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Review of results in anodic plasma electrolytic saturation of structural steels with nitrogen and carbon in the aqueous electrolytes containing ammonia chloride and required additional constituents is presented. Proposed nitrohardening technology of the medium-carbon steels includes the short-time nitrogen saturation with the following hardening in the electrolyte. Short-time anodic carburizing possibility of the low-carbon steels with following hardening is shown. Treatment samples microhardness is 630±30 HV, their surface roughness decreases from 1.2 to 0.22 μm.

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Steel surface can be polished after its plasma electrolytic nitriding using the same electrolyser. Medium carbon steel is nitrided in the aqueous solution containing ammonium chloride and ammonium nitrate under stationary heating at 750°C for 5 min. The surface roughness is shown to decrease from 4.5 to 1.9 µm due to plasma electrolytic polishing during 2 min using the mode of current interruption without changing the structure of the diffusion layers.