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Proceedings Paper

Surface characteristics of sterilized electropolished NiTi shape memory alloy as biomaterials
Author(s): Maryam Tabrizian; Benjamin Thierry; Omarou Savadogo; L'Hocine Yahia
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Paper Abstract

As a potential biomaterial for many medical applications, NiTi alloy derives its good biocompatibility and corrosion resistance from a homogeneous and protective oxide layer, mainly composed of TiO2, with little concentration of nickel. However, during corrosion testing at high potential, NiTi is susceptible to pitting corrosion, which may affect the amount of ions (nickel and titanium) released by the alloy and thus, may affect its biocompatibility. As a passivating treatment, electropolishing (EP) was demonstrated to decrease the amount of nickel on the surface and to remarkably improve the corrosion behavior of the alloy. After sterilization by ethylene oxide (EO), no modification of the promising corrosion behavior of electropolished NiTi were observed, although some surface modifications were reported. The corrosion resistance of ethylene oxide sterilized and electropolished samples ranked between that of the commonly used Ti6A14V and 316L (0.4 less than 1 less than 1.4 mV/SCE) implant alloys.

Paper Details

Date Published: 31 May 1999
PDF: 9 pages
Proc. SPIE 3670, Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (31 May 1999); doi: 10.1117/12.349719
Show Author Affiliations
Maryam Tabrizian, Ecole Polytechnique de Montreal (Canada)
Benjamin Thierry, Ecole Polytechnique de Montreal (Canada)
Omarou Savadogo, Ecole Polytechnique de Montreal (Canada)
L'Hocine Yahia, Ecole Polytechnique de Montreal (Canada)


Published in SPIE Proceedings Vol. 3670:
Smart Structures and Materials 1999: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman, Editor(s)

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