Zn含量对Al-Zn-In-Mg牺牲阳极电化学性能的影响  

Effect of Zn Content on Electrochemical Properties of Al-Zn-In-Mg Sacrificial Anode Alloy

作　　者：罗维华 王海涛 于林 许实 刘朝信 郭宇 王廷勇 LUO Weihua;WANG Haitao;YU Lin;XU Shi;LIU Zhaoxin;GUO Yu;WANG Tingyong(SunRui Marine Environment Engineering Company Ltd.,Qingdao 266101,China)

机构地区：[1]青岛双瑞海洋环境工程股份有限公司,青岛266101

出　　处：《中国腐蚀与防护学报》2023年第5期1071-1078,共8页Journal of Chinese Society For Corrosion and Protection

摘　　要：设计并制备了不同Zn含量的Al-Zn-0.03In-1.30Mg牺牲阳极材料,采用恒电流、动电位极化和电化学阻抗谱方法研究了Zn含量对Al-Zn-0.03In-1.30Mg阳极电化学性能的影响,采用金相显微镜、扫描电子显微镜(SEM)和能谱(EDS)分析Zn含量对阳极的显微组织与腐蚀形貌的影响。结果表明:随着Zn含量的升高,Al-Zn-0.03In-1.30Mg阳极晶粒更细化且金相组织更均匀,自腐蚀电位显著负移;添加0.60%~10.00%(质量分数)的Zn可以有效破坏阳极表面的钝化膜从而改善阳极的溶解形貌,但Zn含量大于5.00%时,阳极会产生枝晶,增加局部腐蚀倾向使阳极溶解不均匀、电化学性能降低,0.60%~2.00%Zn含量阳极均具有较高的电化学性能,阳极的表面溶解均匀,电容量在2570 A·h·kg^(-1)以上,工作电位≤-1.05 V(vs SCE);其中0.60%Zn含量阳极能够显著降低牺牲阳极材料中Zn对海洋环境的重金属污染,可作为环保型牺牲阳极材料使用。Al-Zn-0.03In-1.30Mg sacrificial anode alloys with various Zn contents were designed and prepared.The effect of Zn content on the electrochemical properties of the Al-Zn-0.03In-1.30Mg anode alloys were investigated by AC impedance spectroscopy,galvanostatic-and potentiodynamic-polarization measurements.While the effect of Zn content on the microstructure and corrosion morphology of the alloys were analyzed by metallographic microscope,scanning electron microscope(SEM)and energy dispersive analysis(EDS).The results showed that with the increasing Zn content the grain size of Al-Zn-0.03In-1.30Mg alloys became finer with more uniform microstructure,whilst the free-corrosion current density shifted significantly in the negative direction.The addition of 0.60%-10.00%(mass fraction)Zn could effectively destroy the passive film on the alloy surface and improve the dissolution morphology of the anode alloy.But when the content of Zn excesses 5.00%,dendrites were generated,which would increase local corrosion tendency to make the alloy dissolve ununiformly with decreasing electrochemical properties.The anode alloys with 0.60%~2.00%Zn all exhibited high electrochemical performance,of which the surface dissolved uniformly with a capacity over 2570 A·h·kg^(-1),and the working potential lower than-1.05 V(vs SCE).The anode alloy with 0.60%Zn could significantly reduce the heavy metal Zn pollution to the marine environment.Therefore,it could be used as environment-friendly sacrificial anode material.

关 键 词：铝合金牺牲阳极 腐蚀 电流效率 EIS 显微组织 

分 类 号：TG174.41[金属学及工艺—金属表面处理]