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

5.1.4.8 Tin. Surfaces of tin plate that are to be painted shall be cleaned by vapor degreasing (finish 4.10), or as otherwise specified. Hot-dipped tin plate needs no other pretreatment. Tin plate, electrodeposited from an alkaline stannate bath shall be treated according to finish 11.2. The design/procuring activity shall reference the method of cleaning and the pretreatment on drawings, in contracts or in item specification by the number shown in tables IV and XI.

TABLE XI. Surface treatments for tin plate. Finish No. Requirements

11.1 Discontinued: Specify cleaning by finish number in table IV

11.2 Acid etch. Immerse for 5 minutes in hot [160 - 1800 F (71 - 82 0 C)] aqueous solution maintained at pH 2 to pH 3 by the addition of a solution containing equal parts by weight of phosphoric acid and chromic acid.

11.3 Pretreatment coating, use finish 5.2

5.1.4.9 Titanium and Titanium alloys. Surfaces of titanium and titanium alloys shall be cleaned with vapor degreasing (finish 4.10), or as otherwise specified. Caution should be exercised in the use of chlorinated vapor degreasing solvents as they can cause stress corrosion cracking of titanium alloys. Surfaces that are to be painted shall then be sandblasted (finish 4.1). When sandblasting is not feasible, the clean surface shall receive finish 5.2, pretreatment coating. The design/procuring activity shall select the method of cleaning and the pretreatment, and shall reference them on drawings, in contracts, or in item specifications by the numbers shown in

tables IV and XII.

TABLE XII. Surface treatments for titanium and titanium alloys. Finish No. Requirements

12.1 Abrasive blasting, use finish 4.1, by blasting with 80 - 120 mesh aluminum oxide or sand abrasive (primer thickness shall be 1 mil minimum above blast profile)

12.2 Pretreatment coating, use finish 5.2

12.3 Chemical film, chromate, use finish 7.3.1

12.4 Anodic treatment, AMS 2488, Type 2