Aluminium alloy chromium-free passivating agent and aluminium alloy chromium-free passivating treatment system
A chromium-free passivation agent and chromium-free passivation technology, applied in the direction of metal material coating process, etc., can solve problems such as volatilization pollution, and achieve the effects of eliminating pollution, easy mass production, and easy wastewater treatment
Active Publication Date: 2014-04-30
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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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
Method used
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Examples
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Effect test
Embodiment 1
[0080] In this example, fluotitanic acid and fluozirconic acid (50wt.%) are 2.5g / L; ethylene glycol is 5.0g / L, sodium tripolyphosphate is 7.0g / L, the working temperature is 25°C, and the pH value is 3.5 , Passivation time 60s.
Embodiment 2
[0082]In this example, fluotitanic acid and fluozirconic acid (50wt.%) 2.5g / L; glycerin 5.0g / L, sodium tripolyphosphate 7.0g / L, working temperature is 25°C, pH value is 3.5 , Passivation time 60s.
Embodiment 3
[0084] In this example, fluotitanic acid and fluozirconic acid (50wt.%) 2.5g / L; sorbitol 5.0g / L, sodium tripolyphosphate 7.0g / L, working temperature is 25°C, pH value is 3.5, Passivation time 60s.
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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...
Claims
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Login to View More IPC IPC(8): C23C22/34C23C22/36C23C22/73
Inventor 熊晨凯熊映明
Owner FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH