Aluminium alloy chromium-free passivating agent and aluminium alloy chromium-free passivating treatment system

Abstract

The invention discloses an aluminium alloy chromium-free passivating agent. The aluminium alloy chromium-free passivating agent comprises fluotitanic acid, fluozirconic acid, a corrosion inhibitor and a chelating agent, wherein the concentrations of the fluotitanic acid and the fluozirconic acid (50wt.%) are 2.0-3.0g / L, the concentration of the corrosion inhibitor is 4.0-6.0g / L, and the concentration of the chelating agent is 6.0-8.0g / L. The aluminium alloy chromium-free passivating agent has the advantages that the pollution of chromium salt to water is completely eliminated from the source; the aluminium solving amount is reduced, powder applied to the surface of the aluminum alloy is reduced, and the service life of passivating liquid is prolonged; the passivation speed of the passivating agent is more than three times of that of chromium salt, and the production efficiency is improved. Meanwhile, the invention discloses an aluminium alloy chromium-free passivating treatment system. The aluminium alloy chromium-free passivating treatment system is simple to operate, energy-saving and environmentally-friendly, can be used for easily treating wastewater and facilitates large-scale production. The aluminium alloy chromium-free passivating treatment system is used for completely avoiding chromium pollution generated in processes of treating surfaces of building aluminium profiles, using the building aluminium profiles and treating wasted building aluminium profiles and solving the bottleneck problem of restricting the development of industries.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a chromium-free passivation agent for aluminum alloy and a chromium-free passivation treatment system for aluminum alloy. Background technique [0002] my country is the world's largest producer and consumer of aluminum. Because aluminum alloy has excellent physical, chemical and mechanical processing properties, it has been widely used in aerospace, transportation, light industrial building materials and other fields. About 13 million tons of aluminum alloy are processed every year in the country. Reached 3.5 million tons, and the output value exceeded 100 billion yuan. However, aluminum alloys are prone to pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue when used in humid, industrial gas, fuel gas, salt and dust atmospheres, which limit their application range and shorten the service life of aluminum alloys. . In order to meet the different r...

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Problems solved by technology

However, the applicant believes that, compared with the inorganic salt composite conversion film, although the organic passivation film is a directional technology for surface pretreatment in the future, there are still many factors such as cost, solvent volatilization pollution, etc. Constraints, a long way to go

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