Electrochemical assessment of interfacial characteristics of intermetallic phases present in aluminium alloy 2024-T3

Jichao Li, Nick Birbilis, Rudolph G. Buchheit

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Impedance spectra for the secondary phase particles that populate in aluminium alloy 2024-T3 are presented. Such impedance data using an electrochemical microcell have not been previously reported, and were possible via a fast Fourier transform-based technique. The interfacial characteristics of intermetallic particles in NaCl and chromate solutions were described by a simplified Randles circuit. Impedance analysis, along with anodic polarization, demonstrated that Al2CuMg (S-phase) showed the highest dissolution propensity, while the other phases studied were net cathodes. Based on the capacitance measurements determined, the dealloying of S-phase was evaluated in-situ.

Original languageEnglish
Pages (from-to)155-164
Number of pages10
JournalCorrosion Science
Volume101
DOIs
StatePublished - Dec 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd.

Keywords

  • A. Intermetallics
  • B. EIS
  • B. Polarisation
  • C. Passive films

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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