Species separation during coating growth on aluminium by spark anodizing
| Autor: | Peter Skeldon, A. Berkani, Kenichi Shimizu, G.E. Thompson, Endzhe Matykina, Hiroki Habazaki, F. Monfort |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Silicon Anodizing Metallurgy technology industry and agriculture chemistry.chemical_element Surfaces and Interfaces General Chemistry Electrolyte engineering.material equipment and supplies Condensed Matter Physics Silicate Surfaces Coatings and Films Metal chemistry.chemical_compound Coating chemistry Chemical engineering Aluminium visual_art Materials Chemistry engineering visual_art.visual_art_medium Layer (electronics) |
| Zdroj: | Surface and Coatings Technology. 201:8671-8676 |
| ISSN: | 0257-8972 |
| Popis: | The mechanism of coating growth during sparking anodizing of aluminium is probed by use of an electrolyte containing both silicate and phosphate ions, with subsequent determination of the locations of silicon and phosphorus species through the coating thickness. Importantly, the main alumina-based layer of the coating contains incorporated silicon and phosphorus species of differing distributions. Phosphorus species are primarily found in a region next to the metal, representing roughly about 30% of the layer thickness. Silicon species are located mainly above this region to the layer surface. New coating material is added in discreet amounts associated with breakdown events, which provide short-circuit paths through the layer. The growth processes within the discharge region result in separation of the silicate- and phosphate-derived species, which may relate to their different mobilities, dependent upon factors such as charge, size and bonding with other species. Further, silicon-rich material is deposited at the surface of the alumina-based layer, which is often encountered in spark anodizing in silicate electrolyte. |
| Databáze: | OpenAIRE |
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