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Volume 27 Issue 1
Jan.  2001
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Journal of Beijing University of Aeronautics and Astronautics  > 2001  >  27(1): 5-8.
HU Yan-ling, LI Di, GUO Bao-lanet al. Study on Evaluation of Localized Corrosion of 2024T3 Aluminum Alloy with EIS[J]. Journal of Beijing University of Aeronautics and Astronautics, 2001, 27(1): 5-8. (in Chinese)
Citation: HU Yan-ling, LI Di, GUO Bao-lanet al. Study on Evaluation of Localized Corrosion of 2024T3 Aluminum Alloy with EIS[J]. Journal of Beijing University of Aeronautics and Astronautics, 2001, 27(1): 5-8. (in Chinese)
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Study on Evaluation of Localized Corrosion of 2024T3 Aluminum Alloy with EIS

  • Beijing University of Aeronautics and Astronautics, Dept. of Materials Science and Engineering

  • Received Date: 12 Oct 1999
  • Publish Date: 31 Jan 2001
    Abstract
  • Alternating immersion test was applied to 2024T3 Al alloy. Electrochemistry Impedance Spectroscopy (EIS) by time domain method was performed on the specimens. Statistic method was also used to deal with data because localized corrosion is a stochastic phenomenon. The results show that the reciprocal of low frequency impedance (1/Rd) was consistent with the Gumbel distribution law. The dynamic variation curve of 1/Rd vs. test period was somewhat of S shape which must be divided into two stages to treat the data, i.e. pitting and intergranular corrosion (Sigmoidal curve) and exfoliation (linear line). Compared with the maximum corrosion depth data (dm) measured by optical microscope, it can be concluded that 1/Rd and dm have similar statistical distribution and time-dependent growth. Quantitative relation between the 1/Rd and dm has been established. According to the relation, EIS by time domain method can enable a nondestructive, quantitative and quick evaluation for localized corrosion of 2024 Al alloy.

     

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  • [1] Dacres C M,Daivis G D,Krebs L A,et al. The use of electrochemistry and ellipsometry for identifying and evaluating corrosion on aircraft. AFOSR-TR-97/AF-A329519,1997. [2] Conde A, De Damborenea J. An electrochemical impedance study of a natural aged Al-Cu-Mg alloy in NaCl[J]. Corrosion Science, 1997, 39(2):295~303. [3] 宋诗哲.腐蚀电化学研究方法[M].北京:化学工业出版社,1994. [4] 胡艳玲. LY12铝合金的腐蚀评估与寿命预测方法研究. 北京:北京航空航天大学材料科学与工程系,1999. [5] 刘永辉,张佩芬.金属腐蚀学原理[M].北京:航空工业出版社,1993. [6] Sammells A F, Bowers J S. Electrochemical impedance pattern recognition for detection of hidden chemical corrosion on aircraft components. AFOSR-94-0608TR/AD-A284998,1994. [7] 张九渊,洪明庚,卢建树,等.孔蚀统计规律的对比研究[J].中国腐蚀与防护学报,1994,14(2):161~167. [8] 贺国芳.可靠性数据的收集与分析[M].北京:国防工业出版社,1991.25~41.
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