Surface Treatment Specs: phosphate_coating
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 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| phosphate_coating | manganese_phosphate | 0.03-0.09 (oil) | dark grey to black | 120 | 80 | 100 | Parkerizing; heavy coating; oil-soaked provides lubrication for sliding steel surfaces; firearm and military ordnance standard; reduces galling | 260 | chemical conversion | MIL-DTL-16232 Type M; AMS 2485 | carbon steel, alloy steel, cast iron | 0.0012 | 30 | 0.0003 | 8 | 15 | moderate (with oil) |
| phosphate_coating | zinc_phosphate | 0.06-0.12 (oil) | dark grey | 110 | 70 | 90 | Paint adhesion and corrosion resistance (with topcoat/oil); automotive body prep (Bonderite); zinc phosphate preferred over iron for maximum corrosion; manganese variant used for wear/friction | 200 | chemical conversion | MIL-DTL-16232; ASTM D769 | carbon steel, cast iron, some alloy steels | 0.001 | 25 | 0.0002 | 5 | 10 | low (base for paint) |
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