Repassivation currents measured for stainless steel (SS) scratched at constant potential in sulfuric acid and sulfate solutions are analyzed in terms of model equations derived for different rates of film removal and reformation. For times longer than the duration of scratching, the current decrease can be described by the normal log l-log t relationship, but for shorter times, more complex equations apply. An equation in the form I = A0 + A1 log (y/y +1), where y is the ratio between the time elapsed after scratching and the duration of scratching, is sufficiently accurate in most cases.
National Association of Corrosion Engineers
1988
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