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Corrosion behavior of biomedical AZ91 magnesium alloy in simulated body fluids

Published online by Cambridge University Press:  31 January 2011

Yunchang Xin ,
Chenglong Liu ,
Xinmeng Zhang ,
Guoyi Tang ,
Xiubo Tian  and
Paul K. Chu
Yunchang Xin
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China; and Advanced Materials Institute, Tsinghua University, Shenzhen Graduate School, Shenzhen 518055, People’s Republic of China
Chenglong Liu
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China
Xinmeng Zhang
Affiliation:
State Key Laboratory of Welding Production Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Guoyi Tang*
Affiliation:
Advanced Materials Institute, Tsinghua University, Shenzhen Graduate School, Shenzhen 518055, People’s Republic of China
Xiubo Tian
Affiliation:
State Key Laboratory of Welding Production Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Paul K. Chu*
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: tanggy@mail.sz.tsinghua.edu.cn
b) e-mail: paul.chu@cityu.edu.hk
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Abstract

Fast degradation rates in the physiological environment constitute the main limitation for magnesium alloys used in biodegradable hard tissue implants. In this work, the corrosion behavior of AZ91 magnesium alloy in simulated body fluids (SBF) was systematically investigated to determine its performance in a physiological environment. The influence of the main constituent phases on the corrosion behavior was studied by in situ visual observation and scanning electron microscopy. Energy dispersive x-ray spectrometry and Fourier transfer infrared spectroscopy revealed that both calcium and magnesium phosphates are present in the corroded products besides magnesium oxide. Electrochemical methods including open circuit potential evolution and electrochemical impedance spectroscopy were used to investigate the mechanism. The corresponding electrode controlled processes and evolution of the corrosion products layer were discussed. The degradation rate after immersion in SBF for seven days was calculated from both the weight loss and hydrogen evolution methods.

Keywords

AlloyBiomaterialCorrosion
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 7 , July 2007 , pp. 2004 - 2011
Copyright
Copyright © Materials Research Society 2007

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