ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION

金属学报(英文版), 2004, 17(6): 894-901.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.College of Materials Science and Engineering, Central South University, Changsha 410083, China;Department of Chemistry, Zhejiang University, Hangzhou 310027, China

2.College of Materials Science and Engineering, Central South University, Changsha 410083, China

3.College of Materials Science and Engineering, Central South University, Changsha 410083, China

4.College of Materials Science and Engineering, Central South University, Changsha 410083, China

5.Department of Chemistry, Zhejiang University, Hangzhou 310027, China

6.Department of Chemistry, Zhejiang University, Hangzhou 310027, China;State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China

基金项目: 国家自然科学基金(50271066) 国家重点基础研究发展计划(973计划)(G19990650)

ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION

Keywords： 8090 Al-Li alloy

The corrosion behavior and electrochemical impedance spectroscopy ( EIS) features of 8090 Al-Li alloys in EXCO solution were investigated, and the EIS was simulated using an equivalent circuit. At the beginning of immersion in EXCO solution, the EIS is comprised by a depressed capacitive arc at high-mediate frequency and an inductive arc at low frequency, and the inductive component decreases and disappears with immersion time. Once exfoliation or severe pitting corrosion is produced, two capacitivearcs appear in the EIS. These two capacitive arcs are originated from the two parts of the corroded alloy surface, the original flat alloy surface and the new inter-face exposed to the aggressive EXCO solution due to the exfoliation or pitting corrosion.Some corrosion development features of 8090 Al-Li alloys in EXCO solution can be obtained through simulated EIS information.

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ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION

参考文献