Microstructure, hardness and biocorrosion properties of ZXM220–xSr alloys (x = 0, 0.2, 0.4, 0.8 and 1 wt%) were investigated, and the results were compared with each other. Microstructural characterizations were carried out by XRD, optical and scanning electron microscopes. Biocorrosion properties were determined by immersion and electrochemical corrosion tests, performed in a simulated body fluid solution at 37 °C. Compared to the Sr-free alloy, Sr-bearing alloys exhibited a smaller grain size and a higher volume fraction of second-phase particles. The hardness of the alloy was also gradually improved by increasing Sr additions. Biocorrosion properties of the alloy significantly improved by 0.2 wt% Sr addition, and these properties deteriorated with higher additions of Sr due to the strong microgalvanic effect of coarse second-phase particles. Therefore, the ZXM220–0.2Sr alloy can be regarded as a promising candidate for a new biodegradable implant material due to the optimum results of mechanical and biocorrosion properties.

中文翻译：

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Sr在潜在植入物中使用的Mg–2Z​​n–2Ca–0.5Mn（ZXM220）铸造合金的组织，硬度和可生物降解行为中的作用

ZXM220– x Sr合金的组织，硬度和生物腐蚀性能（x = 0、0.2、0.4、0.8和1 wt％），并将结果相互比较。通过XRD，光学和扫描电子显微镜进行微观结构表征。生物浸蚀性能是通过在37°C的模拟体液溶液中进行的浸没和电化学腐蚀测试确定的。与不含Sr的合金相比，含Sr的合金具有较小的晶粒尺寸和较高的第二相颗粒体积分数。通过增加Sr的添加，合金的硬度也逐渐提高。通过添加0.2 wt％的Sr，合金的生物腐蚀性能得到了显着改善，并且由于第二相粗粒的强大的微电流作用，随着Sr的添加，这些性能会下降。因此，ZXM220-0。