Influence of Normale Loads on Corrosion Behaviour of Ti-6Al-4V Alloy During Fretting in Artificial Saliva
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Date
2012Author
Mardare, Eliza
Benea, Lidia
Celis, Jean-Pierre
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The fretting corrosion 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. Fretting corrosion 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 after the fretting motion ceased. It was
confirmed a decrease in friction coefficient with gradually increasing load. The
morphological features of the fretted zone and the wear mechanism were assessed
using scanning electron microscopy and non-contact optical profilometer.
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- 2012 fascicula9 nr1 [14]