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Effect of Zn concentration on microstructure and corrosion resistance of Mg-Zn alloys microalloyed with Ca and Ce

Cheng Zhang (Yangtze Normal University, Chongqing, China and Southwest University, Chongqing, China)
Cheng Peng (Yangtze Normal University, Chongqing, China)
Jin Huang (Southwest University, Chongqing, China and Shihezi University, Shihezi, China)
Yanchun Zhao (Yangtze Normal University, Chongqing, China)
Guangsheng Huang (Chongqing University, Chongqing, China)
Liang Wu (Chongqing University, Chongqing, China)
Guangang Wang (Chongqing University, Chongqing, China)
Hua Zhang (Yantai University, Yantai, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 9 April 2021

Issue publication date: 25 May 2021

118

Abstract

Purpose

The influence of Zn concentration on microstructure and corrosion performance of the Mg–xZn alloys microalloyed with Ca and Ce was investigated through optic microscopy, scanning electron microscopy, hydrogen evolution, dynamic polarization and electrochemical impedance spectroscopy experiments.

Design/methodology/approach

In this paper, Mg–xZn alloys (x = 0.5∼2.0 Wt.%) microalloyed with Ca and Ce (0.2 Wt.% each) were prepared.

Findings

As the increase of Zn concentration, the number of second phase particles (Mg-Zn-Ca, Mg-Zn-Ce and Mg-Ce phases) increased, and when the Zn concentration increased to 2.0 Wt.%, the new second phase Mg-Zn phase was precipitated.

Originality/value

The influence of Zn concentration on corrosion mechanism of Mg-xZn alloys microalloyed with Ca and Ce was revealed. Increasing of the Zn concentration resulted in the intensification of galvanic corrosion. When Zn concentration was 0.5 Wt.%, the alloy showed the lowest corrosion rate (0.61 mm y-1), which was about 1/2 of that of Mg-2.0Zn-0.2Ca-0.2Ce alloy.

Keywords

Acknowledgements

This work was supported by the Project for Chongqing University Innovation Research Group of Chongqing Education Committee (CXQT19008), the Chongqing Talent Plan for Innovation and Entrepreneurship Demonstration Team (CQYC201903243), the S&T Project of Science and Technology Bureau of Bishan District in Chongqing (Bskj20200011), National Natural Science Foundation of China (U1810122), Key Research and Development Program of Shanxi Province (201903D421076) and Talent Training Program for Shandong Province Higher Educational Youth Innovative Teams (2019).

Citation

Zhang, C., Peng, C., Huang, J., Zhao, Y., Huang, G., Wu, L., Wang, G. and Zhang, H. (2021), "Effect of Zn concentration on microstructure and corrosion resistance of Mg-Zn alloys microalloyed with Ca and Ce", Anti-Corrosion Methods and Materials, Vol. 68 No. 2, pp. 130-136. https://doi.org/10.1108/ACMM-11-2020-2407

Publisher

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Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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