31 May 1999 Surface characteristics of sterilized electropolished NiTi shape memory alloy as biomaterials
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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.
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Maryam Tabrizian, Maryam Tabrizian, Benjamin Thierry, Benjamin Thierry, Omarou Savadogo, Omarou Savadogo, L'Hocine Yahia, L'Hocine Yahia, } "Surface characteristics of sterilized electropolished NiTi shape memory alloy as biomaterials", 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; https://doi.org/10.1117/12.349719

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