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

  • Li J
  • Birbilis N
  • Buchheit R
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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.

Author-supplied keywords

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

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