Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/48953
Title: Corrosion susceptibility of implant materials Ti-5Al-4V and Ti-6Al-4Fe in artificial extra-cellular fluids
Authors: Popa, Mihai V.
Demetrescu, Ioana
Vasilescu, Ecaterina
Drob, Paula
Lopez, Agustin Santana
Mirza-Rosca, Julia 
Vasilescu, Cora
Ionita, Daniela
Keywords: In-Vitro
Titanium-Alloys
Physiological Environment
Impedance Spectroscopy
Passive Titanium, et al
Issue Date: 2004
Publisher: 0013-4686
Journal: Electrochimica acta 
Abstract: The paper is aimed at detecting the corrosion susceptibility (generated by the potential gradients, due to the pH changes) of implant materials Ti-5Al-4V and Ti-6Al-4Fe alloys exposed in extra-cellular fluids for long term (10 000 exposure hours) in comparison with pure titanium. The titanium and its ternary alloys exhibited spontaneous passivity in Ringer's solutions of pH = 6.98, 4.35 and 2.5, simulating the real situations that can arise in surgical applications. Potential gradients determined in presumptive extreme pH conditions indicate that there is no probability for local corrosion. Impedance spectra were fitted with one time constant equivalent circuit, typically for protective, compact oxide film. The fitting parameters indicate long-term stability of the passive layers in surgical implant conditions. Atomic force microscopy (AFM) and spectral infrared (IR) data are important arguments in supporting the conclusion that titanium and its ternary alloys have a very good corrosion resistance in long-term functional conditions. (C) 2004 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/10553/48953
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2003.12.036
Source: Electrochimica Acta[ISSN 0013-4686],v. 49, p. 2113-2121
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