Abstract-A review of the methods of electrochemical treatment classified as plasma electrolysis is given. Special attention is paid to the physicochemical processes that proceed in electrolytes and the techniques of surface modification and application of protective coatings. The results of investigation of such coatings and surfaces upon electrolytic plasma processing illustrate the efficiency and effectiveness of the method. Being an efficient technique of the surface treatment, which involves both the surface cleaning and plating the coat ing, the plasma electrolytic method is being rapidly developed and adapted for commercial use at present.

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The results of new studies of creating protective oxide coatings based on Al 2 O 3 (Si, Mn) and deposited onto aluminum alloys using electrolyte-plasma oxidation are presented. An analysis is performed by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X ray diffraction, Rutherford backscattering of 4 He + and protons, nanoindentation, scratching, friction coefficient measure ments, and acoustic emission measurements. The results demonstrate that the deposited coatings have a high quality, hardness, and wear resistance and a low thermal diffusivity. Apart from Al 2 O 3 , the coatings are found to have Si, Mn, C, and Ca. The stoichiometry of the coatings is determined. The density and hardness of the coatings are close to those of α Al 2 O 3 in the coating on an Al-Cu (D 16) substrate, and these values of the coating on an Al-Mg (S006) are lower by a factor of 1.5.

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