Abstract
Plasma-electrolytic oxidazing of titanium alloy in alkaline electrolytes with additions of refractory metal compounds produced heteroxide coatings of microglobular morphology with high adhesion. In the role of dopants, nanosized vanadium, zirconium and molybdenum oxides dispersed in the electrolyte, as well as solutions of sodium tungstate, which allowed the formation of heteroxide coatings of both colloidal and true solutions, are used. The effect of the dopants on the process parameters is determined and the overvoltage intervals corresponding to the microarc regime are revealed. Based on the results of scanning electron and atomic force microscopy, it was shown that the chemical composition of the coatings, surface topography and grain size can be controlled by varying the electrolyte concentration and the current density of the plasma-electrolytic oxidazing process. It has been found that the formed oxide layers have a high resistance to abrasion and significantly increases the corrosion resistance of titanium in chloride-containing media due to the incorporation of refractory components and smoothing of the surface relief.
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Schedule a callMore From: Bulletin of the National Technical University "KhPI". Series: Chemistry, Chemical Technology and Ecology
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