Abstract
Chronopotentiometry and potentiodynamic voltammetry simulated were used to study the electrochemical behavior of the new pseudoelastic medical Ti-Nb-Ta alloy in simulated physiological media (neutral and acidified Hank’s solution, artificial saliva) at temperatures of 37 and 50°C as compared to titanium and nitinol. The mechanism of formation of protective passive films on the alloy surface is proposed on the basis of analysis of kinetic regularities used to establish steady-state potentials during exposure to the corresponding solutions. X-ray photoelectron spectroscopy technique was used to study the composition of passivating layers on the surface of the Ti-Nb-Ta alloy after corrosion tests. It is found that the new alloy is as good as titanium as regards its corrosion-electrochemical characteristics and is not subjected to pitting corrosion, as opposed to nitinol.
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