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

4.8 Organic vapor, acid or alkaline environment. Unpainted parts of cadmium or zinc base alloys or metal parts plated with cadmium or zinc shall not be used in unventilated assemblies where formic/acetic acid or other organic vapors emanating from insulating varnishes, encapsulating compounds or uncured plastic material may contact them. Cadmium and zinc or platings of these metals shall not be used where parts are in contact with acid, unsymmetrical dimethylhydrazine, ammonia or vapors thereof.

4.9 Surfaces not to be painted. Surfaces that do not require paint for protection, and other surfaces where the paint may interfere with the function. The following are examples of surfaces that should be masked or otherwise protected during painting:

(a) Machined surfaces that move with respect to each other, such as threads, slides, bearing contacts and gear teeth.

(b) Electrical parts, such as contacts, relays, bearings, insulators, sockets, plugs, connectors, and terminals. This does not preclude the use of conformal coating in accordance with application requirements of MIL-I-46058.

(c) Plastic and rubber parts such as insulators, mounts, spacers, windshields, etc. (d) Lubrication (zerk) fittings, cups, holes, etc.

4.10 Dressing operations. Filing, sanding or other dressing operations shall not be done on a part or assembly after it has been finished, except as permitted by drawings, other specifications, the contract or by written approval of the contracting officer. Where filing or the like is permitted, the affected area shall be refinished in accordance with the finish specified for the part.

4.11 Use of steel wool. Steel wool shall not be used in lieu of emery or garnet abrasives to clean aluminum, magnesium alloys or stainless steel surfaces unless adequate precautions

are taken to remove embedded steel contaminates.

4.12 Welding, soldering, and brazing. Unless otherwise specified, welding, soldering and brazing shall not be permitted on an assembly after it has been finished with organic coatings. This restriction does not apply if the finish is SSPC-Paint30, Weld through Inorganic Zinc Primer, finish 24.1.