Surface Treatment Specs: dissimilar_metal_protection_aluminum
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_aluminum | rank1_anodic_plus_paint | true | Rank 1 (most protective): Anodic coating per MIL-A-8625 post-treated with paint or resin coating system | anodizing + organic coating | MIL-A-8625 | aluminum, aluminum alloys |
| dissimilar_metal_protection_aluminum | rank2_chromate_plus_paint | true | Rank 2: Chromate conversion coating per MIL-DTL-5541 post-treated with paint or resin coating system; or anodic coating sealed with resin seal; for porous castings impregnate with resin prior to surface treating | chromate conversion + organic coating | MIL-DTL-5541 | aluminum, aluminum alloys |
| dissimilar_metal_protection_aluminum | rank3_chromate_no_paint | true | Rank 3: Chromate conversion coating without paint or resin; for electrical/thermal conducting in mild atmospheres free of saline, alkaline or acidic conditions | chromate conversion | MIL-DTL-5541 | aluminum, aluminum alloys |
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