EFFECT OF PRETREATMENT POTENTIALS ON PIT GENERATION OF INCOLOY-800

Pit generation of Incoloy 800 in a 3. 5%NaCl solution was analyzed on the basis of a stochastic theory. A parallel combination of several processes was found to be included in the pit generation at a constant potential. The critical pitting potential which does not depend on the pretreatment potential and the potential sweep velocity can be determined when the pretreatment potential is more noble than minus 0. 10 V.