Chemical properties of zinc is lively, easily oxidized in the atmosphere darkens, and finally generate “white rust” corrosion galvanized after chromate treatment, covered with a layer of chemical conversion coating film on zinc, so that the reactive metal is in the passive state,This is called a layer of zinc chromate passivation. (For the plated parts enhance the protective properties, decorative and other special purpose passivation, hot melt, closed and hydrogen, etc.) after plating processing. Galvanized generally chromate or other conversion treatment, the formation of the corresponding type conversion coating is to ensure the quality of one of the key processes plated passivation preferably should be carried out after the aging treatment (oven 70 to 80oC).
Electro galvanished passivated has the following effects:
1,Improve the corrosion resistance of the zinc coating.
2,so that the surface is not prone to fingerprints or other contamination.
3,Increase the binding force of the subsequent coat.
4,color or decorative effect.
Post time: Nov-10-2020