Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Influence of Retrogression and Re-aging on the Exfoliation Corrosion Behavior of AA 7085 Sheets

  • Krishnan, Ajay (Department of Metallurgical Engineering & Materials Science, Indian Institute of Technology Bombay) ;
  • Raja, V.S. (Department of Metallurgical Engineering & Materials Science, Indian Institute of Technology Bombay) ;
  • Mukhopadhyay, A.K. (Defence Metallurgical Research Laboratory)
  • Received : 2016.01.28
  • Accepted : 2016.07.05
  • Published : 2016.08.31
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Abstract

An attempt has been made to understand the influence of retrogression and re-aging (RRA) on the exfoliation corrosion behaviour of AA 7085 alloy in comparison with the peak aged condition (PA). Immersion tests using ASTM G34 and studies involving electrochemical impedance spectroscopy showed that the RRA treated alloy provided higher resistance to exfoliation corrosion than the PA treated alloy. The improved resistance was attributed to the enhanced Cu content and the discontinuous nature of the grain boundary precipitate, which was revealed through transmission electron microscopy.

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