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What are the factors affecting the oxidation coloring of industrial aluminum profiles?

Update time : 2023-02-01 09:22:05

At present, the application of single color anodized industrial aluminum profiles in practice has been significantly reduced, and based on its electrolytic coloring oxide film, organic coloring oxide film and porcelain oxide film, hard oxide film, imitation stainless steel oxide film has been widely used. For the oxide film coloring technology, the factors affecting the oxidation coloring of industrial aluminum profiles are:
Influence of impurities in electrolytic solution
Industrial aluminum profiles product coloring degree, mostly depends on the formation of oxide film quality. Therefore, in sulfuric acid anodizing solution, the influence of impurities on the oxide film can not be ignored, the impurities are mainly copper, iron, aluminum and other metal ions and organic impurity pollutants, to be removed in time, to maintain the normal range of use of the solution.
1. Copper ions will be replaced and deposited on the surface of aluminum parts, causing loose holes in the oxide film, and reducing transparency, corrosion resistance and electrical insulation performance. Therefore, copper ion content is not allowed to exceed 0.02g/L.
2. Chloride ions come from tap water or cooling water after the rupture of the cooling pipe. The content of chloride ions should be lower than 0.2g/L, otherwise the oxide film generated is rough and loose, and the surface of the aluminum parts will be eroded (breakdown) in serious cases.
3. Aluminum ion electrolyte aluminum ion is gradually increased, when the content is greater than 25g/L, the electrolyte conductivity decreases, the surface of the parts appear white spots or blocky white spots, and make the adsorption capacity of the film layer decreased, dyeing difficult.
4. Iron ions in the iron ion electrolyte are not allowed to exceed 0.2g/L, otherwise dark stripes will appear.
5. Organic impurities will hinder the formation of oxide film, film adsorption of oil, so that the color is not uniform, the appearance of spots.

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