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| ELECTROCHEMICAL BEHAVIOR OF THESIMULATED Al2Zn SEGREGATION IN 3%NaCl SOLUTION |
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| 华中科技大学化学系 |
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Abstract Simulated Al2Zn segregation alloys were developed according to the average elements distribution of zinc enriched zones of Al-Zn-In alloy. Open circuit potential against time,polarization curves,and electrochemical impedance spectroscopy were employed to study the electrochemical behavior of Al-Zn-In and simulated Al2Zn alloys. The results showed that the simulated Al2Zn alloy exhibits a more electronegative open circuit potential and a lower self-corrosion rate as compared with those of Al-Zn-In alloy. However,the Al2Zn segregation in Al-Zn-In alloy can be attributed to the formation of micro-local galvanic corrosion that leads to the preferential dissolution of Al2Zn and the loss of current efficiency.
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Received: 14 October 2005
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