Anodizing of aluminum is an electrolytic oxidation process in which the surfaces of aluminum and aluminum alloy are usually converted into an oxide film with protective, decorative and other functional properties. Starting from this definition, the anodization of aluminum includes only the part of the process of forming an anodized film. Anodizing and electroplating are not recommended for China Aluminum Die Casting Products. Defects such as air streaks, cold insulation and sand holes are easily produced on the surface of aluminum die castings.

The general anode is suggested to be aluminum extruded material, and the electroplating is changed to zinc aluminum alloy or zinc alloy. Metal or alloy parts are used as anodes, and oxide films are formed on their surfaces by electrolysis. The 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 is anodized, aluminum and its alloys are placed in corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as anodes, and electrolysis is carried out under specific conditions and under the action of applied current. Anode aluminum or its alloy is oxidized to form a thin layer of aluminum oxide on the surface with a thickness of 5-30 microns and a hard anodic oxide film of 25-150 microns. The anodized aluminum or its alloy improves its hardness and wear resistance, reaching 250-500kg/mm2, good heat resistance, hard anodized film melting point as high as 2320K, excellent insulation, breakdown voltage as high as 2000V, enhanced corrosion resistance, and no corrosion in Ω = 0.03 NaCl salt spray for thousands of hours.

The oxide film thin layer has a large number of micropores, can absorb various lubricants, and is suitable for manufacturing engine cylinders or other wear-resistant parts; The membrane has strong micropore 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.

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