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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 7/2014

01-07-2014

Corrosion Behavior of Ti-55Ni-1.2Co High Stiffness Shape Memory Alloys

Authors: Xu Huang, Dennis W. Norwich, Michael Ehrlinspiel

Published in: Journal of Materials Engineering and Performance | Issue 7/2014

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Abstract

The corrosion behavior of high stiffness nominal Ti-55Ni-1.2Co (wt.%) shape memory alloys (SMAs) was systematically investigated in the present study including straight wires, wire-formed stents, and laser-cut stents. It was found that the corrosion behavior of Ti-55Ni-1.2Co alloys is comparable with those of binary NiTiNol counterparts, which is attributed to the small alloying amount of cobalt. Additionally, the corrosion resistance of high stiffness Ti-55Ni-1.2Co SMAs is independent of the stent-forming method. To explore the galvanic corrosion susceptibility between Ti-55Ni-1.2Co and binary NiTiNol alloys, a NiTiNol sleeve was laser welded to the Ti-55Ni-1.2Co stent. Interestingly, there is no galvanic corrosion observed in this NiTiCo-NiTiNol component, even after immersion of the component in phosphate-buffered saline solution at 37 °C for three months. This study will shed some light on the industrial applications of high stiffness Ti-55Ni-1.2Co shape memory alloys.
previous article Effect of Surface Alloying by Silicon on the Corrosion Resistance and Biocompatibility of the Binary NiTi
next article Effect of Inclusion Size and Distribution on the Corrosion Behavior of Medical-Device Grade Nitinol Tubing

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Metadata
Title
Corrosion Behavior of Ti-55Ni-1.2Co High Stiffness Shape Memory Alloys
Authors
Xu Huang
Dennis W. Norwich
Michael Ehrlinspiel
Publication date
01-07-2014
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 7/2014
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-014-1014-8

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