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Sociedade Brasileira de Química, Química Nova, 2(32), p. 387-390

DOI: 10.1590/s0100-40422009000200022

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Kinetic measurements during transient film growth on zinc

Journal article published in 2009 by Yun Chen, Chen,Yun, Rui F. M. Lobo, Lobo,Rui F. M., Diogo M. F. Santos ORCID, Santos,Diogo M. F., César A. C. Sequeira ORCID, Sequeira,César A. C.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The electrochemical behaviour of zinc has been extensively studied in alkaline and acid media, but only a few studies have been reported in neutral solutions, particularly in deaerated media. Zinc passivation in neutral medium and the effect of the ClO4- ion on the nucleation and growth of the passive layer is studied in this paper by a transient technique at different electrolyte concentrations and applied potentials. ZnO growth rate was shown to decrease with increasing electrolyte concentration. Moreover, passive layer growth occurred followed by pitting nucleation and growth. Film growth and pit nucleation are explained by means of the Macdonald and Engell-Stolica models.