Anodizing, the electrochemical oxidation of metals or alloys. Under the corresponding electrolyte and specific process conditions, aluminum and its alloys form an oxide film on the aluminum product (anode) due to the action of the applied current. Anodized aluminum or its alloys have improved hardness and wear resistance, and enhanced corrosion resistance. There are a large number of micropores in the thin oxide film, and the film micropores have strong adsorption capacity and can be colored into various beautiful and bright colors.

Anodizing is widely used in mechanical parts, aircraft and auto parts, precision instruments and radio equipment, daily necessities and architectural decoration.

Features of Aluminum Anodizing:
1. Corrosion resistance. The film thickness and sealing quality directly affect the performance.
2. Hardness and wear resistance. The hardness of the substrate is HV100, the ordinary anodized film can reach HV300, and the hard film can reach HV500, and the hardness and wear resistance are consistent.
3. Decorative. It not only maintains the luster and texture of metal, but also can be dyed into colorful colors.
4. Organic coating and electroplating adhesion. It can effectively improve the adhesion and corrosion resistance of the surface layer.
5. Electrical insulation. Aluminum is a good conductor, and oxide film is a high-resistance insulating film. The dielectric breakdown voltage can reach 30~200V/um, the volume resistivity at room temperature is 109Ω/cm3, and it can reach 1013Ω/cm3 at 250℃.
6. Transparency. The higher the aluminum purity, the higher the transparency of the oxide film.
7. Functionality. Using the porosity of the oxide film, functional particles can be deposited in the micropores to obtain functional materials.