Acta Metall Sin  2005, Vol. 41 Issue (9): 974-978     DOI:

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EXFOLIATION CORROSION BEHAVIOR OF T6 TREATED 2090 Al-Li ALLOY IN EXCO SOLUTION AND EIS DURING EXFOLIATION CORROSION EVOLUTION

SU Jingxin; ZHANG Zhao; CAO Fahe; ZHANG Jianqing; CAO Chunan

Department of Chemistry; Zhejiang University; Hangzhou 310027

SU Jingxin; ZHANG Zhao; CAO Fahe; ZHANG Jianqing; CAO Chunan. EXFOLIATION CORROSION BEHAVIOR OF T6 TREATED 2090 Al-Li ALLOY IN EXCO SOLUTION AND EIS DURING EXFOLIATION CORROSION EVOLUTION. Acta Metall Sin, 2005, 41(9): 974-978 .

Abstract References Related Articles Recommended Metrics Download:  PDF(265KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Electrochemical impedance spectroscopy (EIS) and in situ microscopic image of T6 peak-aged AA2090 Al-Li alloys in EXCO solution were studied. The localized corrosion form of the alloy during immersion evolved from pitting through intergranular corrosion, exfoliation corrosion (EC) to post EC. EC initiated at big corrosion pits which were formed with inclusion phase as center in pitting stage. The EC blisters propagate from these big pits till the upper layer is totally lifted. EIS of the initiation stage of pitting corrosion consists of a high frequency capacitive arc and a middle-low frequency inductive arc, and the inductive arc tends to disappear when pitting corrosion starts to propagate. In the intergranular corrosion stage, the second time constant corresponding to the corroded area can hardly be distinguished in the capacitive part of the EIS. In the stages of EC propagation and post EC, their EIS consist of two capacitive arcs. Key words:  Al-Li alloy      electrochemical impedance spectroscopy (EIS)      EXCO solutio       Received:  18 January 2005      ZTFLH:  TG174.3     O646   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors SU Jingxin ZHANG Zhao CAO Fahe ZHANG Jianqing CAO Chunan URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I9/974 [1] Liu J A, Zhu X W. Light Alloy Fabr Technol, 1996; 24(5): 2 (刘静安,朱献文．轻合金加工技术, 1996;24(5):2) [2] He J P, Chen W L, Xu W, Fan W X. J Nanjing Univ Aeronaut Astronaut, 1999; 31: 575 (何建平,陈文理,许玮,樊蔚勋．南京航空航天大学学报, 1999;31:575) [3] He B, Sun Y C, Fan W X. J Nanjing Univ Aeronaut Astronaut, 1998; 30: 306 (贺斌,孙有朝,樊蔚勋．南京航空航天大学学报,1998;30: 306) [4] ASTM G34-79.Exfoliation Corrosion Susceptibility in 2xxx and 7xxx Series Aluminum Alloys (EXCO test), 1999 [5] Kelly D J, Robinson M J. 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