Long-Term Corrosion Behavior of Biocompatible Beta-Type Ti Alloy in Simulated Body Fuid

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Title in English Long-Term Corrosion Behavior of Biocompatible Beta-Type Ti Alloy in Simulated Body Fluid
Authors

TSUTSUMI Y. BARTÁKOVÁ Sonia PRACHÁR Patrik YALATU S. MIGITA S. DOI H. NOMURA N. HANAWA T.

Year of publication 2012
Type Article in Periodical
Magazine / Source Journal of the electrochemical society
MU Faculty or unit

Faculty of Medicine

Citation
Web abstrakt_zde
Doi http://dx.doi.org/10.1149/2.045210jes
Field ORL, ophthalmology, stomatology
Keywords Titanium; Niobium; Tantalum; alloy
Description The corrosion behavior of the Ti-33.5Nb-5.7Ta alloy (Ti-Nb-Ta) as a biocompatible Beta-type Ti alloy during long-term immersion in simulated body fluid was investigated. Like pure Ti, pitting corrosion did not occur on Ti-Nb-Ta during anodic polarization. Thus, alloying of Ti with Nb and Ta did not change the chloride-ion sensitivity. Metal ion release of Ti, Nb, and Ta was detected after 7-d immersion in the solution; however, the amounts of ions were much smaller than those from Type316L stainless steel. X-ray photoelectron spectroscopy revealed that the fractions of Nb and Ta in the passive layer increased during the immersion while that of Ti decreased. The corrosion rate of Ti-Nb-Ta determined by electrochemical impedance spectroscopy kept decreasing over a period of 15 d while the thickness of the passive layer did not change after 1 d. Thus, the reconstruction of the passive layer of the alloy was proven to be important for metal ion release during long-term implantation in a living body. Thus, Ti-Nb-Ta has sufficient corrosion resistance as a biocompatible Beta-type Ti alloy.
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