Electrolytic-plasma processes are new highly efficient and environment friendly processing techniques of metals and alloys; they could be applied for polishing and cleaning of the metal surfaces, for thermal and chemical-thermal treatment. The present work is related to the study of modes, established on the active electrode made from aluminum during the anodic process and using of these modes for polishing of its surface, and also for the synchronous polishing of the anode surface and coating removing from the surface of the copper-plated cathode. The copper content and surface roughness of the metal before and after treatment were evaluated by means of the profilometry and energy-dispersive Xray analysis (EDAX). The composition, microstructure and morphology of the copper coating removed from the cathode surface have been studied depending on treatment parameters. The results show that electrolytic-plasma processes can be effectively used for polishing of the surface of aluminum, simultaneous polishing of the aluminum anode and removing of the copper coating from the cathode.

Electrolytic -plasma processes (EPP), which are a set of electrochemical and electro physical phenomena, are new highly effective and environmentally friendly methods of metals and alloys surface treatment. Electrolytic -plasma treatment of metal surfaces could be used for cleaning and polishing of metal surfaces, formation of diffusion layers (thermo chemical treatment) and metal, ceramic or composite coating deposition (micro-arc oxidation). The present paper is related to the study of modes set on the active electrode during anodic process and usage of these modes in descaling, metal surface polishing and synchronous polishing of anode surface and coating of cathode surface. Oxygen content and surface roughness before and after the treatment were evaluated according to the profile logging and energy dispersive X-ray analysis (EDAX). Composition, microstructure, morphology and adhesion of copper and silvers coatings formed on cathode surface during electrolytic -plasma treatment were studied depending on treatment parameters. Results show that electrolytic -plasma processes can be used effectively for steel strips descaling after rolling; metals and alloys surface polishing, synchronous anode polishing and cathode coating.

Nitrogen pressure during melting can be a basis for the most general classification of steels alloyed by nitrogen. Nitrogen steels are made under normal pressure, and high‐nitrogen steels are made under pressure, being higher atmospheric in special units. Nitrogen, as well as carbon, strengthens and increases the thermal stability of austenite. The smaller size of the nitrogen ion compared with carbon results in smaller nitrides, lower surface energy and higher strengthening effect, and the ability to increase both the strength and corrosion resistance of austenite. Herein, the mechanisms of the influence of nitrogen on the properties of steel, the thermodynamics and kinetics of alloying with nitrogen, the critical concentration of nitrogen, and the influence of nitrogen on the properties of steels are considered. Examples of nitrogen and high‐nitrogen steels, including weld joints, steels with special properties, such as corrosion‐resistant steels in bioactive environments, bactericidal steel, and steels alloyed by C + N, are given.

This article briefly reviews modern methods for oxidizing coating of valve metals (Al, Ti, Mg, etc.). These methods include microarc oxidation, plasma-electrolytic-arc oxidation, anodic -spark oxidation. Their common characteristics as well as differences between these methods and electrolyte-plasma processing by electrohydrodynamic mode of anodic process are described. The composition, microstructure and surface morphology of the coating formed on the surface of titanium alloys depending on the electrolyte-plasma processing parameters are investigated.

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