The bottom layer for painting and electroplating: due to the porous nature of the oxide film layer and good adsorption capacity, it has good adhesion with the paint film and the organic film, and can be used as a primer layer. A film anodized with aluminum phosphate can be used as a bottom layer for electroplating on aluminum.
Preventing corrosion of the product: The film obtained by the anodization of aluminum is properly sealed and has good stability in the atmosphere. Whether it is an aluminum anodized film obtained from a sulfuric acid solution, an oxalic acid solution or a chromic acid solution in a normal process, the corrosion resistance is excellent.
Protective decoration: On the oxide film with high transparency, the oxide film has the characteristics of adsorbing various organic dyes or inorganic pigments. Various bright and bright colors and patterns can be obtained on the oxide film, and many new processes have been added in recent years. The appearance of such an oxidation multiple coloring, fireworks pattern, wood grain pattern, oxidative offset transfer printing, porcelain oxidation, etc., make the aluminum appearance more beautiful and pleasing to the eye, this layer of color film is both a decorative layer and an anti-corrosion layer, such as a lighter , gold pens and crafts.
As a hard wear-resistant layer: in sulfuric acid or oxalic acid solution, by adjusting the anodizing process conditions, a thick and hard film layer can be obtained, and the pores and absorption properties of the film layer can be used to store the selected oil material, and the utility model can be effectively applied. The conditions for working under friction are characterized by lubrication and wear resistance, such as engine cylinders and pistons for automobiles and tractors.
As an electrical insulating layer: the aluminum anodized film layer has the characteristics of large electric resistance, and the thickness of the film layer is proportional to the electric resistance. This feature has certain practical significance as electrical insulation, and can be used as a dielectric of a capacitor, and can also be used. Alumina skin is used as the outer sheath of the cable, and the surface of the cable is used as an insulating layer instead of the plastic foreskin and the plastic foreskin. The film has a penetration voltage of 441V when the film thickness is 27.5μm. If the phenolic resin is used as the film hole filling, the withstand voltage can be increased by 2 times. In the oxalic acid solution, when the film thickness is increased, a high-quality insulating layer having a resistance of 200 Ω and a breakdown voltage of 980 V can be obtained. In addition to being used for wires, it can also be used for other electrical appliances.
