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Why is the anodic oxide film of aluminum profile green when electrolytic coloring in copper sulfate solution?
Content source: http://huichenglawyer-sy.com/author: Military General; release date: September 27, 2020; 08:46; times of reading: 188 times Click collection

The anodic film of aluminum profile is usually dyed by alternating current electrolysis in copper sulfate solution, which is due to the precipitation of copper in the hole of aluminum profile oxide film. Under certain conditions, the green oxide film can be obtained by electrolytic coloring the anodic oxide film of aluminum profile in copper sulfate solution under specific conditions 0.5g/L copper sulphate -150g/L The green oxide film can be formed by alternating current electrolytic coloring in sulfuric acid mixed aqueous solution - In the mixed solution of copper sulfate, the Aluminum profile Some people think that the formation of green oxide film is due to the formation of copper sulfide, but in theory, the formation of copper sulfide is not tenable;

 Aluminum profile fence

Normal potential -pH As for the influence of anions, the main point of view is: the effect of sulfate radical or sulfur ion; at the same time, we should refer to the specific potential of anion influence -pH Value;


In addition, there are many different electrolytic coloring solutions. According to the types of electrolytic coloring solutions for aluminum profiles, their electrolytic coloring reactions are not the same; copper sulfate solution belongs to the acid solution of single metal salt, during the electrolytic coloring process, it is not only the precipitation of metal ions, but also the change of barrier layer;


In the initial stage of AC electrolytic coloring, the barrier layer of aluminum profile oxide film becomes AC oxide film due to sulfuric acid solution; for a simple electrolytic coloring solution, such as nickel sulfate solution, there is no geometric change, and metal ions are deposited on the barrier layer; for alkaline solution, the dissolution of the barrier layer should be considered;


The deposition mechanism of metal oxy acid solution such as molybdate solution or potassium permanganate solution is not clear Aluminum profile It has been reported that in potassium permanganate solution, manganese is not deposited on the bottom of the hole, but on the whole surface of the hole wall; in a variety of metal salt solutions, or in the use of metal compounds A Solution and B Solution two second two Due to the lack of basic research data, the stage coloring method has not been concluded yet;

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Tianjin Aipu industrial aluminum profile Co., Ltd
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Service hotline: 137021119190 (24-hour service hotline)
Q        Q: five hundred and thirty-four million nine hundred and seventy-three thousand nine hundred and six
Email address: lxc@apas.com.cn
Address: a3-2 Saida international industrial city, Xiqing Economic and Technological Development Zone, Tianjin
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