This paper reports the influence of low pressure plasma nitriding treatments, some of them followed by plasma assisted oxidation on the mechanical properties and tribocorrosion resistance of a Ti6Al4V alloy. Nitridation was performed for 640 or 720 min at 600 and 700°C in a r.f. plasma equipment, using a N 2-H 2 gas mixture at 7.5 Pa. Some of the samples were then post-oxidized at 700°C for 15 and 60 min, within a O 2 plasma of 9.5 Pa. XRD results revealed the occurrence of the Ti 2 N phase for the nitrided samples. The oxidized surface layers are poorly crystallised with rutile and traces of anatase TiO 2 nanocrystallites. Microhardness tests showed a significant improvement of the surface hardness whatever the treatment, with a slight effect of the treatment temperature. The tribocorrosion results clearly showed that plasma treatments have a strong influence on the tribocorrosion behaviour of the material. Both the corrosion and wear performance of the samples are improved by the increase of the processing temperature.
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