Method for anodizing surface of high corrosion-resistant aluminum profile

Abstract

The invention relates to a method for anodizing the surface of a high corrosion-resistant aluminum profile. The method particularly comprises four steps of degreasing, oxidation, modification and electroplating, specifically, an anodizing solution is a mixed solution of pyruvic acid, sulfuric acid, ANODAL EE solution additive, dipotassium hydrogen phosphate, monopotassium phosphate, aluminum sulfate, artificial plasma and deionized water. According to the anodizing method, firstly, the surface of the aluminum alloy is degreased by using a degreaser, an oxide film on the surface is removed by dilute acid, then the surface of the aluminum alloy is oxidized to form an oxide film by means of the matching of anodic oxidation and cathodic electroplating, and a high corrosion-resistant chromium film is electroplated on the outer layer of the oxide film, so that the corrosion-resistant performance of the surface of the aluminum alloy is remarkably improved, and the surface of the aluminum alloy is modified; and compared with a common anodic oxidation process, the oxide film is higher in hardness, more resistant to scratching, impact and abrasion, higher in corrosion resistance, and capableof improving customer experience value, and the method has excellent practicability and creativity, high market value and wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a method for anodizing the surface of high corrosion-resistant aluminum profiles. Background technique [0002] For nearly fifty years, Porous Anodic Alumina has been widely studied and used in various industrial production and scientific research fields. From a structural point of view, the micropore distribution of the porous anodized aluminum layer is highly ordered, showing a hexagonal close-packed periodic structure. The columnar channels are perpendicular to the aluminum substrate and parallel to each other. The pore diameter, pore spacing, and film thickness can be adjusted within a certain range. , the hole density can reach 10 9 ~10 10 / cm 2 , These structural characteristics of porous anodized aluminum and its unique functional characteristics have aroused great interest among scholars, and researchers at home and abroad have rushed to car...

AI Technical Summary

Problems solved by technology

Patent CN101240440A discloses the process of preparing high-hardness and large-aperture thick film by mixed acid anodic oxidation. Phosphoric acid and oxalic acid are used to prepare mixed acid as an anodic oxidation electrolyte. By adjusting the ratio of phosphoric acid and oxalic acid in different electrolytes, the oxidation voltage of 80-150V Anodized alumina with a pore size of 80-140nm was prepared under the following conditions, but the order of the pore size is still not very good

In addition, some researchers used SiC film, Si3N4 film, etc. to imprint hexagonal densely packed periodic small pits on the surface of aluminum sheet before anodizing. And choose the corresponding anodization voltage and electrolyte type and concentration, during anodization, the pores will grow down along these small pits, and then generate an ordered template with a perfect hexagonal close-packed periodic structure, but this technology It is more complex and costly, and it is difficult to achieve general experimental conditions, let alone large-scale industrial production

[0004] However, although the anodic oxide film obtained by the ordinary anodic oxidation treatment process of aluminum alloy has the advantages of good adsorption and easy dyeing, so as to meet the high decorative requirements, the hardness of the oxide film is not high, and it is easy to be bruised and scratched. , scratches, causing the appearance to be affected, thereby affecting the consumer experience