Abstract
The chapter is devoted to the study of morphology, topography, and fractality of heterooxide coatings formed on common structural materials—mild steel and aluminum alloys. The aim of the work was to investigate the regularities of changes in the characteristics of surface layers depending on the method of electrosynthesis and their influence on the properties of the obtained functional materials. Rational modes of electrolysis for the formation of coatings enriched with the target dopant component are substantiated. In particular, it is shown that varying the type of polarization (direct or pulsed current) makes it possible to control the molybdenum content in the Fe–Co–MoOx coatings within the range of 18–38 at. %. The synthesis of heterooxide coatings Al2O3 · CoOx (MnOy) with a content of cobalt up to 24 at. % and manganese up to 36 at. % should be carried out by plasma electrolytic oxidation in the mode of “decreasing power” with the current density of 3–20 A/dm2. According to the results of research, it is shown that the indicators of roughness and fractality are influenced by the method of synthesis of electrochemical coating and the composition of the processed material. The fractal dimension of Fe–Co–MoOx coatings formed by direct current varies in the range of 2.05–2.64 and in the range of 2.47–2.69 for coatings formed in the pulse mode. Moreover, the values of D depend on the scanning area of the selected area. Thus, local surface alignment is observed during the transition to nanoscale relief. For oxide coatings on aluminum, an increase in fractality during the incorporation of cobalt and manganese into the surface layers has been established.
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Yermolenko, I.Y., Karakurkchi, H.V., Ved, M.V., Sakhnenko, N.D. (2021). The Investigation of Morphology, Topography, and Surface Fractality of Heterooxide Composite Coatings. In: Fesenko, O., Yatsenko, L. (eds) Nanomaterials and Nanocomposites, Nanostructure Surfaces, and Their Applications . NANO 2020. Springer Proceedings in Physics, vol 263. Springer, Cham. https://doi.org/10.1007/978-3-030-74741-1_31
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