The wear and friction tests showed that the lowest frictioncoefficientandwearrateswereobservedforthesamplesduplextreatedina50%N2+ 50%H2 plasma.Conversely,thelowestwearresistancewasobservedonthesamplesduplex treated in a gas mixture of 75%N2+25%H2, probably due to formation of a hard and brittle layer.