Effect of the direction of the inclusions on the tested surface on susceptibility to pitting corrosion in stainless steels
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A study was made of the induction time of pitting (ti) at constant potential in a stainless steel 316 L specimen in deareated NaCl solutions. The influence of the inclusion content in the steel on ti was examined, in particular the effect of the inclusions' orientation on the surface of the specimen tested. It was found that the induction time at constant potential and under similar experimental conditions depends on the inclusions' orientation on the test specimen surface; when the direction of the inclusions is transverse to the rolling direction, ti is shortened in comparison with the tested surface planes containing the rolling direction. The pitting initiation sites were the matrix-sulphide inclusions interphase. The microcavities associated with them could be preferential sites for pit nucleation.
KeywordsPolymer Stainless Steel Test Specimen Rolling Direction Surface Plane
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