Improvement of surface properties of pure titanium (CP-Ti) and titanium alloy (Ti-6Al-4V))

Titanium and its alloys, high strength / weight ratio, low density, good corrosion resistance and biocompatibility properties due to automotive, aerospace, marine, biomedical, chemistry and so on. used in such industries. However, their low wear resistance combined with high friction coefficients limit the engineering applications of titanium and its alloys. For this reason, various surface modification processes are applied to titanium and its alloys in order to improve the wear properties. The main purpose of this study is to improve the surface properties of commercial pure titanium (CP-Ti) and titanium alloy (Ti-6Al-4V). While the surface of the CP-Ti is coated with a current-free Ni-B, on the surface of the Ti-6Al-4V alloy, a pulse-flow (PC) electrodeposition method is used to form graphene (0,1 g/l ve 0,2 g/l) composite coatings in nickel and different contents. Surface morphology, microstructure and phase analysis were analyzed by Scanning Electron Microscope (SEM), Optical Microscope (OM) and X-Ray Diffraction (XRD) equipped with Energy Divided X-ray Spectroscopy (EDS), respectively. The obtained Ni-B coating and the graphene composite coating in different contents exhibited a significantly lower wear rate, stable coefficient of friction and high hardness compared to untreated CP-Ti and Ti-6Al-4V alloy.