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Currently an intensive development of technologies is aimed at improving the operational properties of metals and alloys by modifying their surface. One of the most popular and promising for valve metals proceeding is the method of plasma electrolytic oxidation (PEO) 2 . It allows the formation of oxide coatings with enhanced mechanical, corrosive and catalytic properties 3 . Among the advantages of PEO, it is worth noting the non-toxicity of the electrolytes used, the simplicity and compactness of the operating equipment, the absence of a preliminary surface preparation stage, the possibility of processing products of large mass and complex geometry. Changes in the oxidation conditions, the type and composition of the electrolyte, especially the nature of the additive components (dopants), allow us to vary the composition and properties of the formed oxide layers. A significant number of publications in the world and domestic scientific literature indicates the relevance and prospects of research in this area. At the same time, the majority of scientific investigations and developments presented to the general public are aimed primarily at solving limited technological issues and are not systemic in nature, which limits the widespread implementation of PEO in mass production. The presented paper discusses the features of the conversion coatings formation on aluminum and titanium alloys by plasma electrolytic oxidation in alkaline electrolytes. It is devoted to a detailed analysis of the effect of mixed cobalt and/or manganese oxides composition on the morphology,topography and the structure of the surface layers formed by

FUNCTIONAL COATINGS ON VALVE METALS IN SURFACE TREATMENT TECHNOLOGIES