Volume Expansion Factor and Growth Efficiency of Anodic Alumina Formed in Sulphuric Acid
| Autor: | Peter Skeldon, George Thompson, A. Baron-Wiechec, Hiroki Habazaki, A. K. Mohamed Al-Zenati, Fan Zhou, Michele Curioni, S.J. Garcia-Vergara |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment 020209 energy Metallurgy chemistry.chemical_element 02 engineering and technology Electrolyte 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode chemistry Chemical engineering Aluminium 0202 electrical engineering electronic engineering information engineering Materials Chemistry Constant current Current (fluid) 0210 nano-technology Current density Dissolution |
| Zdroj: | Journal of The Electrochemical Society. 158:C202-C214 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.3578028 |
| Popis: | The growth of anodic alumina in sulphuric acid is investigated at constant current on bulk and sputtering-deposited aluminium. The ratio of the thickness of the film to the thickness of oxidized aluminium is shown to increase with increase of the current density (from 0.5 to 50 mA cm−2) and with decrease of the electrolyte temperature (from 20 to 0°C). In addition, the sulphur content of the films and the efficiency of film formation increase. It is suggested that pores are generated primarily by dissolution at current densities below ∼2 mA cm−2, with flow of film material dominating at higher current densities. |
| Databáze: | OpenAIRE |
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