What kind of material is anodized alumina? What are the features?
Jul 09, 2022
Anodic alumina refers to the surface of aluminum and aluminum alloy is coated with a layer of dense alumina to prevent further oxidation, its chemical properties and alumina the same. However, unlike ordinary oxide film, anodic alumina can be stained by electrolytic staining.
The principle of preparation of
Anodic alumina is prepared by anodic effect (also known as anodizing).
The main performance
Anodic oxidation can significantly improve the corrosion resistance of aluminum alloy, improve the surface hardness and wear resistance of aluminum alloy, after appropriate coloring treatment has good decorative performance. Anodic oxidation film coloring technology of aluminum and its alloy can be divided into 3
Species: chemical dyeing, electrolytic coloring and electrolytic integral coloring. Chemical dyeing is to make use of the porous oxide film layer and chemical activity to adsorb various pigments to make oxide film coloring. According to the coloring mechanism and process, it can be divided into organic dye coloring, inorganic dye coloring, color paste dyeing, chromatic dyeing and achromatic dyeing. Electrolytic coloring is to electrolyze the anodized aluminum and its alloy in an aqueous solution containing metal salts. Metal, metal oxides or metal compounds are deposited at the bottom of the porous layer of the oxide film. Various colors are presented due to the scattering of light by the electrodeposition. Electrolytic integral coloring refers to aluminum and its alloy are colored at the same time of anodic oxidation, which is characterized by one step of oxidation and coloring, coloring film has good light resistance, heat resistance, corrosion resistance and wear resistance. Electrolytic overall coloring is divided into natural hair color, electrolytic hair color and power hair color method, electrolytic hair color is dominant, natural hair color is second, power hair color is under development.
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