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Effects of scandium addition on the in vitro degradation behavior of biodegradable Mg–1.5Zn–0.6Zr alloy

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Abstract

Heretofore, recognitions of the systematic effects of scandium addition on corrosion behavior of biodegradable magnesium alloys are not yet clear. In the present study, a series of Mg–1.5Zn–0.6Zr–xSc (ZK21–xSc, x = 0, 0.2, 0.5, 1.0 wt.%) alloys were casted and investigated with respect to the immersion and electrochemical degradation behavior. The hydrogen evolution, pH monitoring, ion release and mass loss results demonstrated that ZK21–0.2Sc alloy exhibited the lowest corrosion rate. The surface morphology analyses displayed that an obvious uniform corrosion occurred in ZK21–xSc alloys with Sc content below 0.5, while localized corrosion occurred in ZK21–1.0Sc alloy. Corrosion potentials of ZK21–xSc alloys shifted toward more positive with the increasing Sc content. But ZK21–0.2Sc alloy exhibited the lowest corrosion current density and the largest corrosion film resistance. Compared with other developed Mg alloys, the ZK21–0.2Sc alloy demonstrated a superior degradation behavior.

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Acknowledgements

This project was financially supported by National Natural Science Foundation of China (No. 51174025), National Key Research and Development Program of China (Nos. 2016YFB0301105 and 2017YFB0103904), Shandong Provincial Natural Science Foundation (No. ZR2017LEM002), Specialized Fund for Shandong Postdoctoral Innovation Project (No. 201703093) and Youth Science Funds of Shandong Academy of Sciences (No. 2018QN0034). The authors thank Hailong Zhang at University of Science and Technology Beijing and Xiwei Liu at Lepu Medical Technology (Beijing) Co., Ltd. for meaningful discussion.

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, China

    Tao Li, Jianhua Wu, Jixue Zhou, Shouqiu Tang & Yuansheng Yang

  2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Tao Li & Yuansheng Yang

  3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Tao Li & Yong He

  4. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Xitao Wang

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  1. Tao Li
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Correspondence to Tao Li or Xitao Wang.

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Li, T., He, Y., Wu, J. et al. Effects of scandium addition on the in vitro degradation behavior of biodegradable Mg–1.5Zn–0.6Zr alloy. J Mater Sci 53, 14075–14086 (2018). https://doi.org/10.1007/s10853-018-2626-4

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