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Assessment of Corrosion Resistance and Metal Ion Leaching of Nitinol Alloys

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Abstract

Nitinol usage for biomedical implant devices has received significant attention due to its high corrosion resistance and biocompatibility. However, surface treatments are known to affect surface charge, surface chemistry, morphology, wettability, and corrosion resistance. In this investigation, the corrosion resistance of a binary and various ternary Nitinol alloys was determined after being subjected to electropolishing, magnetoelectropolishing, and water boiling and passivation. Cyclic polarization in vitro corrosion tests were conducted in Phosphate Buffer Saline (PBS) in compliance with ASTM F 2129-08 before and after surface treatments. The concentrations of dissolved metal ions in the electrolyte were also determined by ICPMS.

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Acknowledgments

The project described was supported by Award Number SC3GM084816 from the National Institute of General Medical Sciences.

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Correspondence to Waseem Haider.

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This article is an invited paper selected from presentations at Shape Memory and Superelastic Technologies 2010, held May 16-20, 2010, in Pacific Grove, California, and has been expanded from the original presentation.

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Haider, W., Munroe, N. Assessment of Corrosion Resistance and Metal Ion Leaching of Nitinol Alloys. J. of Materi Eng and Perform 20, 812–815 (2011). https://doi.org/10.1007/s11665-011-9892-5

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  • DOI: https://doi.org/10.1007/s11665-011-9892-5

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