Surface Treatment Specs: dissimilar_metal_protection_cadmium_beryllium
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_cadmium_beryllium | rank1_chromate_plus_paint | true | Rank 1 (most protective): Chromate conversion coating per SAE AMS-QQ-P-416 / AMS-C-8837 / AMS-C-81562 post-treated with paint or resin coating system | chromate conversion + organic coating | SAE AMS-QQ-P-416; SAE AMS-C-8837; SAE AMS-C-81562 | cadmium, beryllium |
| dissimilar_metal_protection_cadmium_beryllium | rank2_chromate_no_paint | true | Rank 2 (least protective listed): Chromate conversion coating without organic coating system; for non-persistent wet or marine atmosphere; for electrical/thermal conducting in mild atmospheres; recommended for beryllium in high-temperature applications to forestall catastrophic oxidation in oxygen-containing atmosphere | chromate conversion | SAE AMS-QQ-P-416; SAE AMS-C-8837; SAE AMS-C-81562 | cadmium, beryllium |
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