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.
CITATION STYLE
Li, J., Birbilis, N., & Buchheit, R. G. (2015). Electrochemical assessment of interfacial characteristics of intermetallic phases present in aluminium alloy 2024-T3. Corrosion Science, 101, 155–164. https://doi.org/10.1016/j.corsci.2015.09.012
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