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Update of anodizing pretreatment process

Article source: Editor in charge of the website: Author: popularity: - Time of publication: 15-12-01 17:20:00

The purpose of anodizing pretreatment is to remove natural oxide film, grease and impurities on the surface to obtain uniform and clean aluminum surface, which is conducive to the formation of high-quality anodized film in Dongguan. Chinese users also require to remove the extrusion fringes to obtain a uniform and beautiful surface. In the early stage, alkali etching method was used to obtain matte surface, but excessive etching made aluminum loss very large, generally up to 3% - 5.5%, which not only increased the cost, but also caused serious environmental problems, forming matte surface and exposing the inherent structural defects of the profile.

Since then, Japan introduced the acid etching method in China (basically not used for aluminum profiles in Japan). Due to the low aluminum consumption (up to about 1%), the surface fineness was once welcomed by Chinese manufacturers. However, due to the fluoride ion as the main body of the tank liquid, brought more serious pollution, once caused a heated discussion. Mechanical etching method has the advantages of low operating cost, good environmental benefits and fine surface without streaks. It has been widely used in European countries such as France and Italy.

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