Abstract
Aluminum anodizing in electrolytes comprising mixtures of several acids opens way to manufacture porous films of anodic aluminum oxide (AAO) with a widely tunable structure period. Study of thermal transformations in AAO films produced in mixed electrolytes is a separate task, as a complex chemical composition of the material can give rise to some specifics in subsequent annealing. Impurity oxalate and sulfate ions were detected in the AAO produced by aluminum anodizing in sulfuric acid/oxalic acid mixed electrolytes. The sulfate weight fraction appears about one order of magnitude higher than the oxalate weight fraction, and it increases as the concentration ratio of sulfuric acid to oxalic acid in the electrolyte increases. In the same way, the crystallization temperature of amorphous AAO to a mixture of low-temperature Al2O3 polymorphs increases in response to increasing concentration ratio of sulfuric acid and oxalic acid. Thus, the component ratio in the mixed electrolyte used influences the composition and thermal transformations of AAO.
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ACKNOWLEDGMENTS
I.V. Roslyakov, I.V. Kolesnik, and K.S. Napolskii appreciate the support of the “The Future of the Planet and Global Environmental Changes” Interdisciplinary Scientific and Educational School of Moscow State University. The authors are grateful to D.D. Kholmanskikh (Moscow State University) for help in preparing porous AAO films and to T.B. Shatalova (Moscow State University) for her help with the TG/DTA experiments. The instruments of the Joint Research Centre for Physical Methods of Research located in the Kurnakov Institute of General and Inorganic Chemistry RAS were used in the SEM, EDX, and XRD experiments. The TG, DTA, and Fourier-transform IR spectroscopy were implemented on the instruments purchased at the expense of the Moscow State University Development Program.
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The study was supported by the Russian Foundation for Basic Research (project No. 19-33-60088).
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Roslyakov, I.V., Kolesnik, I.V., Belokozenko, M.A. et al. Thermal Transformations of Porous Anodic Aluminum Oxide Formed in Sulfuric Acid/Oxalic Acid Mixed Electrolytes. Russ. J. Inorg. Chem. 68, 923–930 (2023). https://doi.org/10.1134/S003602362360079X
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DOI: https://doi.org/10.1134/S003602362360079X