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Galvanized black passivation

  • Author:naky
  • Source:www.diecastingpartsupplier.com
  • Release on:2014-12-22
Galvanized black passivation

Galvanized black chromate passivation layer is added to copper ions or silver ions in the chromate solution, to obtain excellent corrosion resistance , and the thick black passivation film. It mainly depends on the chromate layer of zinc , copper or silver oxide reduction reactions forming gum zincate film , adsorption of metal copper, silver colloidal particles . Therefore , the passive film corrosion resistance, with a uniform black decorative appearance and good adhesion of the decorative appearance and good adhesion.

Process Step

Steel parts - before treatment - galvanized - water - zinc coating - light - water - black passivation - water - hot air drying - ( or dip dehydration rust ) - Drying - Inspection - hood paint curing