Recipe design for enabling aluminum alloy spraying oil removal groove and chromate-free passivation groove chemical to be compatible

Abstract

The invention discloses recipe design for enabling an aluminum alloy spraying oil removal groove and chromate-free passivation groove chemical to be compatible. The recipe design thoroughly solves theproblems that a 1# oil removal groove and a 4# chromate-free passivation groove are not stable, fluorine-containing sludge is generated on the groove bottom easily, and toxic and dangerous waste needs to be cleared manually. Stable ingredients of groove liquid in a traditional oil removal groove and a chromate-free passivation groove are insufficient and are decomposed and deposited easily; and ingredients of oil removing liquid is brought into the 4# chromate-free passivation groove through a 3# water washing groove, and incompatibility is caused. By means of the design for enabling the ingredients of the 1# oil removing groove and the ingredients of the 4# chromate-free passivation groove to be compatible, the oil removing liquid does not consume chromate-free passivation groove chemical and can supplement ingredients, and the production cost is reduced. By means of addition of a corrosion inhibitor, a chelating agent and bonderite, and chelation with positive ions, generation of fluoride and hydroxide is eradicated, it is ensured that the groove liquid is not turbid or deposited, and aluminum alloy powder spraying chromate-free passivation pre-treatment stable production is achieved.

Description

technical field [0001] The invention relates to the technical field of chromium-free passivation pretreatment of aluminum alloy spraying, in particular to the formulation design of an aluminum alloy spraying degreasing tank compatible with chromium-free passivation tank chemicals. Background technique [0002] For a long time, people have realized that the chromium-containing passivation technology has serious chromium pollution in the whole process of aluminum profile production, use and disposal. It is the goal of the aluminum profile manufacturing industry to achieve chromium-free passivation treatment on the surface of aluminum profiles. In order to meet the needs of the industry for chromium-free passivation technology, researchers have carried out a lot of research work. In the past 30 years of research on the technology of chromium-free passivation on the surface of aluminum and its alloys, a variety of aluminum and aluminum alloys have been produced. The research res...

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Problems solved by technology

[0012] Although the rare earth chromium-free passivation technology has made some progress, it has not been able to effectively solve the problems such as the toxicity of rare earth inorganic salts and its impact on the environment.

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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