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)

(d)  On exterior exposed fasteners that are not to receive a subsequent paint or sealer coat.

5.3.2  Vacuum deposited cadmium.  Parts which cannot be thoroughly cleaned to insure removal of the plating solution shall be vacuum coated with cadmium in accordance with SAE AMS-C-8837.  Vacuum deposited cadmium shall be used for high hardness (Rockwell C-40 or above) subject to the deleterious effects of hydrogen embrittlement.

5.3.3  Chromium plating.  Chromium plating shall be used for surfaces subject to wear, abrasion or erosion, except when other surface hardening processes are used such as nitriding and carburizing, or where other wear and abrasion resistant coatings are specified.  Chromium plating shall be in accordance with SAE-AMS-

QQ-C-320.

5.3.4  Black chromium plating.  Black chromium plating shall be used where nonreflective, abrasion- or corrosion-resistant surfaces are required.  Black chromium plating shall be in accordance with MIL-DTL-14538.

5.3.5  Porous chromium plate.  Porous chromium plate is another form of engineering chromium.  The process produces etched channels or pores in the surface of the plating to retain miniature pools of lubricating oil.  Porous chromium plate shall be in accordance with MIL-C-20218.

5.3.6  Nickel plating.  Nickel plating shall be used for the following applications:

(a)  Where temperatures do not exceed 537.8°C and other coatings would not be suitable

(b)  To minimize the effects of dissimilar metal contacts, such as mild steel with unplated corrosion-resisting steel or stainless steel in contact with other stainless steel

(c)  As an undercoat for other functional coatings

treatment.

(d)  As a protective finish on metals without further supplementary

Nickel plating of parts and surfaces shall be in accordance with SAE-AMS-QQ-N-

290.

5.3.7  Black nickel plating.  Black nickel plating shall be in accordance with

MIL-P-18317.

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