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.

Treatment

224

225

226

227

228

229

230

231

232

233

Anodic coating for zinc and zinc alloys.

Apply chromate treatment for brass (MIS-28744).  Class to be designated on drawing immediately following the code number.

Heavy phosphate coating (MIL-DTL-16232, type M, class 1) (Supplementary preservative treatment to be delineated on drawing immediately following the code).

Heavy phosphate coating (MIL-DTL-16232, type M, class 2) (Supplementary treatment with lubricating oil MIL-L- 3150).

Heavy phosphate coating (MIL-DTL-16232, type M, class 3) (No supplementary treatment).

Heavy phosphate coating (MIL-DTL-16232, type M, class 4) (Chemically converted; may be dyed to color as specified).

Heavy phosphate coating (MIL-DTL-16232, type Z, class 1) (Supplementary preservative treatment to be delineated on drawing immediately following the code).

Heavy phosphate coating (MIL-DTL-16232, type Z, class 2) (Supplementary treatment with preservative conforming to MIL- C-16173, grade 1 or MIL-L-3150).

Heavy phosphate coating (MIL-DTL-16232, type Z, class 3) (No supplementary treatment).

Heavy phosphate coating (MIL-DTL-16232, type Z, class 4) (Chemically converted;  may be dyed to color as specified).