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The Influence of the Structure of Azo Compounds on the Deposition Process and the Quality of Copper Coatings on Anodized Aluminum Alloys

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Inorganic Materials: Applied Research Aims and scope

Abstract

A comparative analysis of the influence of the structure of azo compounds (by the example of methyl red (MKR) and nitroso-r salt (NRS)) during copper plating of anodized aluminum alloys on the microstructure, micro-roughness, and quality of deposited copper coatings was carried out. It is shown that the choice of azo dye significantly depends on the charge of the surface of the oxide film in the solutions used. It is shown that the applied dyes should have at least two functional groups in their composition, one of which should provide the formation of complexes with copper ions, and the other should provide their adhesion to the surface of the oxide film due to the forces of electrostatic interaction. The adsorption of azo compounds changes the structure of the double electric layer at the film–electrolyte interface, which affects the speed of the copper plating process. At the same time, the mobility of the formed complexes in the adsorption layer increases, which leads to a better opening of the film surface. The studied indicators (dyes) positively affected the structure of the copper coating (eliminated defects and made it fine-crystalline) and also significantly smoothed the surface of the copper coating. The advantage of using NRS over the MKR was revealed, which made it possible not only to obtain a high-quality coating but also to significantly intensify the copper plating process. A new composition of copper sulfuric acid electrolyte for coating anodized aluminum alloys at elevated cathode current densities with preservation of fine-crystalline structure and smoothed surface is proposed.

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Authors and Affiliations

  1. Nizhny Novgorod State Technical University, 603950, Nizhny Novgorod, Russia

    T. I. Devyatkina, R. V. Taranets, V. V. Rogozhin & V. V. Isaev

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  1. T. I. Devyatkina
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  2. R. V. Taranets
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  3. V. V. Rogozhin
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  4. V. V. Isaev
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Correspondence to T. I. Devyatkina.

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Translated by K. Gumerov

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Devyatkina, T.I., Taranets, R.V., Rogozhin, V.V. et al. The Influence of the Structure of Azo Compounds on the Deposition Process and the Quality of Copper Coatings on Anodized Aluminum Alloys. Inorg. Mater. Appl. Res. 14, 1414–1421 (2023). https://doi.org/10.1134/S2075113323050088

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