Formation of complex anodic films on porous alumina matrices |
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Authors: | Alexander Zahariev Assen Girginov |
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Affiliation: | (1) Department of Physical Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski blvd., 1756 Sofia, Bulgaria |
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Abstract: | The kinetics of growth of complex anodic alumina films was investigated. These films were formed by filling porous oxide films
(matrices) having deep pores. The porous films (matrices) were obtained voltastatically in (COOH)2 aqueous solution under various voltages. The filling was done by reanodization in an electrolyte solution not dissolving
the film. Data about the kinetics of reanodization depending on the porosity of the matrices were obtained. On the other hand,
the slopes of the kinetic curves during re-anodization were calculated by two equations expressing the dependence of these
slopes on the ionic current density. A discrepancy was ascertained between the values of the calculated slopes and those experimentally
found. For this discrepancy a possible explanation is proposed, related to the temperature increase in the film, because of
that the real current density significantly increases during re-anodization. |
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Keywords: | Complex anodic alumina films reanodization pore filling |
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