Surface Treatment Specs: anodizing
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 | coefficient of friction | corrosion resistance salt spray hrs (hr) | finish appearance | hardness max HV (HV) | hardness min HV (HV) | hardness typical HV (HV) | notes | operating temp max C (C) | process type | standard | substrate compatibility | thickness max in (in) | thickness max um (um) | thickness min in (in) | thickness min um (um) | thickness typical um (um) | wear resistance |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| anodizing | anodize_type_II_sulfuric | 0.20-0.30 | 500 | clear (natural) or dyed | 350 | 200 | 280 | Sulfuric acid; standard decorative/protective anodize; dyeable; Class 1=unsealed, Class 2=sealed; excellent corrosion per AMS 2471; most common aluminum finish | 175 | anodizing (chemical conversion) | MIL-A-8625 Type II; AMS 2471 | aluminum alloys (6061, 7075, 2024, 5052) | 0.001 | 25 | 0.0002 | 5 | 10 | moderate |
| anodizing | anodize_type_I_chromic | 0.20-0.30 | 500 | grey-green opaque | 350 | 200 | 250 | Chromic acid process; thinnest layer; best fatigue resistance; corrosion resistant; Cr6+ in process bath (REACH restricted); use Type IB for replacement where possible | 120 | anodizing (chemical conversion) | MIL-A-8625 Type I; AMS 2470 | aluminum alloys (6061, 7075, 2024) | 0.0003 | 7 | 0.00004 | 1 | 2 | moderate |
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