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Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses

Långberg, Marie ; Örnek, Cem ; Evertsson, Jonas LU ; Harlow, Gary S. LU ; Linpé, Weronica LU ; Rullik, Lisa LU ; Carlà, Francesco ; Felici, Roberto ; Bettini, Eleonora and Kivisäkk, Ulf , et al. (2019) In npj Materials Degradation 3(1).
Abstract
Passivity determines corrosion resistance and stability of highly-alloyed stainless steels, and passivity breakdown is commonly believed to occur at a fixed potential due to formation and dissolution of Cr(VI) species. In this work, the study of a 25Cr–7Ni super duplex stainless steel in 1 M NaCl solution revealed that the passivity breakdown is a continuous degradation progress of the passive film over a potential range, associated with enhanced Fe dissolution before rapid Cr dissolution and removal of the oxide. The breakdown involves structural and compositional changes of the passive film and the underlying alloy surface layer, as well as selective metal dissolution depending on the anodic potential. The onset of passivity breakdown... (More)
Passivity determines corrosion resistance and stability of highly-alloyed stainless steels, and passivity breakdown is commonly believed to occur at a fixed potential due to formation and dissolution of Cr(VI) species. In this work, the study of a 25Cr–7Ni super duplex stainless steel in 1 M NaCl solution revealed that the passivity breakdown is a continuous degradation progress of the passive film over a potential range, associated with enhanced Fe dissolution before rapid Cr dissolution and removal of the oxide. The breakdown involves structural and compositional changes of the passive film and the underlying alloy surface layer, as well as selective metal dissolution depending on the anodic potential. The onset of passivity breakdown occurred at 1000 mV/Ag/AgCl, and Fe dissolved more on the ferrite than the austenite phase. With increasing potential, the passive film became thicker but less dense, while the underlying alloy surface layer became denser indicating Ni and Mo enrichment. Rapid Cr dissolution occurred at ≥1300 mV/Ag/AgCl. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
npj Materials Degradation
volume
3
issue
1
publisher
Nature Publishing Group
external identifiers
  • scopus:85070931292
ISSN
2397-2106
DOI
10.1038/s41529-019-0084-3
language
English
LU publication?
yes
id
99f7726e-d5ef-4d45-bf4b-c510b14404fa
alternative location
http://www.nature.com/articles/s41529-019-0084-3
date added to LUP
2019-06-02 21:11:25
date last changed
2023-11-19 00:42:20
@article{99f7726e-d5ef-4d45-bf4b-c510b14404fa,
  abstract     = {{Passivity determines corrosion resistance and stability of highly-alloyed stainless steels, and passivity breakdown is commonly believed to occur at a fixed potential due to formation and dissolution of Cr(VI) species. In this work, the study of a 25Cr–7Ni super duplex stainless steel in 1 M NaCl solution revealed that the passivity breakdown is a continuous degradation progress of the passive film over a potential range, associated with enhanced Fe dissolution before rapid Cr dissolution and removal of the oxide. The breakdown involves structural and compositional changes of the passive film and the underlying alloy surface layer, as well as selective metal dissolution depending on the anodic potential. The onset of passivity breakdown occurred at 1000 mV/Ag/AgCl, and Fe dissolved more on the ferrite than the austenite phase. With increasing potential, the passive film became thicker but less dense, while the underlying alloy surface layer became denser indicating Ni and Mo enrichment. Rapid Cr dissolution occurred at ≥1300 mV/Ag/AgCl.}},
  author       = {{Långberg, Marie and Örnek, Cem and Evertsson, Jonas and Harlow, Gary S. and Linpé, Weronica and Rullik, Lisa and Carlà, Francesco and Felici, Roberto and Bettini, Eleonora and Kivisäkk, Ulf and Lundgren, Edvin and Pan, Jinshan}},
  issn         = {{2397-2106}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{npj Materials Degradation}},
  title        = {{Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses}},
  url          = {{http://dx.doi.org/10.1038/s41529-019-0084-3}},
  doi          = {{10.1038/s41529-019-0084-3}},
  volume       = {{3}},
  year         = {{2019}},
}