Effect of Alloying Mn by Selective Laser Melting on the Microstructure and Biodegradation Properties of Pure Mg

Bin Xie; Ming-Chun Zhao; Ying-Chao Zhao; Yan Tian; Dengfeng Yin; Chengde Gao; Cijun Shuai; Andrej Atrens

doi:10.3390/met10111527

Metals (Nov 2020)

Effect of Alloying Mn by Selective Laser Melting on the Microstructure and Biodegradation Properties of Pure Mg

Bin Xie,
Ming-Chun Zhao,
Ying-Chao Zhao,
Yan Tian,
Dengfeng Yin,
Chengde Gao,
Cijun Shuai,
Andrej Atrens

Affiliations

Bin Xie: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Ming-Chun Zhao: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Ying-Chao Zhao: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Yan Tian: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Dengfeng Yin: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Chengde Gao: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Cijun Shuai: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Andrej Atrens: Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, University of Queensland, Brisbane, QLD 4072, Australia

DOI: https://doi.org/10.3390/met10111527
Journal volume & issue: Vol. 10, no. 11
p. 1527

Abstract

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This work studied the effect of alloying Mn by selective laser melting on the microstructure and biodegradation properties of pure Mg. The grains in the microstructure were quasi-polygon in shape. The average grain size was similar (~10 μm) for the SLMed Mg-xMn with different Mn contents. The XPS spectra of the corrosion surface showed that alloying Mn into Mg by SLM produced a relatively protective manganese oxide film, which contributed to decreasing the biodegradation rate. All the results of the electrochemistry test, immersion test and the corrosion surface morphologies coincided well. The SLMed Mg-0.8Mn had the lowest biodegradation rate. When Mn content was more than 0.8 wt.%, the influence of the undissolved Mn phase on the decrease of the biodegradation resistance counteracted the influence of the relatively protective manganese oxide layer on the increase of the biodegradation resistance.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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