Influence of Ga and Bi on electrochemical performance of Al-Zn-Sn sacrificial anodes  

Ga和Bi对Al-Zn-Sn牺牲阳极电化学性能的影响(英文)

作　　者：贺俊光[1,2] 文九巴[2] 李旭东[1] 王国伟[2] 徐春花[2] 

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]河南科技大学材料科学与工程学院,洛阳471003

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第7期1580-1586,共7页中国有色金属学报（英文版）

基　　金：Project(094200510019) supported by Technology Creative Programmer of Henan for Excellent Talents,China;Project(092300410132) supported by the Natural Science Foundation of Henan Province,China

摘　　要：The influence of Ga and Bi on the microstructure and electrochemical performance of Al-7Zn-0.1Sn （mass fraction,%） sacrificial anodes was investigated by means of optical microscopy （OM）,scanning electron microscopy/energy dispersive X-ray analysis （SEM/EDAX） and electrochemical measurements.It was found that the coarse dendrites structure transformed into the equiaxed grains as well as a small amount of dendrite grains after adding Ga and Bi into Al-Zn-Sn alloys.A high current efficiency of 97% and even corrosion morphology were obtained for Al-7Zn-0.1Sn-0.015Ga-0.1Bi alloy.The results indicate that the proper amount of Ga and Bi is effective on improving the microstructure and electrochemical performance of Al-Zn-Sn alloy.通过光学显微镜(OM)、扫描电镜(SEM)、能谱分析(EDAX)和电化学性能测试等方法,研究了Ga和Bi对Al-7Zn-0.1Sn(质量分数,%)牺牲阳极微观组织和电化学性能的影响。Al-Zn-Sn合金加入Ga和Bi元素后,合金组织由粗大枝晶转变为等轴晶,仅剩下少量枝晶。Al-7Zn-0.1Sn-0.015Ga-0.1Bi合金具有高的电流效率(97%)和均匀的腐蚀形貌,表明添加适量的Ga和Bi元素能有效改善Al-Zn-Sn合金的组织和电化学性能。

关 键 词：aluminium sacrificial anode electrochemical performance electrochemical impedance spectroscopy SEGREGATION 

分 类 号：TG111[金属学及工艺—物理冶金]