Aluminum section bar surface brightening method

Abstract

The invention discloses an aluminum section bar surface brightening method. The aluminum section bar surface brightening method comprises the steps of sand blasting, oil removing, water washing, polishing, oxidizing, coloring, medium-temperature hole sealing and electrophoresis curing, wherein the polishing is performed inside a three-acid polishing tank, the three-acid polishing tank contains theingredients of, in percentage by weight, 65-85% of phosphoric acid, 14-22% of sulfuric acid and 6-8% of nitric acid, the polishing is performed for 20-25 min under the condition of the polishing temperature being 100-110 DEG C, and by means of reduction of the oxidizing temperature and the oxidizing tank sulfuric acid concentration, the oxide film production speed can be reduced, a more uniform and compact oxide film is obtained, and appearance of flow marks in aluminum materials is reduced; and the aluminum materials are not prone to fading when being subjected to the water washing and electrophoresis after being subjected to the coloring and the hole sealing and high adhesion can be obtained when the electrophoresis is performed in a half hole sealing state, and when combination with the electrophoresis is performed, suitable voltage can slow down the paint film coating speed, in addition of an appropriate curing method, dye color changing and coating surface roughness and excessivebrittleness can be prevented, and the coating adhesion is improved.

Description

Technical field [0001] The invention belongs to the field of surface treatment of aluminum profiles, and in particular relates to a method for brightening the surface of aluminum profiles. Background technique [0002] Aluminum material is one of the most widely used and most widely used metal materials among non-ferrous metals, and its chemical affinity for oxygen is strong. In the atmosphere, its surface is always covered by a dense oxide film, but natural aluminum is oxidized. The film is extremely thin, with large porosity, low mechanical strength, and neither corrosion nor wear resistance can meet the needs of corrosion protection. Using electrochemical methods, a dense, high-quality oxide film can be formed on the surface of the aluminum material, and the film is thick, with a thickness of tens to hundreds of microns, which can effectively improve the corrosion resistance of aluminum. In addition, since the formed oxide film has uniform voids, boiling water sealing, cold s...

AI Technical Summary

Problems solved by technology

[0003] The bright aluminum material produced by the existing method must not be too high to maintain the brightness of the aluminum surface, and the oxide film is not too high, and lacks the protection of electrophoretic paint, resulting in the surface color not resistant to acid and alkali, easy to change color and be eroded by cement

When electrophoresis is performed on the surface of bright decorative aluminum materials, the electrophoretic paint is easy to peel off because it cannot solve the adhesion problem after the aluminum material is dyed and sealed.

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