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The so-called anodic oxidation of aluminum is an electrolytic oxidation process in which the surfaces of aluminum and aluminum alloys are usually converted into an oxide film that is protective, decorative and has some other functional properties. Anodization of aluminum starting from this definition includes only a part of the process of forming an anodized film.
The metal or alloy parts as the anode, the electrolytic method to form an oxide film on the surface. Metal oxide film changes the surface state and performance, such as surface coloring, improve corrosion resistance, wear resistance and hardness, to protect the metal surface. For example, aluminum anodization, the aluminum and its alloys placed in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as an anode, under the specific conditions and an applied current electrolysis. The anodic aluminum or its alloy is oxidized to form a thin layer of aluminum oxide on the surface with a thickness of 5 to 30 microns and a hard anodized film of 25 to 150 microns. Anodized aluminum or its alloy, to improve its hardness and wear resistance, up to 250 ~ 500 kg / mm 2, good heat resistance, hard anodized film melting point up to 2320K, excellent insulation, resistance Wear voltage up to 2000V, enhanced corrosion resistance, in the ω = 0.03NaCl salt fog by thousands of hours without corrosion. The thin oxide film has a large number of micropores, can absorb a variety of lubricants,suitable for the manufacture of engine cylinders or other wear parts; membrane microporous adsorption ability can be colored into a variety of beautiful and beautiful 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 parts, precision instruments and radio equipment, daily necessities and architectural decoration and so on.