Nanoporosity formation by selective dissolution of Ag-5 at. pct Au in perchloric acid has been investigated with regards to the mechanism of stress-corrosion cracking (SCC), film-induced cleavage in particular. It has been proven that dealloying of silver-gold systems containing low concentration of gold leads to the formation of a three dimensional nanoporous layer and that it can be carried out in a broad range of potentials and concentrations of a dealloying solution. Therefore, stress-corrosion cracking observed in these alloys may be caused, initiated or at least accompanied by the formation of nanoporosity resulting from dealloying. These results will have impact on the fabrication of cheaper nanomaterials where there is required large surface to volume ratio with gold as the outermost layer. Understanding the role of dealloying will also help us to design new materials of higher resistance against stress-corrosion cracking.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/32229 |
| Date | 21 March 2012 |
| Creators | Bryk, Mariusz Albert |
| Contributors | Newman, Roger C. |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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