Sb对Mg-4Zn-Y合金耐腐蚀性能的影响

Effects of Sb Addition on Corrosion Resistance of Mg-4Zn-Y Alloys

研究了Mg-4Zn-Y-xSb(x=0,0.5,1,2)合金在3.5%NaCl溶液中的腐蚀行为,利用金相显微镜、电化学极化曲线和电化学阻抗测试研究了Sb对Mg-4Zn-Y合金耐蚀性能的影响。结果表明,在试验范围内Mg-4Zn-Y-xSb(x=0,0.5,1,2)合金的耐蚀性能随着Sb含量的增加而降低。Mg-4Zn-Y-2Sb合金的腐蚀速率比Mg-4Zn-Y合金上升了一个数量级,合金的腐蚀电流达到2.254E-4 A。

Corrosion behaviors of Mg-4Zn-Y-xSb（x=0,0.5,1,2）alloys in the 3.5% NaCl solution were investigated,and effects of Sb addition on corrosion resistance of Mg-4Zn-Y alloys were also studied by optical morphology,electrochemical polarization curves and electrochemical impendence spectrum（EIS）.The results show that the addition of Sb decreases the corrosion resistance of the Mg-4Zn-Y-xSb（x=0,0.5,1,2）alloys at experimental conditions.The corrosion rate of the Mg-4Zn-Y-2Sb alloy increased by one order of magnitude as compared with that of Mg-4Zn-Y alloy,and the corrosion current reached 2.254E-4 A.