In-situ synchrotron GIXRD study of passive film evolution on duplex stainless steel in corrosive environment. (15th August 2018)

• Record Type: Journal Article
• Authors: Örnek, Cem; Långberg, Marie; Evertsson, Jonas; Harlow, Gary; Linpé, Weronica; Rullik, Lisa; Carlà, Francesco; Felici, Roberto; Bettini, Eleonora; Kivisäkk, Ulf; Lundgren, Edvin; Pan, Jinshan
• Is Part Of: Corrosion science. Volume 141(2018)
• Page Start: 18
• Page End: 21
• Publication Date: 2018-08-15
• Subjects: Passivity -- Oxide film -- Duplex stainless steel -- Grazing-incidence X-ray diffraction (GIXRD) -- Selective dissolution -- De-alloying; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.06.040
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: 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.