Pit incubation at passive iron-nickel alloys as a stochastic process
✍ Scribed by Eng.; (Mrs.) N. B. De Cristofaro; Prof. Dr. rer. nat. K. E. Heusler
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- German
- Weight
- 591 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0947-5117
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✦ Synopsis
Abstract
The distribution functions of pit incubation times were measured with homogeneous iron‐nickel alloys containing 40, 60, and 90 wt% nickel, respectively, at different electrode potentials in borate buffer, pH 7.5, after addition of 50 mM sodium chloride. The empirical moments of the distribution function are the same as for iron. Considering a general distribution function of the exponential type with a time‐dependent frequency function, the logarithms of its parameters all are linearly related to the reciprocal potential difference towards the critical pitting potential. The same relationship is also observed for the mean incubation times. At constant electrode potential the mean incubation times grow longer with increasing concentration of nickel in the alloy. The critical pitting potentials become more positive with the nickel concentration.
The independence of the kinetics of pit incubation from the nature of the metal indicates a universal mechanism of pit nucleation.