含Ga铝基牺牲阳极在干湿交替环境下的行为研究  

Behavior of Al Basic Sacrificial Anodes Containing Ga Element Under Wet and Dry Condition

作　　者：宋高伟[1] 黄燕滨[1] 丁华东[1] 巴国召[1] 闫永贵[2] 

机构地区：[1]装甲兵工程学院装备再制造工程系,北京100072 [2]海洋腐蚀与防护国防科技重点实验室,山东青岛266071

出　　处：《材料工程》2012年第11期18-22,共5页Journal of Materials Engineering

摘　　要：研究了Ga含量对Al-Zn-In-Mg-Ga-Mn牺牲阳极性能的影响规律及其在干湿交替条件下的活化机制。结果表明:Ga含量在0.02%(质量分数)时,Al-Zn-In-Mg-Ga-Mn牺牲阳极在干湿交替环境下综合电化学性能最佳。金相组织观察和腐蚀产物EDS分析得出,随着Ga含量的增加,Ga在晶界处富集,由于Ga的活化作用,晶界处优先溶解造成晶粒的脱落,电流效率急剧下降;活性元素Ga和In在溶解反应时发生共同沉积现象,破坏了基体表面氧化膜的完整性和致密性,有效地维持了阳极的活性溶解。The activation mechanism of anodes under condition of wet and dry cycle and effect of Ga content on anodes performance of Al-Zn-In-Mg-Ga-Mn was investigated.The results show that the anodes performance of Al-Zn-In-Mg-Ga-Mn under condition of wet and dry cycle is best when the Ga content is 0.02%（mass fraction）.With the increase of Ga content,Ga is enriched at the grain boundary where was dissolution firstly because activation of Ga,which resulted grain flaked away and its current efficiency decreased.In the process of anodes dissolution,Ga and In both redeposited on the surface of anodes and oxide film was destroyed which promoted anodes to dissolve efficiency.

关 键 词：Al-Zn-In-Mg-Ga-Mn牺牲阳极 电化学性能 干湿交替 沉积 

分 类 号：TG171[金属学及工艺—金属表面处理]