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Unveiling nano-scaled chemical inhomogeneity impacts on corrosion of Ce-modified 2507 super-duplex stainless steels

Singh, Harishchandra ; Xiong, Yi ; Rani, Ekta ; Wang, Shubo ; Kharbach, Mourad ; Zhou, Tian ; Yao, Huai ; Niu, Yuran LU ; Zakharov, Alexei LU and King, Graham , et al. (2022) In npj Materials Degradation 6(1).
Abstract

The widely used stainless steels and their deformed variants are anticorrosive in ambient conditions due to passivation layers composed of chromium oxides. Conventionally, corrosion and erosion of the steels are attributed to the breakdown of such layers but seldomly to the origin that depends on surface heterogeneity at the microscopic level. In this work, the nanometer-scaled chemical heterogeneity at the surface unveiled via spectro-microscopy and chemometric analysis unexpectedly dominates the breakdown and corrosion behavior of the cold-rolled Ce-modified 2507 super-duplex stainless steels (SDSS) over its hot-deformed counterpart. Though relatively uniformly covered by a native Cr2O3 layer revealed by X-ray... (More)

The widely used stainless steels and their deformed variants are anticorrosive in ambient conditions due to passivation layers composed of chromium oxides. Conventionally, corrosion and erosion of the steels are attributed to the breakdown of such layers but seldomly to the origin that depends on surface heterogeneity at the microscopic level. In this work, the nanometer-scaled chemical heterogeneity at the surface unveiled via spectro-microscopy and chemometric analysis unexpectedly dominates the breakdown and corrosion behavior of the cold-rolled Ce-modified 2507 super-duplex stainless steels (SDSS) over its hot-deformed counterpart. Though relatively uniformly covered by a native Cr2O3 layer revealed by X-ray photoemission electron microscopy, the cold-rolled SDSS behaved poorly in passivity because of locally distributed Fe3+ rich nano-islands over the Fe/Cr oxide layer. This atomic-level knowledge provides a deep understanding of corrosion of stainless steel and is expected to benefit corrosion controls of similar high-alloyed metals.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
npj Materials Degradation
volume
6
issue
1
article number
54
publisher
Nature Publishing Group
external identifiers
  • scopus:85133245092
ISSN
2397-2106
DOI
10.1038/s41529-022-00263-z
language
English
LU publication?
yes
id
2328c02e-2d02-4d14-a9b5-6251a4d5e1b2
date added to LUP
2022-10-07 13:21:42
date last changed
2022-10-07 13:21:42
@article{2328c02e-2d02-4d14-a9b5-6251a4d5e1b2,
  abstract     = {{<p>The widely used stainless steels and their deformed variants are anticorrosive in ambient conditions due to passivation layers composed of chromium oxides. Conventionally, corrosion and erosion of the steels are attributed to the breakdown of such layers but seldomly to the origin that depends on surface heterogeneity at the microscopic level. In this work, the nanometer-scaled chemical heterogeneity at the surface unveiled via spectro-microscopy and chemometric analysis unexpectedly dominates the breakdown and corrosion behavior of the cold-rolled Ce-modified 2507 super-duplex stainless steels (SDSS) over its hot-deformed counterpart. Though relatively uniformly covered by a native Cr<sub>2</sub>O<sub>3</sub> layer revealed by X-ray photoemission electron microscopy, the cold-rolled SDSS behaved poorly in passivity because of locally distributed Fe<sup>3+</sup> rich nano-islands over the Fe/Cr oxide layer. This atomic-level knowledge provides a deep understanding of corrosion of stainless steel and is expected to benefit corrosion controls of similar high-alloyed metals.</p>}},
  author       = {{Singh, Harishchandra and Xiong, Yi and Rani, Ekta and Wang, Shubo and Kharbach, Mourad and Zhou, Tian and Yao, Huai and Niu, Yuran and Zakharov, Alexei and King, Graham and de Groot, Frank M.F. and Kömi, Jukka and Huttula, Marko and Cao, Wei}},
  issn         = {{2397-2106}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{npj Materials Degradation}},
  title        = {{Unveiling nano-scaled chemical inhomogeneity impacts on corrosion of Ce-modified 2507 super-duplex stainless steels}},
  url          = {{http://dx.doi.org/10.1038/s41529-022-00263-z}},
  doi          = {{10.1038/s41529-022-00263-z}},
  volume       = {{6}},
  year         = {{2022}},
}