Electrical behaviour, characteristics and properties of anodic aluminium oxide films coloured by nickel electrodeposition
| Autor: | Virginie Vilar, Gaël Zamora, Laurent Arurault, R. S. Bes, Peter Winterton |
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| Přispěvatelé: | Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Mechanical Engineering Matériaux Metallurgy chemistry.chemical_element Substrate (electronics) Electrolyte engineering.material Anode Barrier layer chemistry.chemical_compound Nickel chemistry Coating Electrodeposition Mechanics of Materials Aluminium Cathodic Aluminium oxide engineering General Materials Science Composite material |
| Zdroj: | Journal of Materials Science. |
| ISSN: | 1573-4803 |
| Popis: | Porous anodic films on 1050 aluminium substrate were coloured by AC electrodeposition of nickel. Several experiments were performed at different deposition voltages and nickel concentrations in the electrolyte in order to correlate the applied electrical power to the electrical behaviour, as well as the characteristics and properties of the coatings. The content of nickel inside the coatings reached 1.67 g/m2, depending on the experimental conditions. According to the applied AC voltage in comparison with the threshold voltage U t, the coating either acted only as a capacitor when U U t, the behaviour during the anodic and cathodic parts of the power sine wave was different. In particular, due to the semi-conducting characteristics of the barrier layer, additional oxidation of the aluminium substrate occurred during the anodic part of the electrical signal, whilst metal deposition (and solvent reduction) occurred during the cathodic part; these mechanisms correspond to the blocked and pass directions of the barrier layer/electrolyte junction, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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