Tribo-corrosion is defined as the degradation of materials that results from synergy of mechanical and electrochemical processes. A new apparatus was designed and built in order to study tribo-corrosion behavior of materials. This technique use an electrochemical set-up of the three-electrode type for controlling the potential of the surface of a conducting material subjected to rubbing in a tribometer. In this way it is possible to carry out friction and wear tests in electrolytic solution under well-defined electrochemical conditions determined by the applied electrode potential. In this paper, description of this apparatus was presented and the effect of PE-CVD DLC coatings on corrosion and tribo-corrosion behavior of 316L stainless steel under simulated body fluid condition was investigated. Potentiodynamic polarization tests have shown that DLC coated surfaces present higher corrosion potential (E_corr) and breakdown potential (E_b) than bare surfaces. The charge transfer resistance (R_ct) measured using electrochemical impedance spectroscopy (EIS) was also higher for the DLC coated surfaces. Porosity of DLC coated surfaces were shown to be critical for corrosive wear resistance.

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