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Varied corrosion evolution behavior of pure Mg, AZ31 and AZ91 magnesium alloys in phosphate buffer solution

Mengmeng Li (CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China and School of Material Science and Engineering, University of Science and Technology of China, Hefei, China)
Jian Chen (CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China)
Jingtao Sun (Department of Joint Disease, The Orthopedics Hospital of Zhengzhou City, Zhengzhou, China)
Long Hao (CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China and School of Material Science and Engineering, University of Science and Technology of China, Hefei, China)
Di Wu (CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China and School of Material Science and Engineering, University of Science and Technology of China, Hefei, China)
Jianqiu Wang (CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China and School of Material Science and Engineering, University of Science and Technology of China, Hefei, China)
Wei Ke (CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences, Shenyang, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 8 May 2023

Issue publication date: 13 June 2023

117

Abstract

Purpose

The purpose of this study is to investigate the initial corrosion behavior of pure Mg, AZ31 and AZ91 alloys in phosphate buffer solution (PBS) and to characterize the features in corrosion type and resistance of the corrosion product layer.

Design/methodology/approach

The scanning electron microscopy, equipped with energy-dispersive spectroscopy, X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy have been used to characterize the as-corroded samples. Besides, the Mg2+ concentration in PBSs has been determined by inductively coupled plasma atomic emission spectrum.

Findings

It has been found that pure Mg suffers pit corrosion, and AZ31 initially undergoes pit corrosion and then uniform corrosion dominates with an extended immersion duration. However, AZ91 exhibits the uniform corrosion with the highest corrosion rate among the three materials. Besides, the corrosion product layer on AZ31 has the best compactness and corrosion resistance.

Originality/value

The findings add depth in understanding the corrosion of pure Mg and its alloys in PBS and also have guiding significance in exploring the effects by alloyed elements to develop new biomaterials with better performance.

Keywords

Acknowledgements

Declaration of competing interest. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Citation

Li, M., Chen, J., Sun, J., Hao, L., Wu, D., Wang, J. and Ke, W. (2023), "Varied corrosion evolution behavior of pure Mg, AZ31 and AZ91 magnesium alloys in phosphate buffer solution", Anti-Corrosion Methods and Materials, Vol. 70 No. 4, pp. 166-172. https://doi.org/10.1108/ACMM-03-2023-2773

Publisher

:

Emerald Publishing Limited

Copyright © 2023, Emerald Publishing Limited

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