Delgado-Alvarado, Carolina

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    A study of the corrosion resistance of gamma titanium aluminide in ringer's solution, 3.5 WT% NaCI and seawater
    (2005) Delgado-Alvarado, Carolina; Sundaram, Paul A.; College of Engineering; Pérez, Néstor L.; Suárez, O. Marcelo; Department of Mechanical Engineering; Colucci, José A.
    Corrosion resistance is one of the essential requirements that determine the application of a metallic alloy as a biomaterial. The titanium alloy, gamma titanium aluminide (γTiAl), widely known for its low density, high strength-to-weight ratio, high stiffness, and strength was evaluated for room temperature corrosion resistance in this research to determine its viability as a biomaterial. For this purpose, two fundamental electrochemical techniques namely Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Anodic Polarization (PAP). were used to evaluate the corrosion performance of γ-TiAl, in Ringer's solution, 3.5% NaCl, and seawater. Ti-6Al-4V alloy, a popular biomaterial, was used as comparison. Surface modification treatments were employed with the purpose of improving corrosion resistance. The samples were oxidized at 500°C, 800°C, and autoclaved at 121°C and 15 psi. A scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to characterize the samples. In general, the results of the potentiodynamic anodic polarization were found to be in good agreement with those of EIS analyses. The results obtained for γ-TiAl and Ti-6Al-4V were very similar. The presence of the oxide layer formed with the surface treatments increased their corrosion resistance. The low values of corrosion rate (CR), and the high values for corrosion potential (Ecorr) and polarization resistance (Rp) obtained experimentally implies that γ-TiAl can be competitively considered as an alternative metallic biomaterial.