Abstract
The roles of the crevice opening dimension, a, and the oxidizing potential, E sub surf , on the stability of crevice corrosion were investigated in the Ni/1 N H sub 2 SO sub 4 system. The electrode potential and location of the passive/active boundary, x sub pass , inside the crevice were measured. The boundary, x sub pass , moved into the crevice for both increasing a and increasing oxidizing potential. These observations were found to be in close agreement with the IR voltage drop theory. The susceptibility of the system to crevice corrosion decreased as both the crevice opening dimension and the oxidizing potential increased. The crevice corrosion current increased gradually and resulted in the motion of x sub pass towards the crevice opening.