2, anodic alumina production process
(1) mechanical polishing;
(2) Chemical treatment to remove copper from the surface of some alloys;
(3) cleaning and deoiling;
(4) putting it into dilute sulfuric acid as an anode for electrification to generate a surface oxide layer;
(5) dyeing;
(6) fixed.
Extended data:
Main performance:
Anodizing can significantly improve the corrosion resistance of aluminum alloy, improve the surface hardness and wear resistance of aluminum alloy, and have good decoration after proper coloring treatment.
The coloring technology of anodic oxide film of aluminum and its alloys can be divided into three types: chemical coloring, electrolytic coloring and electrolytic integral coloring. Chemical dyeing uses the porosity and chemical activity of the oxide film to absorb various pigments to color the oxide film. According to the coloring mechanism and technology, it can be divided into organic dye coloring, inorganic dye coloring, paste printing, overprint dyeing and colorless dyeing.
Electrolytic coloring is to electrolyze anodized aluminum and its alloys in an aqueous solution containing metal salts. Metals, metal oxides or metal compounds are deposited on the bottom of the porous layer of the oxide film, which show various colors due to the scattering effect of electrodeposition on light.
Electrolytic integral coloring refers to the coloring of aluminum and its alloys at the same time of anodic oxidation, which is characterized by one-step oxidation coloring. The colored film has good light resistance, heat resistance, corrosion resistance and wear resistance. Electrolytic overall coloring can be divided into natural coloring, electrolytic coloring and powder coloring, among which electrolytic coloring is dominant, natural coloring is second, and powder coloring is developing.
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