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

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• 作者：Lei Feng ; Qing-lin Pan ; Li-li Wei …
• 关键词：aluminium ; polarization ; electrochemical impedance spectroscopy (EIS) ; intergranular corrosion ; exfoliation corrosion ; stress corrosion
• 刊名：Journal of Central South University of Technology
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：22
• 期：7
• 页码：2423-2434
• 全文大小：12,324 KB
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• 作者单位：Lei Feng (1)
  Qing-lin Pan (1)
  Li-li Wei (1)
  Zhi-qi Huang (2)
  Zhi-ming Liu (2)
  
  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China
  2. Guangdong Fenglu Aluminium Co. Ltd., Foshan, 528133, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223

文摘

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.