Multiscale investigation of corrosion damage initiation and propagation in AA7075-T651 alloy using correlative microscopy

Sridhar Niverty, Chaitanya Kale, Kiran N. Solanki, Nikhilesh Chawla

Research output: Contribution to journalArticlepeer-review

Abstract

The evolution of the overall microstructure and contribution of constituent second phase particles during the accelerated corrosion of AA 7075-T651 warrants further scrutiny. A correlative microscopy-based approach was employed to study corrosion damage evolution in the microstructure of AA 7075-T651 subjected to potentiodynamic polarization. X-ray Computed Tomography (XCT) and scanning electron microscopy were used to track corrosion damage initiation and propagation globally and at specific regions of the microstructure starting from the first breakdown potential. Additionally, Focused Ion Beam and Electron Backscattered Diffraction were used to investigate local corrosion processes such as pitting and intergranular corrosion. Interesting concentric corrosion patterns, Fe-rich intermetallic particle dissolution and exfoliation corrosion were observed and mechanisms for the same have been proposed.

Original languageEnglish (US)
Article number109429
JournalCorrosion Science
Volume185
DOIs
StatePublished - Jun 2021

Keywords

  • Concentric corrosion patterns
  • Correlative microscopy
  • Exfoliation corrosion
  • Localized corrosion
  • Potentiodynamic polarization

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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