Effects of heat treatments on the microstructure and localized corrosion behaviors of AA7075 aluminum alloy

Yida Xiong, Joseph D. Robson, Yichao Yao, Xiangli Zhong, Francesco Guarracino, Artenis Bendo, Zelong Jin, Teruo Hashimoto, Xuzhao Liu, Michele Curioni

Research output: Contribution to journalArticlepeer-review

Abstract

Five different heat treatments were applied to AA7075 aluminum alloy, resulting in distinct localized corrosion behaviors in 5 wt% NaCl solution. Some treatments exhibited higher intergranular corrosion (IGC) susceptibility due to the anodic nature of grain boundaries (GBs) caused by Cu depletion in the precipitate free zones (PFZs) along the GBs. Cu-enrichment and an increase in intervals between η-phase grain boundary precipitates (GBPs) did not improve IGC resistance. The open circuit (OCP) and galvanostatic (GL) tests could distinguish differences in corrosion behaviors, suggesting the potential use of GL testing as a faster method for predicting localized corrosion behaviors.

Original languageEnglish
Article number111361
JournalCorrosion Science
Volume221
Early online date24 Jun 2023
DOIs
Publication statusPublished - 15 Aug 2023

Keywords

  • Aluminum (A)
  • Galvanostatic (B)
  • Intergranular corrosion (C)
  • Segregation (C)
  • SEM (B)
  • STEM (B)

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