铸态Mg-Zn-Y-Zr合金的耐蚀性研究  

The study on corrosion resistance of as-cast Mg-Zn-Y-Zr alloy

作　　者：徐盛孝 何美凤[1] XU Shengxiao;HE Meifeng(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《有色金属材料与工程》2024年第4期77-83,共7页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(51771120,51304136)。

摘　　要：通过失重法、析氢法、电化学、扫描电子显微镜(scanning electron microscope,SEM)和能谱仪(energy dispersive spectrometer,EDS)等试验方法,研究了Zn元素对铸态Mg-xZn-0.5Y-0.5Zr(x=0.83%、1.56%和2.80%,质量分数)合金在模拟体液中耐蚀性的影响。研究结果表明:随着Zn含量的增加,3种合金中的W相(Mg3Zn3Y2)含量也增加;Zn元素含量为1.56%和2.80%的合金,沿晶界开始出现了I相(Mg2Zn6Y)。电化学结果表明Zn的添加使得合金的腐蚀电流密度从1.100 mA/cm^(2)降低到0.423 mA/cm^(2)。合金内部的电荷转移电阻从59.95Ω提高到165.35Ω,腐蚀速率降低到9.11 mm/a,此时抗腐蚀产物膜破裂的性能最好。此外,通过研究发现合金的腐蚀产物为MgO、少量ZnO和磷灰石。The effect of Zn element on the corrosion resistance of as-cast Mg-xZn-0.5Y-0.5Zr(x=0.83%,1.56%,2.80%,mass fraction)by weight loss method,hydrogen precipitation method,electrochemistry,scanning electron microscope(SEM)and energy dispersive spectrometer(EDS)was investigated in simulated body fluids.The results showed that the content of W-phase(Mg3Zn3Y2)in the three alloys increases with the increase of Zn content;and I-phase(Mg2Zn6Y)appears along the grain boundaries in the alloys with Zn content of 1.56%and 2.80%.The electrochemical results show that the addition of Zn reduces the corrosion current density of the alloy from 1.100 mA/cm^(2) to 0.423 mA/cm^(2).The charge transfer resistance within the alloy increases from 59.95Ωto 165.35Ω,and the corrosion rate decreases to 9.11 mm/a,when the resistance to rupture of the corrosion product film is best.In addition,the corrosion products of the alloy were found to be MgO,a small amount of ZnO and apatite.

关 键 词：MG-ZN-Y-ZR合金 W相 析氢法 失重法 电化学 

分 类 号：TG[金属学及工艺]