The effect of heat treatment on the mechanical and biocorrosion behaviour of the Mg-1 wt.% Zn-1 wt.% Ca (ZX11) and Mg-3 wt.% Zn-0.4 wt.% Ca (ZX30) alloys was evaluated. For this purpose, three-point bending tests as well as electrochemical and immersion tests in Hank's solution were performed on both alloys in four different thermal conditions: as-cast, solution-treated, peak-aged and over-aged. Microstructural examinations revealed that the as-cast ZX11 and ZX30 alloys exhibit a microstructure composed of α-Mg grains separated by large Mg₂Ca and Ca₂Mg₆Zn₃ particles and by large Ca₂Mg₆Zn₃ particles, respectively. During solution treatment, the Ca₂Mg₆Zn₃ precipitates at the grain boundaries (GBs) are fully dissolved in the ZX11 alloy, but mainly redistributed to form a more connected configuration in the ZX30 alloy, showing a poor age-hardening response. Consequently, after solution-treatment, galvanic corrosion and corrosion rate decreases in the former, but increases in the latter. The peak-aged condition displays the highest corrosion rate for both alloys, maybe due to an excessive number density of fine Ca₂Mg₆Zn₃ particles acting as cathodic sites. However, the over-aged condition shows the lowest corrosion rate for the ZX11 alloy and a very similar one to that of the as-cast sample for the ZX30 alloy. The ZX11 alloy shows generally better biocorrosion behaviour than the ZX30 alloy to its lower content in the Ca₂Mg₆Zn₃ phase and thus reduced galvanic corrosion. The Mg₂Ca phase present in the studied ZX11 alloy has been proved to exhibit an increased corrosion potential, which has been related to an observed enrichment with Zn.

评估了热处理对 Mg-1 wt.% Zn-1 wt.% Ca (ZX11) 和 Mg-3 wt.% Zn-0.4 wt.% Ca (ZX30) 合金的机械和生物腐蚀行为的影响。为此，在四种不同的热条件下对两种合金进行了三点弯曲试验以及汉克溶液中的电化学和浸渍试验：铸态、固溶处理、峰值时效和过时效。显微组织检查表明，铸态 ZX11 和 ZX30 合金的显微组织由α-Mg 晶粒组成，这些晶粒分别由大的 Mg ₂ Ca 和 Ca ₂ Mg ₆ Zn ₃颗粒和大的 Ca ₂ Mg ₆ Zn ₃颗粒隔开。在固溶处理过程中，Ca晶界（GBs）处的₂ Mg ₆ Zn ₃析出物完全溶解在 ZX11 合金中，但主要重新分布以在 ZX30 合金中形成更连接的配置，显示出较差的时效硬化反应。因此，在固溶处理后，前者的电偶腐蚀和腐蚀速率降低，而后者增加。两种合金的峰值时效条件显示出最高的腐蚀速率，这可能是由于细粒 Ca ₂ Mg ₆ Zn _{3 的}数量密度过高颗粒充当阴极位点。然而，过时效条件显示 ZX11 合金的腐蚀速率最低，与 ZX30 合金的铸态样品非常相似。ZX11 合金通常表现出比 ZX30 合金更好的生物腐蚀行为，因为它在 Ca ₂ Mg ₆ Zn ₃相中的含量较低，因此减少了电偶腐蚀。已证明所研究的 ZX11 合金中存在的 Mg ₂ Ca 相表现出增加的腐蚀电位，这与观察到的 Zn 富集有关。