Passivator for inhibiting trivalent chromium of zinc coating from being oxidized to hexavalent chromium

Abstract

The invention discloses a passivator for inhibiting trivalent chromium of a zinc coating from being oxidized to hexavalent chromium. The passivator is composed of the following raw materials of, by mass, 80-100 parts of chromic salt, 10-20 parts of other metal salt, 30-40 parts of an oxidizing agent, 10-20 parts of a film forming accelerant, 10-20 parts of a complexing agent, 1-5 parts of a wetting agent, 1-5 parts of an inhibitor and 200 parts of water. The passivator can effectively inhibit the trivalent chromium in a passivated part from being oxidized to the hexavalent chromium, the passivated part does not generate poisonous harmful hexavalent chromium even though being placed for a long time, and the passivator completely meet the RoHS and regulations of relevant provisions of laws and regulations of China.

Description

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AI Technical Summary

Problems solved by technology

However, a trace amount of hexavalent chromium will appear in the passivation layer after the passivation piece treated with the existing trivalent chromium passivation agent is placed fo

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