Aluminum plate oxidation technology

Aluminum plate oxidation technology

[China Aluminum Industry Network] The anodizing of aluminum alloys is relatively large and can be applied in daily life. It is believed that the characteristics of this process will create a hard protective layer on the surface of aluminum parts and 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, it can only be black. Aluminum alloy profiles are better, the following is a brief introduction to aluminum oxide oxidation methods.

In the past ten years, the technology of aluminum oxide coloring in China has developed rapidly. Many factories have adopted new process technologies and have accumulated rich experience in actual production. There are many anodizing processes for aluminum and its alloys that are already mature and are being developed, and the appropriate process can be selected from the actual production needs.

Prior to the selection of the oxidation process, knowledge of the aluminum or aluminum alloy materials should be understood. Because the quality of the material, the difference in ingredients, will directly affect the quality of the anodized aluminum products. On this point, Comrades Hong Jiude and Fan Ji have already discussed it in detail (see “Plating and Finishing,” 2nd Issue, 1982, p. 27).

For example, if there are defects such as air bubbles, scratches, peeling, and roughness on the surface of aluminum, all rickets will still appear after anodization. The alloy composition also has a direct effect on the appearance of the anodized surface.

For example, an aluminum alloy containing 1 to 2% of manganese is brownish blue after oxidation. With the increase in the amount of manganese contained in the aluminum, the surface color after oxidation changes from brown to dark brown.

0.6-1.5% of aluminum alloys containing silicon are gray after oxidation, and white-gray when they contain 3 to 6% of silicon.

Zinc is milky, chromium-containing non-uniform shades from golden to grey, and nickel-containing yellowish.

In general, only aluminum containing magnesium and titanium content greater than 5% contains gold, which can be oxidized to give a colorless, transparent, shiny, smooth appearance.

After selecting the aluminum and aluminum alloy materials, it is naturally necessary to consider selecting an appropriate anodizing process. At present, sulfuric acid oxidation, oxalic acid oxidation, and chromic acid oxidation, which are widely used in China, have been introduced in detail in manuals and books, and need not be repeated.

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