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Materials 2016, 9(4), 216;

The Enhancement of Mg Corrosion Resistance by Alloying Mn and Laser-Melting

State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
College of Chemistry, Xiangtan University, Xiangtan 411105, China
Department of Emergency Medicine, 2nd Xiangya Hospital of Central South University, Changsha 410083, China
State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Regine Willumeit-Römer
Received: 21 January 2016 / Revised: 5 March 2016 / Accepted: 17 March 2016 / Published: 23 March 2016
(This article belongs to the Special Issue Degradable Biomaterials Based on Magnesium Alloys)
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Mg has been considered a promising biomaterial for bone implants. However, the poor corrosion resistance has become its main undesirable property. In this study, both alloying Mn and laser-melting were applied to enhance the Mg corrosion resistance. The corrosion resistance, mechanical properties, and microstructure of rapid laser-melted Mg-xMn (x = 0–3 wt %) alloys were investigated. The alloys were composed of dendrite grains, and the grains size decreased with increasing Mn. Moreover, Mn could dissolve and induce the crystal lattice distortion of the Mg matrix during the solidification process. Mn ranging from 0–2 wt % dissolved completely due to rapid laser solidification. As Mn contents further increased up to 3 wt %, a small amount of Mn was left undissolved. The compressive strength of Mg-Mn alloys increased first (up to 2 wt %) and then decreased with increasing Mn, while the hardness increased continuously. The refinement of grains and the increase in corrosion potential both made contributions to the enhancement of Mg corrosion resistance. View Full-Text
Keywords: corrosion resistance; Mg-Mn alloy; laser-melting; microstructure; mechanical properties corrosion resistance; Mg-Mn alloy; laser-melting; microstructure; mechanical properties

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Yang, Y.; Wu, P.; Wang, Q.; Wu, H.; Liu, Y.; Deng, Y.; Zhou, Y.; Shuai, C. The Enhancement of Mg Corrosion Resistance by Alloying Mn and Laser-Melting. Materials 2016, 9, 216.

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