AN X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF Ni,Cu-CONTAINING COATINGS FORMED BY PLASMA ELECTROLYTIC OXIDATION ON ALUMINUM AND TITANIUM
E. A. Koblova1, A. Yu. Ustinov1,2, V. S. Rudnev1,2, I. V. Lukiyanchuk1, I. V. Chernykh1
1Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
2Far Eastern Federal University, Vladivostok, Russia
Keywords: рентгеновская фотоэлектронная спектроскопия, атомный состав, химическое состояние, строение поверхности, плазменно-электролитическое оксидирование, металлооксидные покрытия, X-ray photoelectron spectroscopy, atomic composition, chemical state, surface structure, plasma electrolytic oxidation, metal oxide coatings
Abstract
A series of Ni- and/or Cu-containing coatings formed by plasma electrolytic oxidation on aluminum and titanium are examined by X-ray photoelectron spectroscopy. Binding energies of core electrons, elemental composition, chemical state of elements, and features of the structural organization of the surface and near-surface layers of the coatings are determined. A combination of the data collected indicates similar regularities of the composition and significant distinctions in the structure of the coatings formed. It is shown that the coatings formed on titanium are characterized by a considerably higher phosphorus concentration, and correspondingly, phosphates, unlike the coatings formed on aluminum, in which base metal and 3 d element (Ni or Cu) oxides are dominant. In both cases, Cu is mainly concentrated in the surface layers of the coatings whereas Ni is mainly concentrated in the near-surface layers.
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