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Characterization of Localized Corrosion in an Al-Cu-Li Alloy

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Abstract

Corrosion behaviors of recently developed 2A97-T6 aluminum-copper-lithium alloy in sodium chloride solution are investigated using scanning electron and transmission electron microscopies in conjunction with electron backscatter diffraction. It has been found that corrosion product rings were established on the alloy surface as early as 5 min during immersion in sodium chloride solution. Meanwhile, hydrogen continuously evolved from within the rings. Pitting corrosion is evident with crystallographic dependant corrosion channel facets mainly parallel to {100} planes. Non-uniform distribution of misorientation in the 2A97 aluminum alloy results in a portion of grains of relatively high stored energy. Such grains were preferentially attacked, serving as local anodes, during the development of crystallographic pitting.

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Acknowledgement

The authors wish to thank the National Natural Science Foundation of China Program Grant (No. 51201157) and National Defense Technology Foundation Project (H052013A003) for provision of financial support for the work.

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Authors and Affiliations

  1. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials, AVIC Beijing Institute of Aeronautical Materials, Beijing, 100095, People’s Republic of China

    Chen Luo, Zhihua Sun, Xiaoyun Zhang, Zhihui Tang & Feng Lu

  2. School of Materials, The University of Manchester, Manchester, M13 9PL, UK

    Xinxin Zhang, Xiaorong Zhou & George E. Thompson

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  1. Chen Luo
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  2. Xinxin Zhang
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  3. Xiaorong Zhou
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Correspondence to Chen Luo.

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Luo, C., Zhang, X., Zhou, X. et al. Characterization of Localized Corrosion in an Al-Cu-Li Alloy. J. of Materi Eng and Perform 25, 1811–1819 (2016). https://doi.org/10.1007/s11665-016-2010-y

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  • DOI: https://doi.org/10.1007/s11665-016-2010-y

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