In situ SR-XRD analysis of corrosion product formation during ‘pseudo-passivation’ of carbon steel in CO2-containing aqueous environments

In situ Synchrotron Radiation X-ray Diffraction (SR-XRD) is employed to follow the evolution of corrosion products on X65 carbon steel in a CO 2-containing aqueous environment (80 • C, pH 6.3-7.3). A custom-designed flow cell is used to follow the real-time concomitant changes in electrochemical beh...

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Bibliographic Details
Published inCorrosion science Vol. 225; p. 111598
Main Authors Owen, Joshua, Burkle, Danny, Joshi, Gaurav R., Basilico, Edoardo, Kittel, Jean, Ropital, Francois, Marcelin, Sabrina, Kleppe, Annette, Woollam, Richard C., Barker, Richard
Format Journal Article
LanguageEnglish
Published Elsevier 01.12.2023
Subjects
Chemical Sciences
Material chemistry
Carbon steel
Pseudo-passivation
Potentiodynamic polarisation
CO2 corrosion
Iron carbonate
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Summary:In situ Synchrotron Radiation X-ray Diffraction (SR-XRD) is employed to follow the evolution of corrosion products on X65 carbon steel in a CO 2-containing aqueous environment (80 • C, pH 6.3-7.3). A custom-designed flow cell is used to follow the real-time concomitant changes in electrochemical behaviour and corrosion product growth during stages of both natural and potentiodynamically driven 'pseudo-passivation'. We show that no detectable crystalline magnetite (Fe 3 O 4) phase forms during 'pseudo-passivation' across all conditions studied. Furthermore, the results suggest the significant ennoblement observed during 'pseudo-passivation' in these experiments can be strongly related to the accumulation of iron carbonate (FeCO 3) on the steel surface.
ISSN:0010-938X
DOI:10.1016/j.corsci.2023.111598