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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MIL-STD-186F (MI)

5.2.7 Tin. Tin surfaces shall receive a supplementary treatment of organic coating, varnish ASTM-D-3955 or ASTM-D-295, conformal coating, or a paint system to prevent corrosion. Tin surfaces shall be coated with wash primer DOD-P-15328 prior to receiving a paint system.

5.2.8 Wood. Wood surfaces shall be treated with wood preservative conforming to composition A of TT-W-572, applied in accordance with applicable treating methods.

5.3 Metallic coatings. Codes for metallic coatings are enumerated in table III. Metallic coatings shall be applied by electrodeposition, electroless deposition, spray metallized, or vacuum deposited methods in conformance with applicable specifications listed herein. Other processes may be used, subject to approval by

the procuring activity. Necessary process and quality control requirements shall be established and technical data developed which shall be submitted to the procuring activity substantiating that the proposed coatings are equivalent to the coatings they are intended to replace relative to corrosion resistance, wear, and other functional characteristics and effect on static and dynamic properties of the metals and alloys to which they are applied. The surface roughness of the surface to be plated shall be as specified on the applicable drawing. All sharp edges shall be broken and all burrs shall be removed before coating. When applying metallic coatings the following shall be considered:

a. Stress-relief heat treat prior to cleaning and plating.

b. Hydrogen embrittlement relief bake after plating per ASTM B 850.

alloys.

c. Environmentally assisted cracking susceptibility of high strength

5.3.1 Cadmium plating. Cadmium plating shall be in accordance with QQ-P-

416. Supplementary treatments are required to provide corrosion resistance. Cadmium plating shall not be used in the following applications:

fluid

(a) Parts of hydraulic equipment which may be in contact with hydraulic

(b) Parts in frictional contact where gouging or binding may be a factor or where corrosion would interfere with normal functioning