Product introduction of anodizing

Anodizing of aluminum is a kind of electrolytic oxidation process. In this process, the surface of aluminum and aluminum alloy is usually transformed into an oxide film, which has protective, decorative and some other functional characteristics. According to this definition, anodizing of aluminum only includes the process of forming anodized film.

The metal or alloy parts are used as anode to form oxide film on the surface by electrolysis. Metal oxide film changes the surface state and properties, such as surface coloring, improving corrosion resistance, enhancing wear resistance and hardness, protecting metal surface, etc. For example, aluminum anodizing, aluminum and its alloy are placed in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as the anode, and electrolysis is carried out under specific conditions and under the action of external current. The anodized aluminum or its alloy forms a thin layer of aluminum oxide on the surface, with a thickness of 5-30 μ m, and the hard anodized film can reach 25-150 μ M. After anodizing, the hardness and wear resistance of aluminum or its alloy are improved, up to 250-500kg / mm2, good heat resistance, the melting point of hard anodized film is up to 2320k, excellent insulation, breakdown resistance voltage is up to 2000V, and the corrosion resistance is enhanced. It does not corrode in ω = 0.03nacl salt spray for thousands of hours. There are a lot of micropores in the thin layer of oxide film, which can absorb all kinds of lubricants. It is suitable for manufacturing engine cylinder or other wear-resistant parts. The micropores of the film have strong adsorption capacity and can be colored into various beautiful and gorgeous colors. Non ferrous metals or their alloys (such as aluminum, magnesium and their alloys) can be anodized. This method is widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, daily necessities and architectural decoration.