Surface Treatment Specs: dissimilar_metal_protection_carbon_low_alloy_steel
Electroplating and surface treatment specifications covering thickness ranges, hardness, corrosion resistance (salt spray hours), wear resistance, operating temperature limits, substrate compatibility, applicable standards, and finish appearance. Processes include zinc plating (clear/yellow/black chromate), zinc-nickel, bright electrolytic nickel, electroless nickel (mid/high phosphorus), hard chrome (hexavalent and trivalent), decorative chrome, tin, silver, gold, cadmium, anodizing (Type I/II/III per MIL-A-8625), zinc/manganese phosphate, black oxide, stainless steel passivation, and electropolishing.
| treatment category | treatment variant | dissimilar coupling context | notes | process type | standard | substrate compatibility |
|---|---|---|---|---|---|---|
| dissimilar_metal_protection_carbon_low_alloy_steel | rank1_metallic_coating_plus_paint | true | Rank 1 (most protective): Metallic coating (sacrificial Zn or Cd with supplemental passivation, or non-sacrificial Cu or Ni) with paint or resin coating system; for steels >220 ksi apply by non-electrolytic methods; for <=220 ksi electrolytic is allowed but stress relieve before plating and hydrogen embrittlement relieve after plating | metallic coating + organic coating | (MIL-DTL-5541; sacrificial Zn or Cd; non-sacrificial Cu or Ni) | carbon steel, low alloy steel |
| dissimilar_metal_protection_carbon_low_alloy_steel | rank2_metallic_coating_no_paint | true | Rank 2: Metallic coating without paint or resin; for direct metallic contact or achieving least potential difference; for steels >220 ksi apply by non-electrolytic methods only | metallic coating | (sacrificial Zn or Cd; non-sacrificial Cu or Ni) | carbon steel, low alloy steel |
| dissimilar_metal_protection_carbon_low_alloy_steel | rank3_zinc_phosphate_plus_paint | true | Rank 3: Zinc phosphate conversion coating per TT-C-490 post-treated with paint or resin; for steels 150–220 ksi stress relief required before and hydrogen embrittlement relief required after phosphating; PROHIBITED for steels >220 ksi | zinc phosphate conversion + organic coating | TT-C-490 | carbon steel, low alloy steel (<=220 ksi) |
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