The process of plasma electrolytic nitro-carburizing was carried out in a working chamber, electrolyte flowed over its edge and was cooled with tap water in an outer heat exchanger afterwards. The working chamber, being a cathode, appeared as a cylindrical vessel 98 mm in diameter and 185 mm high. Escaping over the edge of the working chamber, electrolyte flowed into a sump 200 mm in diameter and 230 mm high. Electrolyte flow rate was measured with a floating rotameter and reached 3 l/min.   Three-component aqueous solution containing 5 % ammonium nitrate, 10% ammonium chloride and  carbon-containing component were used as electrolytes. Once carbon-containing component was 5% acetone, in other cases it was 8 % glycerol.     Anode samples had the form of cylindrical workpieces 10 mm in diameter and 15 mm in length made of alpha- and beta-titanium alloy VT22.     The treatment process went as follows: the sample was exposed to the required voltage, afterwards the sample was immersed into electrolyte and was treated for five minutes, then temperature increased as high as 8500 C and power supply was turned off. Thus, all the samples are carburized in the same temperature, differences in the studied properties lie only in the characteristics of their diffusion layers. After plasma-electrolytic nitrocarburizing, tribological, corrosion and metallographical tests were performed. Tribological characteristics were measured with  a tribometer with a a disc made of 45 steel hardened to 55 HRC, 200 mm in diameter and 20 mm in thickness used as counterbody. The test was performed under normal load for the sample 156.5 H and at slipping speed 0.49 m/s.     Comparative analysis of corrosive resistance of the samples was carried out  using the potentiostat- galvanostat bio-logic SP 150. prior to registration of polarization curves, the samples were held in corrosion environment, that is in Ringer's solution. Potentiodynamic curves were registered at scanning rate of 1 mV/s in the range from 300 to 300 mV, in respect to open-circuit potential. Corrosion current density was found through extrapolation method after Tafel with the help of ECLab programme using cathode and anode regions of the polarization curve.     Metallographical test was carried out with a microhardness tester and metallographic microscope with an installed video-control.  Experimental data confirm that the process of pasma-electrolytic nitrocarburizing with the subsequent hardening in the electrolytes listed above, results in the formation of a hardened outer diffusion layer 50 mc in thickness. Highest microhardness values are observed at saturation under 9000 C (800 HV) for acetonic electrolyte and at 7500 C (650 HV) for glycerol electrolyte. The influence of the temperature on the friction coefficient was not found for both electrolytes, but in all cases the value  is 2-3 times lower compared to untreated samples. Corrosion tests showed that the lowest corrosion current density was possible at 7000 C for acetonic electrolyte (9.2 McA/cm) and at 7500 C for glycerol electrolyte (0.16 mcA/cm).     This work was financially supported by the Russian Science Foundation (Contract No. 15-1920027) to the Nekrasov Kostroma State University.