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Characterization of passive films on zinc electrodes by impedance measurements and XPS

✍ Scribed by H. Mishima; Lopez de Mishima; E. Santos; C.P. De Pauli; K. Azumi; N. Sato

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
766 KB
Volume
36
Category
Article
ISSN
0013-4686

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✦ Synopsis

The behaviour of the passivating layers formed by anodic polarization on zinc electrodes in borate and arsenate and in borate arsenate mixture solutions of pH 8.9 was studied by means of impedance measurements and XPS analysis. An equivalent circuit for the system is employed for the data fitting. Since an analysis based on the Mott-Schottky relationship leads to an excessively high carrier density with respect to the corresponding resistivity value, the potential drop should occur through the whole passive film. In accordance with the XPS results, a model can be proposed consisting of a layer of hydrated zinc oxide which should be responsible for the passivation. The passivating film on zinc electrodes has a more protective effect when it is formed in borate 0.1 M and arsenate 0.1 M solutions than in arsenate 0.5 M solutions.

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