The Structure and Impurities of Hard DC Anodic Layers on AA6060 Aluminium Alloy
| Autor: | Fabrice Lapique, C. J. Simensen, John C. Walmsley, Astrid Bjørgum, Keith Redford |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Anodizing Alloy technology industry and agriculture Analytical chemistry Oxide Intermetallic Surfaces and Interfaces General Chemistry engineering.material equipment and supplies Surfaces Coatings and Films Secondary ion mass spectrometry chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Sputtering visual_art Materials Chemistry engineering Aluminium alloy visual_art.visual_art_medium Surface layer |
| Zdroj: | The Journal of Adhesion. 84:543-561 |
| ISSN: | 1545-5823 0021-8464 |
| Popis: | Hard anodic layers produced under DC conditions in sulphuric acid on a commercial AA 6060 aluminium alloy have been characterised by electron microscopy and secondary ion mass spectroscopy (SIMS). Once exposed during anodising, α–Al(Fe, Mn)Si intermetallic particles start to corrode in the electrolyte. Partially corroded particles become trapped in the oxide, disturbing the local pore structure. This leads to pyramidal defects on the alloy surface and retention of isolated, unmodified fragments of alloy in the oxide. Sealing in boiling water left a low density, loosely attached surface layer of modified oxide that gave poor adhesion properties. The bulk oxide pore structure was modified by a uniform, fine network of bridges that extended down the barrier layer. Calibration of the SIMS sputtering rate allowed the concentration of alloying and impurity elements to be measured as a function of depth in the oxide and into the alloy. |
| Databáze: | OpenAIRE |
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