Aluminum itself is a very corrosion-resistant material, but it forms alumina oxidation on the surface of aluminum in case of oxygen, which will slowly eliminate its corrosion resistance and bran resistance for a long time. Moreover, aluminum is very sensitive to acidic substances. When it encounters acid, it will destroy the surface composition layer of aluminum. Then we need to oxidize again and add another layer to the surface to improve the corrosion resistance of the surface layer. After the surface anodized treatment of aluminum pipe material or products, their corrosion resistance, hardness, wear resistance, insulation and heat resistance have been greatly improved. The outer layer of the anodic oxide film of aluminum is porous, which is easy to absorb dye and colored substances, so it can be dyed to improve its decoration. After the oxide film is closed with hot water, high temperature water vapor or nickel salt, it can further improve its corrosion resistance and wear resistance.

Aluminum anodized oxidation process is widely used in the surface treatment of aluminum products, and its industrial application can be roughly divided into as follows:

Prevent corrosion of products

Because the membrane layer obtained by anodized oxidation is properly closed, it has good stability in the atmosphere. Whether from sulfuric acid solution, oxalic acid solution or chromium acid solution in the normal process of the oxide film, its corrosion resistance is very good, such as daily aluminum pot, pot, washing machine tank, etc. Chromic acid oxidation method is especially suitable for aluminum welding parts and riveting parts.

Protection-decoration

In high transparency of oxide film, oxide film can adsorption characteristics of a variety of organic dyes or inorganic pigment, oxide film can obtain a variety of bright colors and patterns, and in recent years a lot of new technology such as an oxidation coloring, fireworks pattern, wood pattern, oxidation offset printing, oxidation, porcelain oxidation, etc., make aluminum appearance more beautiful eye, this layer of color film is not only decorative layer, and corrosion layer, such as lighters, pens and arts and crafts. In recent years, it has been deeply loved by its own advantages.