Anodized aluminum coil is to place the aluminum coil in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as an anode, and conduct electrolysis under specific conditions and the action of an applied current.

The aluminum coil of the anode is oxidized, and a thin layer of aluminum oxide is formed on the surface with a thickness of 5-20 microns, and the hard anodized film can reach 60-200 microns. The anodized aluminum coil has improved its hardness and wear resistance, up to 250 ~ 500 kg/mm2, good heat resistance, hard anodized film melting point up to 2320K, excellent insulation, high breakdown voltage 2000V, enhanced corrosion resistance, no corrosion after several thousand hours in ω=0.03NaCl salt spray. There are a lot of micropores in the thin oxide film layer, which can adsorb various lubricants, suitable for the manufacture of engine cylinders or other wear-resistant parts; the film micropores have strong adsorption capacity and can be colored into various beautiful and bright colors. Non-ferrous metals or their alloys (such as aluminum, magnesium and their alloys, etc.) can be anodized.

Anodized aluminum sheets are widely used in mechanical parts, aircraft auto parts, precision instruments and radio equipment, architectural decoration, machine casings, lamps and lighting, consumer electronics, handicrafts, household appliances, interior decoration, signs, furniture, automotive decoration and other industries.