Zn-based alloys have found increasing interest as orthopedic biodegradable implantable materials, hence it was the aim of this work to investigate the microstructure and corrosion behavior of Zn–0.5Al–xMg cast alloys with different Mg additions in simulated body fluid (SBF). The cast samples were prepared using a simple stir casting method and the molten alloys were poured in a cast iron mold. The SEM results showed that adding Mg greatly influenced the microstructure of the Zn-based alloys where the degree of fineness of the microstructure increased with a rise in the Mg content. Moreover, polarization measurements revealed that the Zn–0.5Al–0.6Mg alloy attained the lowest degradation rate of 0.33 mm/year as compared to the other investigated alloys which complies the requirements of ideal corrosion rates for biodegradable bone implants. This corrosion rate helps the implantable metal alloy to last in the body until healing of the bone tissue proceeds. The fine structure and uniform distribution of Aluminum oxide and MgZn₂ intermetallic phases along the grain boundaries were most likely the main factors in the superior corrosion stability of the Zn–0.5Al–0.6Mg alloy in SBF. However, higher concentrations of Mg (1 wt%) lowered the corrosion resistance of the Zn–Al–Mg alloy which was attributed to the accelerated galvanic corrosion between Zn and Mg₂ Zn₁₁ phases and the inhomogeneous distribution of corrosion products on the alloy surface due to the increased grain size and the coarse structure of the Zn alloy.

锌基合金作为骨科生物可降解植入材料越来越受到关注，因此本研究的目的是研究 Zn-0.5Al- x的微观结构和腐蚀行为在模拟体液 (SBF) 中添加不同 Mg 的镁铸造合金。使用简单的搅拌铸造方法制备铸造样品，并将熔融合金倒入铸铁模具中。SEM 结果表明，添加 Mg 对 Zn 基合金的微观结构有很大影响，微观结构的细化程度随着 Mg 含量的增加而增加。此外，极化测量表明，与其他研究的合金相比，Zn-0.5Al-0.6Mg 合金的降解速率最低，为 0.33 毫米/年，符合可生物降解骨植入物的理想腐蚀速率要求。这种腐蚀速率有助于植入式金属合金在体内持续存在，直到骨组织开始愈合。氧化铝和MgZn的精细结构和均匀分布_{沿晶界的2 个}金属间相很可能是 Zn-0.5Al-0.6Mg 合金在 SBF 中具有优异腐蚀稳定性的主要因素。然而，较高浓度的 Mg (1 wt%) 降低了 Zn-Al-Mg 合金的耐腐蚀性，这归因于 Zn 和 Mg ₂ Zn ₁₁相之间的加速电化腐蚀以及腐蚀产物在合金表面的不均匀分布由于锌合金的晶粒尺寸增加和粗结构。