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Importance of applied normal loads on the tribocorrosion behaviour of Ti-6Al-4V alloy in bio-simulated environment

E. MARDARE1, L. BENEA1,* , J.-P. CELIS2

Affiliation

  1. Dunarea de Jos University of Galati, Metallurgy, Materials Science and Environment Faculty, Competences Center: Interfaces-Tribocorrosion-Electrochemical Systems, 47 Domneasca Street, RO-800008 Galati
  2. Katholieke Universiteit Leuven, Dept. MTM, B-3001 Leuven, Belgium

Abstract

The tribocorrosion behaviour of untreated Ti-6Al-4V alloy in artificial saliva solution was evaluated based on the change in open circuit potential (OCP) measured as a function of time. The experiments were performed using a unidirectional reciprocating fretting experimental set-up which was mechanically and electrochemically instrumented, under various solicitation conditions. The effect of applied normal force on corrosion-wear of the tested material was determined. Before the onset of fretting a large increase of the OCP in the noble direction for the Ti-6Al-4V alloy was observed. With the onset of fretting it was observed a cathodic shift in OCP, shift which decreases linearly with increasing normal load. The restoration ability of Ti-6Al-4V alloy after the passive films damaged during fretting was observed when the fretting motion has ceased. A decrease in friction coefficient with gradually increasing load was observed..

Keywords

Biomedical Ti alloy, Tribocorrosion, Wear, Electrochemistry, Surface micro topography, SEM morphology.

Citation

E. MARDARE, L. BENEA, J.-P. CELIS, Importance of applied normal loads on the tribocorrosion behaviour of Ti-6Al-4V alloy in bio-simulated environment, Optoelectronics and Advanced Materials - Rapid Communications, 6, 3-4, March-April 2012, pp.474-478 (2012).

Submitted at: Jan. 31, 2012

Accepted at: April 11, 2012