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Corrosion Kinetics of Laser Treated NiTi Shape Memory Alloy Biomaterials

Published online by Cambridge University Press:  10 February 2011

F. Villermaux ,
I. Nakatsugawa ,
M. Tabrizian ,
D. L. Piron ,
M. Meunier  and
U'H. Yahia
F. Villermaux
Affiliation:
Biomaterials-Biomechanics Research Group, Institute of Biomedicai Engineering, Ecole Polytechnique of Montreal, C.P. 6079, Suce centre-ville, Montreal, Quebec, Canada, H3C 3A7
I. Nakatsugawa
Affiliation:
Institute of Magnesium Technology, 357 rue Franquet, Ste-Foy, Quebec, Canada, GIP 4N7
M. Tabrizian
Affiliation:
Biomaterials-Biomechanics Research Group, Institute of Biomedicai Engineering, Ecole Polytechnique of Montreal, C.P. 6079, Suce centre-ville, Montreal, Quebec, Canada, H3C 3A7
D. L. Piron
Affiliation:
Department of Metallurgy, Ecole Polytechnique of Montreal, C.P. 6079, Succ centre-ville, Montreal, Quebec, Canada, H3C 3A7
M. Meunier
Affiliation:
Department of Engineering Physics, Ecole Polytechnique of Montreal, C.P. 6079, Succ centre-ville, Montreal, Quebec, Canada, H3C 3A7
U'H. Yahia
Affiliation:
Biomaterials-Biomechanics Research Group, Institute of Biomedicai Engineering, Ecole Polytechnique of Montreal, C.P. 6079, Suce centre-ville, Montreal, Quebec, Canada, H3C 3A7
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Abstract

NiTi shape memory alloy presents interesting mechanical properties as surgical implants. However, due to its high amount of Ni which may dissolve and release toxic ions in human fluids, the medical use of this material is a great concern. We have developed a laser treatment which modifies the oxide layer and enhances uniform and localised corrosion resistance of NiTi alloy.

In this paper we further analysed the effect of this treatment with potentiostatic and AC impedance measurements in physiological Hank's solution. We conclude that the laser treatment creates a stable passive film which results in improved corrosion resistance of this alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 477
Copyright
Copyright © Materials Research Society 1997

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References

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