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 language | English |
|---|---|
| Pages (from-to) | 155-164 |
| Number of pages | 10 |
| Journal | Corrosion Science |
| Volume | 101 |
| DOIs | |
| State | Published - 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)