Passivating treatment solution for surface of zinc or zinc alloy and passivation treatment method

Abstract

The invention relates to passivation solution of the surface of zinc or zinc alloy, which contains passivation main salt, oxidant, complexing agent, accelerant and water, wherein, the passivation main salt is water soluble yttrium salt, and the accelerant is soluble metavanadate. The invention also provides a method for passivating the surface of zinc or zinc alloy with the passivation slution. Using the passivation solution and passivation process to passivate the surface of zinc or zinc alloy has high passivation speed, good corrosion of the passivating film, reduces the harm to the environment and the surface resistance of the zinc or zinc alloy passivating film layer, improves the electronic and electromagnetic conductibility, and reduces the hidden danger to the users.

Description

technical field

[0001] The invention relates to a passivation treatment solution and a passivation treatment method, in particular to a passivation treatment solution and a passivation treatment method for the surface of zinc or zinc alloy. Background technique

[0002] In order to improve the corrosion resistance of zinc or zinc alloys (including castings and plating), increase surface gloss and anti-pollution ability, passivation treatment is required to form a dense and stable passivation film on the surface. At present, the passivation method of zinc or zinc alloy surface includes contacting zinc or zinc alloy with passivation solution. According to the composition of passivation solution, passivation method can be divided into hexavalent chromium passivation method and non-hexavalent chromium passivation method .

[0003] The passivation solution used in the hexavalent chromium passivation method contains hexavalent chromium, which can form a dense, stable, and corrosi...

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