The pit generation rate (g) on stainless steel (SS) in natural seawater was analyzed according to the stochastic theory. Under the experimental conditions with statistical measurements taken using a potentiokinetic method, two processes were revealed. The first process, with the highest rate, controlled pit generation to a certain value of the open-circuit potential (EOC). This corresponded to a modification of the passive film with an enrichment in chromium in the inner layer. Results revealed that a critical EOC (~ 65 mVSCE) played a significant role in enhancing pitting corrosion resistance.

Subject
Pits, Immersion tests, Potential differences, Composition, Passive films, Natural seawater, Seawater, X-ray spectroscopy, Pitting, Immersion, Aging, Electrode potential, Samples
Keywords:
chromium, films and film formation, marine corrosion, microbiologically influenced corrosion, passivity, pitting corrosion, pitting potential, potentiokinetic testing, seawater, stochastic theory
NACE International
1996
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