Mg-2Zn-0.5Ca-Y系列镁合金在模拟体液和氯化钠溶液中的腐蚀行为和电化学性质（英文）

发布时间：2019-03-03 16:39

【摘要】：利用金相显微镜和扫描电镜观察Mg-2Zn-0.5Ca-Y系列镁合金的金相结构及表面微观形貌,使用电化学测试系统测试铸态Mg-2Zn-0.5Ca-Y系列镁合金在模拟体液和3.5%Na Cl溶液中的电化学腐蚀性能,通过在模拟体液和3.5%Na Cl溶液中的浸泡试验测试其腐蚀速率。Mg-2Zn-0.5Ca-Y系列镁合金的微观腐蚀形貌表明,腐蚀并不均匀,在浸泡试验后其腐蚀表面有大量的裂纹。稀土Y的加入能够提高其耐蚀能力,并且Mg-2Zn-0.5Ca-1.0Y合金的耐蚀性优于其他同系合金。由于腐蚀保护层的存在,所有在模拟体液和氯化钠溶液中得到的极化曲线均显示出高容电流。在实验条件下的电化学阻抗曲线均仅有一个循环电容。出现高频率的循环电容是由于稳定的双电层电容的存在。出现低频率的循环电容是由于自由区域的扩散控制膜。
[Abstract]:The metallographic structure and surface morphology of Mg-2Zn-0.5Ca-Y series magnesium alloys were observed by metallographic microscope and scanning electron microscope. Electrochemical corrosion behavior of as-cast Mg-2Zn-0.5Ca-Y magnesium alloy in simulated body fluid and 3.5%Na Cl solution was tested by electrochemical test system. The corrosion rate was tested by immersion test in simulated body fluid and 3.5%Na Cl solution. The micro-corrosion morphology of Mg-2Zn-0.5Ca-Y series magnesium alloys showed that the corrosion was not uniform. After immersion test, there are a lot of cracks on the corroded surface. The addition of rare earth Y can improve its corrosion resistance, and the corrosion resistance of Mg-2Zn-0.5Ca-1.0Y alloy is better than that of other homogenous alloys. Due to the existence of corrosion protective layer, all polarization curves obtained in simulated body fluid and sodium chloride solution show high volume current. There is only one cyclic capacitance in the electrochemical impedance curves under the experimental conditions. The high frequency cyclic capacitance is due to the existence of stable double layer capacitance. The low frequency cyclic capacitance is due to the diffusion control film in the free region.
【作者单位】：长春工业大学先进结构材料教育部重点实验室;
【基金】：National Natural Science Foundation of China(51171030) Science and Technology Department of Jilin Province Key Project(20120345)
【分类号】：TG146.22

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