Weather-proof paint film protective layer aluminum product and surface treatment method thereof

Abstract

The invention discloses a weather-proof paint film protective layer aluminum product and a surface treatment method thereof, the surface of the aluminum product is provided with a paint film protective layer, and the weather-proof paint film protective layer aluminum product is characterized in that a layer of chemical conversion film is further arranged between the surface of the aluminum product and the paint film protective layer; the chemical conversion film is formed after the aluminum product is subjected to oil removal polishing and chemical conversion; the chemical conversion coating contains aluminum oxalate, aluminum fluoride, sodium aluminum hexafluoride, zirconium salt or titanium salt and zirconium-titanium double salt. According to surface pretreatment of the electrophoresis or paint spraying aluminum product, oil removal and chemical conversion are completed in one step through the oil removal chemical conversion liquid, a layer of chemical conversion protection film is formed on the surface of the product, the corrosion resistance, pollution resistance and surface binding capacity of the product are improved, and the filiform corrosion resistance of the aluminum product is improved; and the corrosion-resistant quality requirements in special fields such as automobile parts and the like can be met.

Description

technical field [0001] The invention relates to an aluminum product, in particular to a surface treatment technology for the aluminum product. Background technique [0002] The current electrophoretic surface treatment process of aluminum alloy products refers to the process of using water-soluble paint or varnish to be cured by electrophoresis as a film layer. The commonly used treatment process is to degr , oxidation film, water washing, pure water washing, and then electrophoresis film formation. There is also a treatment process that is degreasing (surfactant, sulfuric acid or phosphoric acid hydrofluoric acid, etc.), water washing, alkali washing (sodium hydroxide), water washing (two passes), acid washing, and water washing (two passes) through aluminum products. , passivation, pure water washing, then electrophoretic film formation, and finally solidification. The entire process of these two treatment processes is complex, and a large amount of waste water and solid...

AI Technical Summary

Problems solved by technology

Another treatment process is to remove oil (surfactant, sulfuric acid or phosphoric acid hydrofluoric acid, etc.), water washing, alkali washing (sodium hydroxide), water washing (two processes), pickling, water washing (two processes) , passivation, pure water washing, then electrophoresis to form a film, and finally solidify. These two treatment processes are complex in the whole process, and a large amount of waste water and solid waste are generated in the production process, including a large amount of hazardous waste. Not only the production process is complicated, but the production control requirements Higher, it also brings a lot of pollutants to the environment, and the second treatment process is not oxidized, the electrophoretic coating has low adhesion and poor corrosion resistance

In short, the problems existing in the current surface treatment technology of aluminum products are all environmental protection issues that have been restricting the development of the industry.

[0004] Therefore, the current electrophoresis or painting treatment process of aluminum products has complex process flow, a large amount of water washing causes a lot of water waste and water pollution, and also wastes some chemical raw materials, resulting in increased production costs, especially poor weather resistance, which cannot meet the needs of special industries. Anti-corrosion requirements

Images