Surface Treatment Specs: dissimilar_metal_protection_zinc
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_zinc | rank1_anodic_plus_paint | true | Rank 1 (most protective): Anodic coating post-treated with paint or resin coating system; primarily for castings; bare plated zinc must not be used in marine environment | anodizing + organic coating | (anodic process) | zinc alloy castings |
| dissimilar_metal_protection_zinc | rank2_chromate_plus_paint | true | Rank 2: Chromate conversion coating per MIL-C-17711 post-treated with paint or resin coating system; or anodic coating without organic coating system; for non-persistent wet or marine atmosphere; for electrical/thermal conducting in mild atmospheres; bare plated zinc must not be used in marine environment | chromate conversion + organic coating | MIL-C-17711 | zinc alloy castings, hot-dip galvanized |
| dissimilar_metal_protection_zinc | rank3_chromate_no_paint | true | Rank 3 (least protective listed): Chromate conversion coating without paint or resin system; bare plated zinc must not be used in marine environment | chromate conversion | MIL-C-17711 | zinc |
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