Abstract
The metastable pitting behavior of 316L stainless steel with different surface roughness in 0.01 M NaCl solution was studied using potentiostatic and potentiodynamic polarization methods and statistical treatments. As surface roughness decreased, the nucleation rate of metastable pits decreased. The peak current of metastable pits also decreased, but the average growth rate of metastable pits showed a slight increase. The aspect ratio of surface groove, w/ d, was suggested to characterize the openness of surface grooves, in which w is the width of the groove at the opening and d the depth of the groove. Bigger w/ d value indicates more smooth surface, and it is more difficult for micro-pit to nucleate. Under certain conditions of solution and potential, there is a critical w/ d value. Metastable pits may nucleate only on those surfaces whose w/ d values are less than the critical value. As the aspect ratio w/ d increases, the nucleation rate of metastable pits decreases linearly, and both metastable pitting potential E m and pitting potential E p move in the positive direction.
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