Abstract
Potentiostatic investigations of pitting corrosion on 5·6, 10·4, 14·9, 20, 24·5 and 29·4%CrFe and on 18·6%Cr9·9%NiFe alloys have been carried out. Irregular areas of attack were usually found instead of hemispherical pits. The current-time relationship of the form i = kt 3 was in general not obeyed. FeCr alloys which cooled slowly in vacuum showed two regions of passivity. This effect, probably caused by the presence of carbides on grain boundaries, was studied extensively on 20%CrFe alloys. A mechanism for the formation of irregular pits is proposed.
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