Corrosion and friction behaviours of MoSi2/MoS2 nanoparticles incorporated tinted coating on Ti6Al4V alloy

A blue tinted coating was fabricated on TC4 alloy employing anodizing treatment with the aim of improving corrosion and wear resistance. Various concentrations of MoS2 or MoSi2 nanoparticles were incorporated into the coatings. The addition of the particles affected the surface roughness, hardness and thickness of the coatings, thus had a comprehensive influence on the wear and corrosion property. The introduction of MoSi2 particles remarkably improved the hardness of the coatings, and improved the wear resistance consequently. The nonconductive MoS2 impeded the penetration of corrosive medium, while conductive MoSi2 introduced additional galvanic couples at the interface which deteriorated the corrosion resistance. Excess concentration of the added particles impeded the growth of oxide layer, resulting in lower corrosion and wear resistance of the coatings.