Al-Zn-In-Mg阳极低温海水环境电化学性能研究  

Electrochemical Performance of Al-Zn-In-Mg Sacrificial Anode in Cold Seawater

作　　者：王海涛 许实 王辉 王洪仁 WANG Haitao;XU Shi;WANG Hui;WANG Hongren(Sunrui Marine Environment Engineering Co.,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：《腐蚀科学与防护技术》2018年第4期413-418,共6页Corrosion Science and Protection Technology

摘　　要：通过恒电流极化、动电位扫描、电化学阻抗、金相组织观察、扫描电镜和能谱分析等方法和腐蚀失重实验,研究了Al-Zn-In-Mg牺牲阳极在低温和常温环境的电化学性能和腐蚀过程,结果表明:Al-Zn-In-Mg阳极在低温和常温环境下都具有良好活化性能,在3和20℃天然海水中电容量分别达到2678和2571 A·h·kg-1,阳极表面溶解均匀,低温环境阳极开路电位和工作电位负移,其电化学性能达到阴极保护材料性能要求。通过极化曲线、电化学阻抗和腐蚀失重实验证明Al-Zn-In-Mg阳极在低温环境下阳极自腐蚀速率降低,自身消耗降低,从而导致了阳极低温海水中电化学性能优于常温环境。The corrosion behavior and working performance of Al-Zn-In-Mg sacrificial anode were studied in natural seawater at 3 and 20 ℃ respectively by means of gravimetric test, measurements of constant current polarization and potentiodynamic polarization, as well as electrochemical impedance spectroscopy, metallographic microscope, SEM with EDX. Results indicated that Al-Zn-In-Mg anode had good activation behavior in cold and normal temperature seawater. The Al-Zn-In-Mg anode presented uniform surface dissolution with electric capacities of 2678 and 2571 A·h·kg-1 in natural seawater at 3 and20 ℃ respectively. The open-circuit potential and closed-circuit potential of the anode in cold seawater were more negative relative to that in normal temperature one. The electrochemical performance of Al-ZnIn-Mg anode in cold seawater was better than that in normal temperature seawater, which was due essentially to the decreased self-corrosion rate of the anode in cold seawater.

关 键 词：铝牺牲阳极 低温 电化学性能 扫描电镜 

分 类 号：TG174.3[金属学及工艺—金属表面处理]