Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
Review
Corrosion Behavior of NiTi and Ni-free Ti-based Biomedical Shape Memory Alloys
Hideki Hosoda
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2014 Volume 63 Issue 5 Pages 301-308

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Abstract

Shape memory alloys have become widely applied for biomedical devices such as stents and coils. At present, NiTi is practically and widely used, and Ni-free Ti-based alloys is expected to replace NiTi from the viewpoint of further safety to human body, since the Ti-based alloys do not contain toxic elements such as Ni. This paper summarizes corrosion behavior of NiTi and Ni-free Ti-based biomedical shape memory alloys reported after 1990s. Based on the data in the literature, although the corrosion resistance of both NiTi and Ni-free Ti-base shape memory alloys is judged to be sufficient for biomedical applications, the corrosion resistance of Ni-free Ti-based shape memory alloys is better than that of NiTi. Therefore, from the viewpoint of corrosion, further development of Ni-free Ti-based shape memory alloys is desired.

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© 2014 Japan Society of Corrosion Engineering
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