Tribocorrosão da liga TI6AL4V em solução salina tamponada com fosfato

Abstract

The tribocorrosion behavior of Ti6Al4V alloy was investigated in a Phosphate Buffered Saline (PBS) solution by a reciprocating wear, using alumina ball as the counterface material, at different normal forces and sliding velocities. Dry wear experiments were performed in order to compare with the tribocorrosion experiments at open circuit potential and under anodic polarization. Dry wear induced a superior damage on the counterface, forming larger and shallower wear tracks compared with those experiments performed in PBS solution. The anodic current was increased by wear; however the volume of oxidized metal in tribocorrosion experiments correspond to a relative low percentage of the wear track volume

Tribological, electrochemical and tribo-electrochemical characterization of bare and nitrided Ti6Al4V in simulated body fluid solution

“…Bare alloy presents a lowering in the corrosion potential and higher current densities due to the continuous removal of the surface passive film. When the alumina ball wears the surface, the passive oxide film is locally destroyed exposing the alloy to fresh electrolyte and causing a lowering of the corrosion potential as verified in other similar systems [8,12,22,23]. Despite the passive layer removal with some possible incipient dissolution, no corrosive process follows due to the rapid repassivation, as deduced from current density oscillations.…”

Corrosion, wear and wear–corrosion behavior of graphite-like a-C:H films deposited on bare and nitrided titanium alloy

“…This choice is motivated by titanium appropriate properties such as low density, high strength to weight ratio, good corrosion resistance, and above all, biocompatibility which is conferred by the thin and compact oxide (TiO 2 ) spontaneously formed at its surface in the presence of oxygen [1][2][3]. However, in some applications (in ankle and hip joints, for instance) superior mechanical wear and, mainly, wear-corrosion resistance are required, but not provided by those metals [4,5]. To extend the use of titanium to situations where superior resistance is required, researchers have been working to improve the surface properties of titanium and its alloys through mechanical, chemical, thermo-chemical processes and/or coating deposition [6][7][8][9][10].…”

Corrosion resistance improvement of titanium base alloys

“…[1][2][3][4][5][6] These materials have very good corrosion resistance and biocompatibility. In the last years, important problems have been raised over their long-term performance.…”