Surface Treatment Specs: dissimilar_metal_protection_magnesium
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_magnesium | rank1_anodic_plus_paint | true | Rank 1 (most protective): Anodic coating per ASTM D1732 post-treated with alkali-resistant paint or resin coating system; bare magnesium must not be used | anodizing + organic coating | ASTM D1732 | magnesium |
| dissimilar_metal_protection_magnesium | rank2_chromate_plus_paint | true | Rank 2: Chromate conversion coating per SAE AMS-M-3171 post-treated with alkali-resistant paint or resin coating system; alternate for general use in non-persistent wet or marine atmosphere; or anodic coating without organic coating as sub-option; bare magnesium must not be used | chromate conversion + organic coating | SAE AMS-M-3171 | magnesium |
| dissimilar_metal_protection_magnesium | rank3_electroless_nickel_cad_overplate | true | Rank 3: Electroless nickel per SAE AMS-C-26074 or MIL-DTL-32119 with cadmium overplating per SAE AMS-QQ-P-416; for electrical/thermal conducting purposes in absence of wet, saline or acidic conditions; bare magnesium must not be used | electroless nickel + cadmium overplate | SAE AMS-C-26074; MIL-DTL-32119; SAE AMS-QQ-P-416 | magnesium |
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