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Hard oxidation color control of pure aluminum and aluminum alloys

August 17, 2023
Hard oxidation and ordinary anodizing of pure aluminum can obtain 20% of the porosity, and the porosity of alloy aluminum increases. Ordinary anodizing treatment, oxide film thin layer with a large number of microholes, can absorb a variety of lubricants, suitable for the manufacture of engine cylinders or other wear-resistant parts; Part of the content is also we must learn and master, so that we can increase the amount of knowledge, the anodizing temperature increased to 10-20℃, which is different from the anodizing of aluminum alloy under industrial heat treatment, the characteristics of the obtained oxide film are similar to sulfuric acid anodizing film. After cleaning, the aluminum alloy substrate is subjected to hard anodized treatment at a temperature of 4℃ ~ 13℃ to form a hard oxidation film on the surface of the aluminum alloy. Ordinary anodizing about 18-22℃, with additives can reach 30℃, the temperature is too high easy to appear powder or crack; Hard oxidation is generally below 5 ° C, relatively speaking, the lower the temperature, the higher the hardness.
The common coloring methods in this field include organic dye dyeing, electrolytic coloring and other coloring methods, but the existing coloring methods are for the ordinary anodic oxidation film surface coloring treatment, found timely dyeing, if this situation has occurred, the workpiece can be placed in the anodic oxidation dyeing tank or nitric acid neutralization tank appropriate activation treatment before dyeing. Anodizing is a very common and very basic surface treatment process, after the oxidation treatment of dyeing materials can be dyed any color you want, hard oxidation is just a thick oxide film, hard oxidation, ordinary anodizing is widely used in aluminum alloy, titanium alloy and magnesium alloy fields. Under certain specific technical conditions to be oxidized, on its surface can also form a imitation glaze film, so that hard oxidation of aluminum products, ordinary anodized surface to obtain special decorative effect.
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