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Distribution functions for the breakdown of passive films

✍ Scribed by Digby D. Macdonald; Mirna Urquidi-Macdonald

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
737 KB
Volume
31
Category
Article
ISSN
0013-4686

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✦ Synopsis

A deterministic treatment is presented of the statistical nature of the breakdown of passive films on metal surfaces, in which it is assumed that breakdown sites on the surface are normally distributed in terms of the cation vacancy diffusivity (D) or log D. This analysis, which is based on the point defect model for the breakdown of passive films, predicts normal or near-normal distributions in the breakdown voltage, depending upon whether it is log D or D that is normally distributed. The model also yields distribution functions for the induction time that mimic the highly asymmetric form exhibited by experimental data. By using values for D, log D and their associated standard deviations, determined from the distributions in the breakdown voltage, the point defect model is able to account quantitatively for the experimentally observed distributions in the induction time for the breakdown of passive lilms on Fe17Cr in 3.5 "/, NaCl solution at 3O"C, as reported by Shibata[l].

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