MIL-STD-171 Finishing Of Metal And Wood SurfacesThis standard establishes and updates general finish codes and serves as a general guide to the selection of suitable materials, procedures, and system for cleaning, plating, painting and otherwise finishing of metal and wood surfaces.

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MIL-STD-171F

TABLE V. Surface treatments and finishes for iron and steel. (including corrosion-resisting steel ores)

Finish No. Requirements

Finishes for iron and low-alloy steels

* 5.1 Light phosphate paint base coatings

5.1.1 Zinc phosphate base, TT-C-490, type I

5.1.2 Iron phosphate base, TT-C-490, type II

5.1.3 Zinc phosphate base, TT-C-490, type V

5.1.4 Nano base, TT-C-490, type IV

5.2 Pretreatment coating, TT-C-490, type III (wash primer, MIL-P-8514)

* 5.3 Heavy phosphate coatings

* 5.3.1 Manganese phosphate base MIL-DTL-16232, type M

5.3.1.1 Class 1, supplementary preservative treatment or coating, as specified.

5.3.1.2 Class 2, supplementary treatment with lubricating oil conforming to

MIL-PRF-3150

5.3.1.3 Class 3, with no supplementary treatment

5.3.1.4 Class 4, Chemically converted (may be dyed to color as specified) with no supplementary coating or with supplementary coating as specified

* 5.3.2 Zinc phosphate base, MIL-DTL-16232, type Z

5.3.2.1 Class 1, supplementary preservative treatment or coating, as specified

5.3.2.2 Class 2, supplementary treatment with preservative conforming to

MIL-PRF-16173, grade 3 or MIL-PRF-3150 (as alternate for very small parts)

5.3.2.3 Class 3, with no supplementary treatment

5.3.2.4 Class 4, Chemically converted (may be dyed to color as specified) with no supplementary coating or with supplementary coating as specified

5.3.3 See 5.3.2

5.3.4 Use finish 5.3.2.4

Finishes for corrosion-resisting steels

* 5.4 Corrosion-resisting steel not to be painted

5.4.1 Clean and passivate, AMS 2700 or ASTM A967 (clean ASTM A380)

5.4.2 Discontinued: Use finish 5.4.1

* 5.5 Corrosion-resisting steel to be painted

5.5.1 Cleaning, passivation, and pretreatment coating

Clean and passivate, AMS 2700 or ASTM A967 (clean ASTM A380) Surfaces to be painted shall be treated by blasting with 80 - 120 mesh aluminum oxide or sand abrasive (primer thickness shall be 1 mil minimum above blast profile)

*General finish requirement headings shall not be specified. The specific finish numbers(s) only shall be specified. See page iii for the proper method of specifying finishes.