采用传统钢模铸造法和高冷却速率的水冷铜模喷铸法两种方法制备Mg?1Zn?0.5Ca合金，对合金的组织、力学性能和生物腐蚀性能进行对比研究。研究结果表明，提高冷却速度，合金的组织更均匀，晶粒尺寸显著细化。在3.5% NaCl溶液和模拟体液Hank’s溶液中采用动电位极化和浸泡失重测试合金的耐生物腐蚀性，结果显示高冷却速率下制备的合金在两种溶液中均具有较好的耐生物腐蚀性，其原因为提高冷却速率使合金组织更均匀，原电池腐蚀效应减弱。提高冷却速度，合金的屈服强度、抗拉强度和伸长率等力学性能得到提高。晶粒细化是其力学性能提高的主要原因。
Mg?1Zn?0.5Ca alloys were prepared by traditional steel mould casting and water-cooled copper mould injection casting at higher cooling rate. Microstructure, mechanical properties and bio-corrosion resistance of two alloys were contrastively investigated. Grain size reduces remarkably and microstructure becomes homogenous when raising cooling rate. The bio-corrosion behaviour in 3.5% sodium chloride solution (3.5% NaCl) and Hank’s solution at 37°C was investigated using electrochemical polarization measurement and the results indicate that the alloy prepared at higher cooling rates has better corrosion resistance in both types of solution. Further mass loss immersion test in Hank’s solution reveals the same result. The reason of corrosion resistance improvement is that raising cooling rate brings about homogeneous microstructure, which leads to micro-galvanic corrosion alleviation. The tensile test results show that yield strength, ultimate tensile strength and elongation are improved by raising cooling rate and the improvement is mainly due to grain refinement.
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