The structure of Ti6Al4 V alloy, its microhardness, surface roughness and corrosion resistance after anodic plasma electrolytic nitrocarburising (PEN/C) in an electrolyte containing carbamide and ammonium chloride were investigated. An X-ray diffractometer and a scanning electron microscopy were used to characterise the phase composition and structure of the modified surface. The effect of processing temperature on the corrosion resistance of the PEN/C samples was examined by means of potentiodynamic polarisation in Ringer's solution. It was found that the PEN/C provides the formation of the external oxide layer (rutile) and a solid solution of carbon and nitrogen in titanium with martensite structure after quenching in the electrolyte. The microhardness of the layer is 740 HV; the surface roughness decreases from 1 to 0.63 μm. Corrosion resistance in Ringer's solution does not deteriorate after anodic PEN/C at low temperature.
The influence of technological parameters of plasma electrolytic nitriding and polishing on the wear resistance and corrosion resistance of medium-carbon steel is considered. The morphology and roughness of the surface, phase composition and microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions with bearing steel as counter-body. It was found that plasma electrolytic polishing removes the loose part of the oxide layer and provides a two-fold decrease in surface roughness compared with untreated steel, and 2.8 times compared with the nitrided one. Combined processing at optimal technological parameters leads to an increase in microhardness up to 1130 HV, an increase in wear resistance by 70 times, and a decrease in the corrosion current density by almost 3 times in comparison with untreated steel.
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