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The solution pH does not affect the initiation of pits in neutral solution but appears to affect in acid solution; the apparent effect in acid solution may be ascribed to the degree of association of SO42and H+ which decreases with pH. The Tafel line of the pit initiation differes between the passive passive potential region and the trans-passive potential region, though its slope remains constant; in the latter potential region the pit-initiation is hindered by CrO42ion produced by trans-passive dissolution of the alloy. From these results it is concluded that it is co-existing anions rather than hydrogen ion which determines the chloride-breakdown of the passivity of stainless steel. The initiation of pits also appears to depend on the aging or thickness of the passivation film, its rate decreasing with extending the time of passivation.

Initiation of Chloride-Pitting Corrosion of Austenitic Stainless Steel in Sulphate Solution