Powder-sprayed aluminum product and surface processing method for same

Abstract

The invention discloses a powder-spraying aluminum product and a surface processing method for the same. The surface of the aluminum product and a low-lying part of a profile of the aluminum product are coated with a composite film; the composite film is a composite film containing O, Al, C and F; and the composite film is coated with a powder resin film. The to-be-processed aluminum product is put in an oil removal polishing agent and a reaction is conducted till the surface of the aluminum product and the low-lying part of the profile is coated with the uniform composite salt film protectionlayer; without water washing, the product is put in an electrolytic oxidation liquid, and a layer of composite film is generated through electrolytic oxidation; and the aluminum product obtained after electrolytic oxidation is washed by water, dried and treated with electrostatic dusting, and a layer of powder resin film is formed on the composite film. The aluminum product and the method disclosed by the invention have the beneficial effects that during dusting of the aluminum product, the organic-inorganic composite film is generated through re-electrolysis on the surface of the aluminum product where the composite salt film protection layer is already formed, so that good adhesion force is generated between the oxidation film and the powder layer; corrosion resistance performance is enhanced; and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to an aluminum product, in particular to a surface treatment technology for a powder-sprayed aluminum product. Background technique [0002] At present, the powder spraying treatment process of aluminum alloy products is a process of curing thermosetting polyester, polyurethane, chlorotrifluoroethylene-vinyl ether (FEVE) powder and thermoplastic polyvinylidene fluoride (PVDF) powder as the film layer. process. Most of the aluminum products are degreased, alkali washed, pickled, water washed, chemically transformed into a film (usually chromium and chromium-free passivation), and then washed and dried, followed by powder spraying according to GB5237.4: The powder resin is selected for powder spraying, and finally the powder sprayed aluminum product is obtained after curing. The powder spraying process of the prior art is complicated, and a large amount of waste water and solid waste are generated during the production process, in...

AI Technical Summary

Problems solved by technology

The powder spraying process of the prior art is complicated, and a large amount of waste water and solid waste are generated during the production process, including a large amount of hazardous waste. A large amount of chemical raw materials and water, and about 4Kg of Al per ton of pre-treatment is washed out and discharged

[0003] Therefore, the current powder spraying 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.

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