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Journal of Materials Engineering and Performance

, Volume 28, Issue 3, pp 1553–1562 | Cite as

Effects of the Addition of Micro-amounts of Calcium on the Corrosion Resistance of Mg-0.1Mn-1.0Zn-xCa Biomaterials

  • Jin Wang
  • Jing-Yuan LiEmail author
  • Yuan Zhang
  • Wei-Ming Yu
Article
  • 111 Downloads

Abstract

Magnesium alloys have good biocompatibility and degradability, which are considered ideal characteristics of biomedical implants. However, there are few studies on the influence of the addition of micro-amounts of Ca on magnesium alloys. In this work, the effects of adding micro-amounts of Ca on the microstructure, mechanical properties, and corrosion properties of Mg-0.1Mn-1.0Zn-xCa (x = 0.1, 0.2, and 0.3 wt.%) alloys were investigated. The results reveal that the grain size of the alloy decreased and the yield strength and elongation both increased with increasing Ca concentrations. Corrosion tests in Kokubo simulated body fluid showed that the in vitro immersion rate first slowed down and then increased (6.395 → 6.283 → 6.395 mm/year) with increasing Ca concentrations. This phenomenon was due to the addition of Ca causing grain refinement, which slowed the corrosion rate and generated an Mg2Ca phase to accelerate corrosion. The second-phase Mg2Ca precipitated at the grain boundary and acted as a cathode, and the metal magnesium phase acted as an anode to form a primary battery, which caused corrosion of the magnesium phase and accelerated the corrosion rate.

Keywords

Ca corrosion resistance magnesium alloy mechanical properties microstructure 

Notes

Acknowledgment

The authors appreciate the financial support of the National Key Research and Development Program of China (2016YFB0700300).

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Jin Wang
    • 1
  • Jing-Yuan Li
    • 1
    Email author
  • Yuan Zhang
    • 1
  • Wei-Ming Yu
    • 1
  1. 1.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina

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