AbstractSputtered MoS2 coatings have been mostly used as a solid lubricant. In this investigation, MoSx/Ni composite coatings with Ni contents varying from 0 to 22 % were deposited onto steel substrate using a DC magnetron sputter process. The MoS2/Ni ratio in the coatings was controlled by sputtering the composite targets. The composition, microstructure, and mechanical properties of the coatings were explored using an energy dispersive analysis of X-ray (EDX), Xray diffraction (XRD), nano indentation, and scratch techniques. The tribological behavior of the coatings was investigated using the pin-on-disc test at room temperature. The nickel doping in MoS2–Nix% coatings improves their mechanical properties, cohesive strength and tribological properties. The films exhibited a steady state friction coefficient from 0.13 to 0.19 and the main wear mechanisms of the MoSx/Ni coating in air were abrasive, adhesive, and oxidation wear.Keywords: MoSX/Ni coating; Tribological properties; PVD ; Low friction; Solid lubricant; Low friction; Solid lubricant Manuscript profile

Surface modification is very important in the component in industry due to wear and corrosion. In order to improve the corrosion behavior of steels, a protective coating can be deposited onto the surface. In this study Ni-TiO2 coatings were prepared on an AISI 430 stainless steel substrate by electrocodeposition process in Watt’s plating bath containing TiO2 particles. Two types of coatings was produced; without CTAB and at presence of CTAB surfactant. Isothermal oxidation behavior of uncoated and two types of coated specimens were studied up to 250 h in 800 ºC. Also cyclic oxidation was studied for 100 cycles at 800 C. Scanning electron microscope (SEM) and X-ray systems were applied in order to investigate the formed phases and structures of composite coating before and after oxidation. Results showed coated specimens at presence of CTAB surfactant had lower mass gain compared to Ni-TiO2 coated and uncoated ones after isothermal and cyclic oxidation at 800 ºC. Manuscript profile