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Microstructure and corrosion resistance of bone-implanted Mg–Zn–Ca–Sr alloy under different cooling methods

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Abstract

The cooling gradient of Mg–3Zn–1Ca–0.5Sr alloy in cast ingots under different cooling methods (air cooling, warm-water cooling and ice–water-mixture cooling) was examined and the effect of cooling rate on the structure and corrosion properties was studied. The microstructure of the alloy was composed of α-Mg, Ca2Mg6Zn3 and Mg17Sr2 phases. As the solidification cooling rate increased, the grain was refined, Zn and Sr were less segregated, the distributions of Zn and Sr were more uniform, and corrosion rate was found to first increase and then decrease; this contradicts the findings of recent research. With cooling rate increasing, the number of corroded microcouples comprising second phase and α-Mg increases. More α-Mg participates in corrosion, leading to a layered and deep corrosion pit and an increased corrosion rate. However, as the microstructure became sufficiently dense, the corroded structure protected the deep α-Mg from participating in corrosion, thus reducing the corrosion rate.

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Acknowledgements

The authors thank Jiangsu Province Achievement Transformation Project (BA2017044). The authors acknowledge the staff at GRIMAT Engineering institute Co., Ltd. for their time and instrument use. Thanks to GRINM Analysis and Testing Center at for permitting us to use their electron microscope and to my teachers and classmates for their help.

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Authors and Affiliations

  1. State Key Laboratory of Nonferrous Metals and Process, GRINM Group Co., Ltd., Beijing, 100088, China

    He-Ning Liu, Kui Zhang, Xing-Gang Li, Yong-Jun Li, Ming-Long Ma, Guo-Liang Shi & Jia-Wei Yuan

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    He-Ning Liu & Kai-Kun Wang

  3. GRIMAT Engineering Institute Co., Ltd., Beijing, 101407, China

    He-Ning Liu, Kui Zhang, Xing-Gang Li, Yong-Jun Li, Ming-Long Ma, Guo-Liang Shi & Jia-Wei Yuan

  4. General Research Institute for Nonferrous Metals, Beijing, 100088, China

    He-Ning Liu, Kui Zhang, Xing-Gang Li, Yong-Jun Li, Ming-Long Ma, Guo-Liang Shi & Jia-Wei Yuan

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  1. He-Ning Liu
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Correspondence to Kui Zhang.

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Liu, HN., Zhang, K., Li, XG. et al. Microstructure and corrosion resistance of bone-implanted Mg–Zn–Ca–Sr alloy under different cooling methods. Rare Met. 40, 643–650 (2021). https://doi.org/10.1007/s12598-020-01368-7

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  • DOI: https://doi.org/10.1007/s12598-020-01368-7

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