Effects of Gallium Addition on the Microstructure and Electrochemical Properties of Al-Zn-Bi Series Alloy Anode
The open circuit potential, working potential and current efficiency of Al-5Zn-0.5Bi and Al-5Zn-0.5Bi-0.015Ga alloys in artificial seawater were tested by constant current method. The corrosion characteristics of the anode alloys in 3.5％ NaCl solution were studied by polarization curves and electrochemical impedance spectra. The surface corrosion morphology and microstructures of the alloys were observed and investigated by metallographic microscopy, scanning electron microscopy and X-ray energy dispersive analysis. The results show that the open circuit potential shifts towards negative, working potential becomes stable and the current efficiency becomes high through the addition of gallium in the alloy. Gallium can be uniformly dissolved in aluminum alloy and effectively reduce the segregation of Bi. The cations can deposit back to the anode surface forming into the Ga-Al amalgam, which promotes its homogeneous dissolution and improve comprehensive electrochemical performance.
Al-Zn-Bi alloy electrochemical properties electrochemical impedance spectroscopy Ga-Al amalgam
Qingguo HAO Jiuba WEN Junguang HE Jingling MA
School of Mat. Sci. & Eng., Henan University of Science and Technology, Luoyang 471003, China School of Mat. Sci. & Eng., Henan University of Science and Technology, Luoyang 471003, China Henan
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
107-112
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）