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Passivity and resistance to localised corrosion of duplex stainless steels after ageing in solution containing chloride ions: local study using SIMS, high-resolution Auger and microcapillary techniques

Published online by Cambridge University Press:  01 September 2011

H. Zhang ,
V. Vignal ,
O. Heintz  and
J. Peultier
H. Zhang
Affiliation:
ICB, UMR 5209 CNRS–Univ. de Bourgogne, BP 47870, 21078 Dijon Cedex, France. e-mail: vincent.vignal@u-bourgogne.fr
V. Vignal
Affiliation:
ICB, UMR 5209 CNRS–Univ. de Bourgogne, BP 47870, 21078 Dijon Cedex, France. e-mail: vincent.vignal@u-bourgogne.fr
O. Heintz
Affiliation:
ICB, UMR 5209 CNRS–Univ. de Bourgogne, BP 47870, 21078 Dijon Cedex, France. e-mail: vincent.vignal@u-bourgogne.fr
J. Peultier
Affiliation:
ArcelorMittal, Global R&D Le Creusot, Industeel, BP 19, 71201 Le Creusot Cedex, France
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Abstract

The influence of long-term ageing in NaCl on the passivity and electrochemical behaviour of UNS S32304 was studied. The passive film thickness, the Cr/Fe ratio and the chloride content were significantly increased after ageing. The chloride distribution depends on residual stresses, the sample microstructure and surface preparation. Local electrochemical measurements revealed that pitting potentials are between 250 and 550 mV vs. SCE after electropolishing. The higher the chloride content, the lower the local pitting potential. It was also shown that the presence of chloride was balanced by the enrichment in chromium after ageing. Then no pitting potential could be measured.

Keywords

Corrosionduplex stainless steelresidual stresspassive filmCorrosionacier inoxydable duplexcontrainte résiduellefilm passif
Type
Research Article
Information
Metallurgical Research & Technology , Volume 108 , Issue 1: Numéro thématique sur les aciers inoxydables , 2011 , pp. 9 - 15
Copyright
© EDP Sciences, 2011

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