Effect of the anionic composition of an electrolyte on the rate of anodic ionization of nonpassivated metals

We show that a limiting current of diffusion nature is observed on the anodic polarization curves of iron and its analogs in relatively dilute acid solutions. The values of this current do not depend directly on the pH of the solution, but are related to the anion concentration. The last feature for...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) N.Y.), 2006-09, Vol.42 (5), p.579-583
Main Authors: Tkalenko, D A, Byk, M V, Harbuz, V M, Vyshnevs'ka, Yu P
Format: Article
Language:English
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Summary:We show that a limiting current of diffusion nature is observed on the anodic polarization curves of iron and its analogs in relatively dilute acid solutions. The values of this current do not depend directly on the pH of the solution, but are related to the anion concentration. The last feature formed the basis of the hypothesis that the limiting current is determined by the delivery rate of anions, which take part in the neutralization of positive charge of the formed metal cations, to the surface of the electrode. This hypothesis envisages the formation of such labile particles as ion pairs or cation-anion complexes in the course of anodic dissolution of iron.
ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-006-0119-0