Special issue article
Investigation of dealloying by ultra-high-resolution nanotomography
Article first published online: 26 NOV 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Surface and Interface Analysis
Special Issue: Aluminium Surface Science and Technology
Volume 45, Issue 10, pages 1548–1552, October 2013
How to Cite
Hashimoto, T., Curioni, M., Zhou, X., Mancuso, J., Skeldon, P. and Thompson, G. E. (2013), Investigation of dealloying by ultra-high-resolution nanotomography. Surf. Interface Anal., 45: 1548–1552. doi: 10.1002/sia.5176
- Issue published online: 5 SEP 2013
- Article first published online: 26 NOV 2012
- Manuscript Accepted: 14 OCT 2012
- Manuscript Revised: 9 OCT 2012
- Manuscript Received: 27 JUN 2012
Sequential sectioning and sequential imaging by scanning electron microscopy have been employed to obtain three-dimensional images of an AA2024-T3 aluminium alloy after exposure to sodium chloride solution. The three-dimensional arrangement of intermetallic particles within the alloy was disclosed, indicating that groupings of intermetallics are preferential sites for corrosion initiation due to the combined presence of defects such as cracks or voids and local differences in electrochemical potential. Three-dimensional imaging enabled the study of the dealloying process occurring on the S-phase particles (Al–Cu–Mg) during corrosion, revealing the details of a copper-rich sponge-like structure. Initially, dealloying proceeds by initial formation of a copper-rich nanoporous layer containing significant amounts of residual aluminium and magnesium. Subsequently, the layer dealloys further, increasing the free volume of the porous structure. At later stages of dealloying, some copper metal clusters detach from the substrate and oxidize. Copyright © 2012 John Wiley & Sons, Ltd.