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Effect of pH value on the corrosion and corrosion fatigue behavior of AM60 magnesium alloy

Published online by Cambridge University Press:  11 February 2019

Yuxian Meng ,
Hong Gao ,
Jiaqi Hu  and
Lilan Gao
Yuxian Meng
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Hong Gao*
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Jiaqi Hu
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Lilan Gao*
Affiliation:
School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300191, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

To understand the effect of pH value on the corrosion and corrosion fatigue behavior of AM60 magnesium alloy, electrochemical tests, viz., electrochemical impedance spectroscopy (EIS) and fatigue tests, were carried out in PBS (phosphate buffered saline) solutions of pH 5.2, 7.4, and 9.0. The microstructure was investigated by scanning electron microscopy (SEM). Results are as follows: (i) the corrosion mechanism of AM60 under different pH values was different according to EIS; (ii) the corrosion resistance and corrosion fatigue life reduced in the following order: pH 9.0 > pH 7.4 > pH 5.2; (iii) the crack initiation was associated with hydrogen embrittlement of AM60 on the basis of fractographic analysis.

Keywords

magnesium alloycorrosion fatiguepH effectEIShydrogen embrittlement
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 6 , 28 March 2019 , pp. 1054 - 1063
Copyright
Copyright © Materials Research Society 2019 

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