Plastic plating-Passivation of Chromium layer

Plastic plating-Passivation of Chromium layer.
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As we all know, the passivation treatment of zinc, cadmium and their alloy coatings can improve the corrosion resistance, increase the surface decoration and improve the adhesion between organic coatings and the surface. The traditional hexavalent chromium passivation film contains hexavalent chromium and trivalent chromium, which has good anti-corrosion performance and beautiful appearance, but hexavalent chromium has high toxicity and carcinogenicity and does serious harm to the environment. In addition, with the emergence of cyanide-free alkaline zinc plating process, the problem of hexavalent chromium passivation also emerges. In cyanide-free alkaline zinc plating, organic additives (including brightener, grain refiner and wetting agent, etc.) must be used to change the quality of the passive film. The cyanide-free alkaline zinc plating bath is easily contaminated by iron impurities, which darkens or even darkens the passivation film.