Long-Term Corrosion Behavior of Biocompatible Beta-Type Ti Alloy in Simulated Body Fuid
| Title in English | Long-Term Corrosion Behavior of Biocompatible Beta-Type Ti Alloy in Simulated Body Fluid |
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| Authors | |
| Year of publication | 2012 |
| Type | Article in Periodical |
| Magazine / Source | Journal of the electrochemical society |
| MU Faculty or unit | |
| 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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