2007 Volume 56 Issue 2 Pages 56-61
Incubation time for crevice corrosion of stainless steels in environments containing chloride ions such as sea water was evaluated by potentiostatic methods. Current density of specimens with and without crevice were measured at a current - time curve just after polish of the sample's surface. And, dependence of QINCU (amount of dissolved metal ions during estimated incubation time) and tINCU ( estimated incubation time for crevice corrosion) on potential were clarified by the experiments above.
The tINCU was decreased with increasing potentials. On the other hand, QINCU was almost independent of potentials. Decrease of tINCU with increasing potentials was due to increase of iINCU with potential. Amount of dissolved metal ions required for occurrence of crevice corrosion and depassivation pH which is fundamental cause for crevice corrosion are found to be almost independent of potential.