Bioceramic calcium phosphorus (CaP) coatings were prepared on self-designed Mg–xZn–0.6Ca (x = 3.0, 4.5, 6.0 wt. %) alloy by microarc oxidation (MAO). The corrosion resistance, bioactivity, and biodegradability of the CaP coatings prepared on alloys with different zinc (Zn) contents were systematically studied and discussed by potentiodynamic polarization and in vitro immersion tests in the simulated body fluid solution. The CaP coatings and corrosion products were characterized by scanning electron microscopy, energy dispersive spectrometry, x-ray diffraction, and Fourier transform infrared spectroscopy. Based on the difference of microstructure caused by zinc content, the effect of microstructure on the properties of MAO coatings was analyzed by taking grain boundary and second phase defects as examples. Results showed that the CaP coatings could be prepared on the surface of the self-designed Mg–Zn–0.6Ca alloy by MAO. The CaP coatings have good bioactivity. Meanwhile, the Zn content has a significant effect on the microstructure of the CaP coatings. When the Zn content is 3.0 wt. %, the corrosion resistance and biocompatibility of the CaP coatings are obviously improved with good biological properties.

中文翻译：

---

锌含量对微弧氧化 Mg-xZn-0.6Ca (x= 3.0, 4.5, 6.0) 合金的显微组织、体外生物活性和腐蚀行为的影响

在自行设计的 Mg- x Zn-0.6Ca ( x  = 3.0, 4.5, 6.0 wt. %) 合金上通过微弧氧化 (MAO)制备了生物陶瓷钙磷 (CaP) 涂层。通过动电位极化和体外实验系统研究和讨论了在不同锌（Zn）含量合金上制备的CaP涂层的耐腐蚀性、生物活性和生物降解性。在模拟体液溶液中进行浸泡试验。通过扫描电子显微镜、能量色散光谱、X 射线衍射和傅里叶变换红外光谱对 CaP 涂层和腐蚀产物进行了表征。基于锌含量引起的显微组织差异，以晶界和第二相缺陷为例，分析了显微组织对MAO涂层性能的影响。结果表明，通过MAO可以在自行设计的Mg-Zn-0.6Ca合金表面制备CaP涂层。CaP涂层具有良好的生物活性。同时，Zn含量对CaP涂层的微观结构有显着影响。当 Zn 含量为 3.0 wt. %，CaP涂层的耐腐蚀性和生物相容性明显提高，具有良好的生物性能。