两栖车辆Al-Zn-In-Mg-Ti牺牲阳极的保护性能

Protective Performance of Al-Zn-In-Mg-Ti Sacrificial Anode for Amphibian Vehicles

两栖车辆工作在高温、干湿交替的环境中,腐蚀十分严重,常用牺牲阳极和防腐蚀涂层技术进行阴极保护。采用交流阻抗技术、失重法和扫描电镜(SEM)研究了自腐蚀、自放电条件下,两栖车辆Al-Zn-In-Mg-Ti牺牲阳极的溶解性能和对阴极材料的保护性能。结果表明:自放电下Al-Zn-In-Mg-Ti牺牲阳极一定程度上降低了阴极材料的腐蚀速率,但保护效果不理想,牺牲阳极的活化性能一般,腐蚀产物不易脱落,但有基体晶粒脱落;自腐蚀下Al-Zn-In-Mg-Ti牺牲阳极受表面腐蚀产物和氧化膜影响,活性点随着自腐蚀的进行不断减少。

The dissolution behavior of Al-Zn-In-Mg-Ti sacrifical anode used on amphibian vehicles and its protection performance for cathode were investigated under natural corrosion and self-discharge conditions using electrochemical impedance spectroscopy,weight-loss measurement and scanning electron microscopy.Results show that Al-Zn-In-Mg-Ti sacrificial anode with self-discharge capacity is able to reduce the corrosion rate of cathode material to some extent,but its protective effectiveness is inefficient.The sacrificial anode had fair activity,and its corroded product was not easy to be peeled off,while some grains of the substrate were detached.Besides,naturally corroded sacrificial anode surface was influenced by the corroded product and oxide film,and the number of active spots was reduced with the progress of corrosion.