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Corrosion study of TI6A14V alloy used such as biomaterial

Abstract:

In the current work the corrosion behavior of a Ti6Al4V alloy was evaluated by linear polarization resistance and potentiodynamic polarization curves, in samples previously exposed to a solution of simulated body fluid (SBF) for 0, 180 and 360 h. The samples were characterized by scanning electron microscopy (S.E.M.) and energy dispersive X-ray spectroscopy (E.D.S.) in order to evaluate the corrosion products and the generated damage. The microstructural characterization revealed the presence of a two-phase microstructure, consisting of an aluminum phase ( α phase) and a vanadium phase ( β phase) located at the grain boundaries. Electrochemical tests showed decrease in the value of the linear polarization resistance in the samples exposed for 360 and 180 h and the presence of a double passive film. The characterization of the corrosion products in the tested samples indicated a preferential attack of the α phase compare respect to phase by pitting corrosion and microgalvanic corrosion.