中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 No. 7 July 2011 |
Al-Zn-Sn sacrificial anodes
（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
