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

48 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

Funding Information:
This research is sponsored by the U.S. Air Force Academy under agreement number FA7000-12-2-0015. The U.S. Government is authorized to reproduce and distribute reprints for governmental purposes notwithstanding any copyright notation thereon. The views and conclusion contained herein are those of the authors and should not be interpreted as necessarily represented official policies or endorsement, either expressed or implied, of the U.S. Air Force Academy or the U.S. Government. Additionally, the authors gratefully acknowledge CEMAS for SEM images.

Publisher Copyright:
© 2015 Elsevier Ltd.

Keywords

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

ASJC Scopus subject areas

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

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