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Corrosion products and mechanism on NiTi shape memory alloy in physiological environment

Published online by Cambridge University Press:  31 January 2011

Tao Hu ,
Chenglin Chu ,
Yunchang Xin ,
Shuilin Wu ,
Kelvin W.K. Yeung  and
Paul K. Chu
Tao Hu
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong
Chenglin Chu*
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong; and School of Materials Science and Engineering, and Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing 211189, China
Yunchang Xin
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong; and School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Shuilin Wu
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong; and China Ministry of Education, Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China
Kelvin W.K. Yeung
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong; and Department of Orthopaedics & Traumatology, The University of Hong Kong, Hong Kong
Paul K. Chu*
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong
*
a)Address all correspondence to this author. e-mail: clchu@seu.edu.cn
b)Address all correspondence to this author. e-mail: paul.chu@cityu.edu.hk
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Abstract

Despite many investigations on the corrosion behavior of NiTi shape memory alloys (SMAs) in various simulated physiological solutions by electrochemical measurements, few have reported detailed information on the corrosion products. In the present study, the structure and composition of the corrosion products on NiTi SMAs immersed in a 0.9% NaCl physiological solution are systematically investigated by scanning electron microscopy (SEM), x-ray energy dispersion spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS). It is found that attack by Cl− results in nickel being released into the solution and decrease in the local nickel concentration at the pitting sites. The remaining Ti reacts with dissolved oxygen from the solution to form titanium oxides. After long-term immersion, the corrosion product layer expands over the entire surface and XPS reveals that the layer is composed of TiO2, Ti2O3, and TiO with relatively depleted Ni. The growth rate of the corrosion product layer decreases with immersion time, and the corrosion product layer is believed to impede further corrosion and improve the biocompatibility of NiTi alloy in a physiological environment. It is found that the release rate of nickel is related to the surface structure of the corrosion product layer and immersion time. A corrosion mechanism is proposed to explain the observed results.

Keywords

CorrosionBiomaterialMetal
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 2 , February 2010 , pp. 350 - 358
Copyright
Copyright © Materials Research Society 2010

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