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Through-thickness inhomogeneity of localized corrosion in 7050-T7451 Al alloy thick plate

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Abstract

The through-thickness corrosion inhomogeneity of 7050-T7451 Al alloy thick plate was studied using immersion tests, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), slow strain rate testing (SSRT) technique combined with optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the through-thickness corrosion resistance is ranked in the order of T/2>surface>T/4. And the 75 mm-thick 7050 alloy plate presents better corrosion resistance than the 35 mm-thick plate. The results are discussed in terms of the combined effect of recrystallization and cooling rate in quenching. Alloy with lower volume fraction of recrystallization and smaller grain aspect ratio displays better corrosion resistance. The lower corrosion resistance caused by the slower cooling rate results from the higher coverage rate of grain boundary precipitates and larger width of precipitate free zone.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Lei Feng  (丰雷), Qing-lin Pan  (潘清林) & Li-li Wei  (韦莉莉)

  2. Guangdong Fenglu Aluminium Co. Ltd., Foshan, 528133, China

    Zhi-qi Huang  (黄志其) & Zhi-ming Liu  (刘志铭)

Authors
  1. Lei Feng  (丰雷)
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  2. Qing-lin Pan  (潘清林)
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  3. Li-li Wei  (韦莉莉)
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  4. Zhi-qi Huang  (黄志其)
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  5. Zhi-ming Liu  (刘志铭)
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Corresponding author

Correspondence to Qing-lin Pan  (潘清林).

Additional information

Foundation item: Project(2012CB619503) supported by the National Basic Research Program of China; Project(2013AH100055) supported by the Foshan Civic Technological Innovation Foundation, China

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Feng, L., Pan, Ql., Wei, Ll. et al. Through-thickness inhomogeneity of localized corrosion in 7050-T7451 Al alloy thick plate. J. Cent. South Univ. 22, 2423–2434 (2015). https://doi.org/10.1007/s11771-015-2769-2

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  • DOI: https://doi.org/10.1007/s11771-015-2769-2

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