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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 7    July 2015

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Through-thickness inhomogeneity of localized corrosion in 7050-T7451 Al alloy thick plate
FENG Lei(丰雷)1, PAN Qing-lin(潘清林)1, WEI Li-li(韦莉莉)1, HUANG Zhi-qi(黄志其)2, LIU Zhi-ming(刘志铭)2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Guangdong Fenglu Aluminium Co. Ltd., Foshan 528133, China

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.

 

Key words: aluminium; polarization; electrochemical impedance spectroscopy (EIS); intergranular corrosion; exfoliation corrosion; stress corrosion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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