Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses
(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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- author
- organization
- publishing date
- 2019-12-01
- 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
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- 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}}, }