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; Zakharov, Alexei; King, Graham; de Groot, Frank M.F.; Kömi, Jukka; Huttula, Marko; Cao, Wei
(2022) npj Materials Degradation, volume 6, issue 1, pp. 1 - 10
(Article)
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
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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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Keywords: Ceramics and Composites, Chemistry (miscellaneous), Materials Science (miscellaneous), Materials Chemistry
ISSN: 2397-2106
Publisher: Springer Nature
Note: Funding Information: The Academy of Finland (grant #311934) and National Natural Science Foundation of China (grant numbers U1804146 and 52111530068) are acknowledged for the financial supports. We thank the crew of the MAX IV laboratory for their support during the beamtime operation. Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council (NSERC), the National Research Council (NRC), the Canadian Institutes of Health Research (CIHR), the Government of Saskatchewan, and the University of Saskatchewan. The Center of Microscopy and Nanotechnology of the University of Oulu is also acknowledged for in house XRD characterizations. Funding Information: The Academy of Finland (grant #311934) and National Natural Science Foundation of China (grant numbers U1804146 and 52111530068) are acknowledged for the financial supports. We thank the crew of the MAX IV laboratory for their support during the beamtime operation. Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council (NSERC), the National Research Council (NRC), the Canadian Institutes of Health Research (CIHR), the Government of Saskatchewan, and the University of Saskatchewan. The Center of Microscopy and Nanotechnology of the University of Oulu is also acknowledged for in house XRD characterizations. Publisher Copyright: © 2022, The Author(s).
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