Surface Treatment Specs: zinc_plating
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| zinc_plating | zinc_black_chromate | 0.15-0.25 | 120 | matte black | 100 | 70 | 80 | Decorative black finish; lowest corrosion resistance of chromate types; requires clear topcoat for outdoor use | 120 | electroplating | ASTM B633; MIL-PRF-27418 | carbon steel, cast iron | 0.001 | 25 | 0.0002 | 5 | 8 | low |
| zinc_plating | zinc_clear_chromate | 0.15-0.25 | 96 | bright silver | 100 | 70 | 80 | Type III clear/colorless chromate passivate; RoHS-compliant trivalent Cr; SC1=5µm/SC4=25µm; protects against white rust | 120 | electroplating | ASTM B633 SC1-SC4; MIL-PRF-27418 | carbon steel, cast iron, copper alloys | 0.001 | 25 | 0.0002 | 5 | 8 | low |
| zinc_plating | zinc_yellow_chromate | 0.15-0.25 | 200 | yellow iridescent | 100 | 70 | 80 | Type II colored chromate; provides 2–3× better corrosion resistance than clear; hexavalent Cr process (not RoHS); trivalent alternatives available | 120 | electroplating | ASTM B633 SC1-SC4; MIL-C-5541 | carbon steel, cast iron, copper alloys | 0.001 | 25 | 0.0002 | 5 | 8 | low |
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