Corrosion and fretting corrosion of boride coating on Ti-6Al-4V (TAV) are investigated in Ringer's solution for bio-implant applications. Boride coatings are fabricated as a function of temperature (900-1100 degrees C) and soaking time (1-5 h). Coatings are characterized for phase evaluation, microstructural analysis, thickness and microhardness measurement. The coating contained TiB2 and TiB whiskers as outermost and inner layers respectively. The increasing thickness of outer TiB2 at a relatively higher boriding temperature and time impeded the TiB formation. A large microhardness value of similar to 3248 Hv(15gf) at the outermost surface (< 5 mu m) is mainly attributed to TiB2 layer. Anodic polarization and electrochemical impedance spectroscopy (EIS) studies reveal improvement in the corrosion resistance of coating produced at increased temperature and time of boriding, yet remained lower than the resistance of bare TAV alloy. The formation of B2O3 and absence of Al2O3 on the surface, as investigated by X-ray photoelectron spectroscopy (XPS), are attributed to an inferior corrosion resistance of the bonded TAV. The increase in corrosion resistance with the TiB2 coating thickness is attributed to thickening of the inner passive film formed on bonded TAV. A large decrease in fretting damage after boride coating is due to the decline in a synergistic parameter. (C) 2017 Elsevier B.V. All rights reserved.