Abstract
The influence of the surface roughness(Ra) on the metastable pitting potential(Em) and the stable pitting potential(Eb) as well as on the growth mechanism of metastable pittings was studied by analyzing the current fluctuations at the early stages of pitting corrosion for 316 L stainless steel with three level of surface roughness. The results show that as lg Raincreases both Emand Eb values decrease linearly. With the increase in surface roughness, the average nucleation rate and lifetime of metastable pits decrease while its growth rate shows little change. But by the same growth rate the metastable pits on the steel with larger surface roughness has bigger sustained growth ability, which in combination with the accumulated corrosion damage resulted from high nucleation rate may be beneficial to the transformation of metastable pits into stable pits.
Published Version
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