .0002-.0006”

Type Z shall be a minimum of 11 g/m²

ClassComments

1Supplementary preservative treatment or coating, as specified.
2Supplementary treatment with preservative conforming to MIL-PRF-16173, Grade 3 or MIL-PRF-3150.
3No supplementary treatment.
4Chemically converted (may be dyed to color as specified) with no supplementary coating or coating as specified.

Type Manganese Phosphate

Manganese Phosphate Base.
Type M shall be a minimum of 16 grams per square meter (g/m²)
ClassComments

1Supplementary preservative treatment or coating, as specified.
2Supplementary treatment with lubricating oil conforming to MIL-PRF-16173, Grade 3 or MIL-PRF-3150.
3No supplementary treatment.
4Chemically converted (may be dyed to color as specified) with no supplementary coating or coating as specified.

Accelerated corrosion resistance requirement

Coating SystemExposure Time, minimumTypeClassSalt Spray, hours

M11.5
M21.5
M31.5
M424
Z12
Z22
Z32
Z424

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