ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 21    No. 7    July 2011

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Influence of Ga and Bi on electrochemical performance of
Al-Zn-Sn sacrificial anodes
HE Jun-guang1, 2, WEN Jiu-ba2, LI Xu-dong1, WANG Guo-wei2, XU Chun-hua2
(1. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China
)
Abstract: 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.
Key words: aluminium; sacrificial anode; electrochemical performance; electrochemical impedance spectroscopy; segregation
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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