MIL-STD-186 Protective Finishing For Army Missile Weapon SystemsThis standard establishes the minimum requirements for procedures, materials, and systems for cleaning, plating, painting and finishing metals, wood, electronic materials, parts and assemblies for rockets, guided missiles, and components to protect them from deterioration.

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Code No.

Method

101

102

103

104

105

106

107

108

109

110

111

112

113

Cleaning, mechanical or abrasive (TT-C-490, Method I)

Solvent cleaning (TT-C-490, Method II).  The user must use an environmentally friendly solvent per EPA and OSHA regulations and restrictions.

Hot alkaline cleaning (TT-C-490, Method III) Emulsion cleaning (TT-C-490, Method IV)

Phosphoric acid corrosion removing and metal conditioning treatment, for ferrous and non-ferrous metals, slight etch; type shall be delineated on the drawing immediately following the code 105.

Alkaline cleaner for ferrous and non-ferrous alloys, boiling vat or steam cleaning (A-A-59146), nonetch to aluminum.

Immersion cleaning (A-A-59260) (for steel) Electrolytic leaning (A-A-59260) (for  steel) Sand lightly with number 400 grit paper.

Abrade lightly with aluminum wool; immerse for not less than 3 minutes in a solution of equal parts of nitric acid (specific gravity

1.42) and water.  Follow with a water rinse and dry. Magnesium cleaning (SAE AMS-M-3171).

Prepare surfaces for bonding using procedures of Appendix I. Preference for cleaning method where multiple methods are given for a particular surface shall be designated on the drawing immediately following the code number.

Vapor blast clean