Abstract
The microstructure and crystallographic orientation of aluminum have a significant effect on the morphology of porous alumina films grown on the surface of Al by anodizing. Most existing works regarding the regularities of aluminum anodizing consider metal foils as isotropic media. The novelty of this study lies in the characterization of porous alumina coatings formed on aluminum single crystals with the same orientation, Al(111). Experiments are carried out in 0.3 M oxalic acid in a wide range of anodizing voltages of 20–140 V. Using scanning electron and atomic force microscopy, the dependence on the anodizing voltage of the degree of porous ordering with the formation of a hexagonal array, as well as height-profile parameters of the metal–oxide interface, are shown. The thickness-to-charge ratio for the used anodizing conditions is determined.
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ACKNOWLEDGMENTS
We are grateful to V.K. Ivanov and A.E. Baranchikov (Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences) for the opportunity to analyze samples using electron backscatter diffraction on equipment of the Center of Collective Usage, Physical Methods of Research, Institute of General and Inorganic Chemistry, Russian Academy of Sciences.
Funding
This work was supported by the Russian Science Foundation (project no. 17-73-10473) and the Russian Foundation for Basic Research (project no. 19-33-70091_mol_a_mos) in relation to establishing coefficients relating the thickness of the porous layer to the passed charge density.
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Translated by L. Mosina
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Roslyakov, I.V., Koshkodaev, D.S., Lebedev, V.A. et al. Porous Anodic Alumina Films Grown on Al(111) Single Crystals. J. Surf. Investig. 13, 955–961 (2019). https://doi.org/10.1134/S1027451019050343
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DOI: https://doi.org/10.1134/S1027451019050343