In this paper, the corrosion behavior of Mg–Ca–Zn alloys with high Zn content is investigated by electrochemical test and immersion test. The results show that the type, volume fraction and distribution of the second phases in Mg–Ca–Zn alloys change with the increase of Zn addition. The corrosion resistance of Mg–Ca–Zn alloys increases initially, followed by a decrease, but then again increases with the addition of Zn content. The corrosion resistance of XZ12 alloy is the best among the four alloys and the corrosion rates by weight loss of it is about 2.47 mm/y. For XZ10 alloy, Mg₂Ca phase is preferred to be corroded to form a corrosion channel to accelerate the corrosion. While in XZ12 alloy, higher corrosion resistance of Mg₂Ca enriched with Zn becomes the key to reduce the corrosion and thus induces uniform corrosion. The intermittent ternary phase in XZ15 alloy acts as the cathode for accelerating corrosion, while the continuous reticular ternary phase in XZ18 alloy serves as a barrier for further corrosion.

本文通过电化学试验和浸没试验研究了高锌含量的Mg-Ca-Zn合金的腐蚀行为。结果表明，Mg-Ca-Zn合金中第二相的类型，体积分数和分布随Zn添加量的增加而变化。Mg-Ca-Zn合金的耐蚀性最初增加，然后降低，但随后随着锌含量的增加再次增加。XZ12合金的耐蚀性是四种合金中最好的，按重量损失的腐蚀速率约为2.47 mm / y。对于XZ10合金，优选腐蚀Mg ₂ Ca相以形成腐蚀通道以加速腐蚀。而在XZ12合金中，Mg _2的耐腐蚀性更高富含Zn的Ca成为减少腐蚀并因此引起均匀腐蚀的关键。XZ15合金中的间歇三元相充当加速腐蚀的阴极，而XZ18合金中的连续网状三元相充当进一步腐蚀的屏障。