Composite passivating agent for galvanized plate and aluminum alloy and copper alloy metal plate

Abstract

The invention discloses a composite passivating agent for a galvanized plate, an aluminum alloy metal plate and a copper alloy metal plate, and belongs to the technical field of surface treatment of metal materials. The composite passivating agent is prepared from the following components in percentage by mass: 4 to 20% of fatty alcohol polyoxyethylene ether phosphate, 0.5 to 5% of 5-chloro-2-methyl-4-isothiazoline-3-one and 2-methyl-4-isothiazoline-3-one mixture, 0.5 to 5% of sodium dehydroacetate, 0.1 to 2% of sodium N-lauroyl sarcosinate, 0.01 to 0.5% of high-carbon alcohol fatty acid estercomplex, 0.1 to 2% of strontium bismuthate nanospheres, and the balance of water. The composite passivating agent has the advantages that the pretreatment is not required before use, and the composite passivating agent can be directly applied to a metal surface; after the galvanized plate, the aluminum alloy metal plate or the copper alloy metal plate is passivated by the composite passivating agent, the good salt resistance, weather resistance, water resistance, acid resistance, alkaline resistance, solvent resistance, fingerprint resistance and lubricating property are realized.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a composite passivator for galvanized sheets, aluminum alloys and copper alloy metal sheets. Background technique [0002] Zinc, aluminum and copper, as more active metals, are prone to corrosion in humid atmospheres and environments containing chloride ions, which will affect the surface quality of metals. In order to improve the surface quality and corrosion resistance of galvanized sheets, aluminum and copper alloy metal sheets, and prolong the service life of the metal sheets, passivation treatment is required to form a layer of passivation with high density and high stability on the metal surface film to increase the corrosion resistance of the metal plate surface. The hexavalent chromium in the traditionally used chromate passivation agent has carcinogenic effect and is harmful to human body and environment, so it is required to replace...

AI Technical Summary

Problems solved by technology

However, the existing passivators are difficult to meet the above requirements at the same time

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