Electrolytic-Plasma Polishing of Titanium Alloy Ti6Al4V Additive Manufacturing Products

А possibility is shown of using plasma electrolytic polishing as a technology for postprocessing of additively manufactured alloy products, which ensures a change in the surface microrelief as a result of anodic dissolution and the action of pulsed spark discharges, removal of unmelted powder particles adhesively bound to the substrate from the surface, and a decrease in its roughness and an accompanying increase in wear resistance. Polishing was carried out under conditions effectively shown for treatment products made of titanium alloys obtained by the traditional method. An aqueous solution at 80°C based on ammonium fluoride with the addition of citric acid and pyrocatechol as complexing agents was used as an electrolyte. It was found that treatment at a voltage of 300 V for 20 min reduces the height roughness parameters Ra and Rz by an order of magnitude. Tribological tests were conducted in the dry friction mode using the shaft-bushing scheme under a load of 10 N. At a sliding speed of the sample on a counter body made of hardened tool steel of 1.555 m/s per 1000 m of friction path, there is a decrease in weight wear by 1.8 and 1.9 times and the friction coefficient by 10 and 42%, respectively. Improvement of antifriction characteristics is ensured after polishing for 15 and 20 min by the formation of a self-reproducing stable microrelief with high load-bearing capacity of a rough profile under friction, with the leading role of the oxidative wear mechanism.