1. The process of chromium plating for iron parts:
Dewaxing, hot dipping, deoiling, cathode, anode, electrolytic deoiling, weak acid etching, preplating alkali copper, acid bright copper (selection), bright nickel, chromium plating or other
Dewaxing, hot dipping, deoiling, cathode, anode, electrolytic deoiling, weak acid etching, semi bright nickel, high nickel nickel, bright nickel, nickel seal (selection) and chromium plating
2, chromium plating process of zinc alloy
Dewaxing, hot dipping deoiling, cathode electrolysis deoiling, acid leaching, alkaline bright copper, copper pyrophosphate (selectivity), acid bright copper (selectivity), bright nickel and chromium plating
3. Direct chromium plating process for stainless steel
1) electrochemical deoiling, hot water washing, cold water washing and acid leaching activation (1ml/L HCL, 10ml/L H2SO4, room temperature, half a minute; suitable for stainless steel chrome plating on automatic line, not copper or nickel), water washing and chromium plating.
2) cathode electrochemical degreasing cleaning anodic activation (10A / dm2) direct chromium plating.
3) chemical degreasing cleaning anodic electrochemical degreasing cleaning acid leaching activation cleaning chromium plating
Note: when chromium plating, the current density should be 1.5 to 2 times the normal electroplating for 3~5 minutes, and then the normal current density electroplating, to minimize the transition between the various processes. |
