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In the actual process, the anodizing of aluminum alloy is more, and it can be applied in daily life. The characteristics of this process make the surface of the aluminum piece have a hard protective layer, which can be used for the production of daily necessities such as kitchen utensils. However, the anodizing effect of cast aluminum is not good, the surface is not good, and it can only be black. The aluminum alloy profile is better. In the past ten years, China's aluminum oxidation coloring technology has developed rapidly. Many factories have adopted new technology and accumulated rich experience in actual production. There are many anodizing processes for aluminum and its alloys that have matured and are being developed, and suitable processes can be selected according to actual production needs. Before selecting the oxidation process, the aluminum or aluminum alloy material should be known, because the quality of the material and the composition of the material will directly affect the quality of the anodized aluminum product. In this regard, Hong Jiude and Comrade Fan Ji have devoted themselves to the discussion (see Electroplating and Finishing, No. 2, 1982, P.27). For example, if there are defects such as bubbles, scratches, peeling and roughness on the surface of the aluminum, all the rickets will still be revealed after anodizing. The alloy composition also has a direct effect on the surface appearance after anodization. For example, an aluminum alloy containing 1 to 2% manganese is brownish blue after oxidation. As the amount of manganese in the aluminum increases, the surface color after oxidation changes from brownish blue to dark brown. The aluminum alloy containing 0.6 to 1.5% of silicon is gray when oxidized, and white-gray when it contains 3 to 6% of silicon. Zinc-containing is an opalescent color, chrome is a golden to gray uneven color, and nickel is yellowish. In general, only aluminum containing gold containing more than 5% of titanium contains gold, which is oxidized to give a colorless, transparent, bright, smooth appearance. After selecting aluminum and aluminum alloy materials, it is natural to consider the selection of an appropriate anodizing process.

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