Surface Treatment Specs: hard_chrome
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| hard_chrome | hard_chrome_functional | 0.08-0.16 | 200 | bright grey | 1100 | 850 | 950 | Cr6+ process; 900–1100 HV (68–70 HRC); wear surface applications; typically 0.0005–0.002 in for hydraulics; grinding to size after plating; phasing out per REACH/RoHS | 425 | electroplating | QQ-C-320 Class 2; MIL-STD-1501; AMS 2406 | steel, stainless steel, nickel alloys, copper | 0.02 | 500 | 0.0005 | 13 | 50 | very high |
| hard_chrome | trivalent_hard_chrome | 0.10-0.18 | 150 | dull grey | 950 | 750 | 850 | Emerging Cr3+ alternative to hexavalent hard chrome; slightly lower hardness and thickness capability; Macdermid MacroCrystalline, Atotech ChromaDur; ELV/RoHS compliant | 400 | electroplating | Proprietary / emerging Cr3+ standards | steel, cast iron, stainless steel | 0.01 | 250 | 0.0005 | 13 | 25 | high |
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