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The research work aims at improving biomaterials surface properties by Co/nano-CeO 2  composite layers obtained by electro-codeposition method from a cobalt sulphate solution containing CeO 2  dispersed nanoparticles. The thicknesses of pure cobalt and Co/CeO 2  hybrid nanocomposite layers are measured versus applied current density and time of the plating process. The tribocorrosion properties of Co/nano-CeO 2  hybrid nanocomposite layers and pure Co layer obtained were comparatively investigated friction sliding tests in a unidirectional tribometer in lubricating conditions using biological solution (Hank). During the tribocorrosion test, the normal force, tangential force, coefficient of friction, number of cycles as well as the electrochemical parameter (potential), were continuously monitored. The results show that the wear - corrosion (tribocorrosion) behavior of Co/nano-CeO 2  hybrid nanocomposite layers are closely related with dispersed reinforcing nano-CeO 2  content. The hybrid nanocomposite layers with all CeO 2  content shows increased wear - corrosion resistance as compared with pure Co layer, by decreasing wear volume loss with increasing nano-CeO 2  particles dispersed into plating electrolyte.

Wear-corrosion response of Cerium oxide reinforced Cobalt hybrid composite layers in biological solution