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Electrical behaviour, characteristics and properties of anodic aluminium oxide films coloured by nickel electrodeposition

Arurault, Laurent and Zamora, Gaël and Vilar, Virginie and Winterton, Peter and Bes, René Electrical behaviour, characteristics and properties of anodic aluminium oxide films coloured by nickel electrodeposition. (2010) Journal of Materials Science, 45 (10). 2611-2618. ISSN 1573-4803

(Document in English)

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Official URL: http://dx.doi.org/10.1007/s10853-010-4235-8


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 Ut, the coating either acted only as a capacitor when U\Ut and, when U[Ut, 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.

Item Type:Article
Additional Information:Thanks to Springer Netherlands editor. The definitive version is available at http://www.springerlink.com/ The original PDF of the article can be found at Journal of Materials Science website : http://www.springerlink.com/content/r178280n341g1337/
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:26 Jan 2011 11:18

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