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In-situ synchrotron GIXRD study of passive film evolution on duplex stainless steel in corrosive environment
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
Lund Univ, Div Synchrotron Radiat Res, SE-22100 Lund, Sweden..
Lund Univ, Div Synchrotron Radiat Res, SE-22100 Lund, Sweden..
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2018 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 141, p. 18-21Article in journal (Refereed) Published
Abstract [en]

This paper presents new findings about the passive film formed on super duplex stainless steel in ambient air and corrosive environments, studied by synchrotron grazing-incidence X-ray diffraction (GIXRD). The passive film, formed in air, was seen to be a nano-crystalline mixed-oxide. Electrochemical polarisation to the passive region in aqueous 1 M NaCl at room temperature resulted in an increase of the passive film thickness, preferential dissolution of Fe, and partial loss of crystallinity. After termination of polarization to the transpassive regime, reformation of the mixed-oxides was observed, showing a thicker, semi-crystalline, and more defective nature (more vacancies) with further new oxides/hydroxides.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 141, p. 18-21
Keywords [en]
Passivity, Oxide film, Duplex stainless steel, Grazing-incidence X-ray diffraction (GIXRD), Selective dissolution, De-alloying
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:kth:diva-234174DOI: 10.1016/j.corsci.2018.06.040ISI: 000441682000003Scopus ID: 2-s2.0-85049421217OAI: oai:DiVA.org:kth-234174DiVA, id: diva2:1254417
Note

QC 20181009

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-10-30Bibliographically approved

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