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| ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION | |
| 作者姓名： | J.F. Li Z.Q. Zheng C.Y. Tan S.C. Li Z Zhang and J.Q. Zhang College of Materials Science and Engineering Central South University Changsha China |
| 作者单位： | J.F. Li1，2)，Z.Q. Zheng1)，C.Y. Tan1)，S.C. Li1)，Z Zhang2) and J.Q. Zhang2，3) 1) College of Materials Science and Engineering，Central South University，Changsha 410083，China2) Department of Chemistry，Zhejiang University，Hangzhou 310027，China3) 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，国家重点基础研究发展计划(973计划) |
| 摘 要： | 1.IntroductionAl-Li alloys, compared to traditional Al alloys, have more excellent properties, such as lower density, greater elastic modulus and higher specific strength1,2]. In the near future, they would be widely applied to airplane structures. While, exfoliation, a main kind of localized corrosion, lowers their strength, plasticity and fatigue properties, and also decreases their service life3, 4]. So investigating their exfoliation would be very important to their application.Usua… |
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION |
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| J.F. Li,,Z.Q. Zheng,C.Y. Tan,S.C. Li,Z Zhang and J.Q. Zhang, College of Materials Science and Engineering,Central South University,Changsha ,China.ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY DURING CORROSION PROCESS OF 8090 Al-Li ALLOY IN EXCO SOLUTION[J].Acta Metallurgica Sinica(English Letters),2004,17(6). | |
| Authors: | JFLi ZQZheng CYTan SCLi ZZhang JQZhang |
| Affiliation: | 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. Department of Chemistry, Zhejiang University, Hangzhou 310027, China 4. 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 |
| Abstract: | 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 im- mersion time. Once exfoliation or severe pitting corrosion is produced, two capacitive arcs 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. |
| Keywords: | Al-Li alloy exfoliation electrochemical impedance spectros- copy (EIS) EXCO solution |
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