This study simulates the behavior of 2205 duplex stainless steel (DSS) in an actual service environment under hydrogen charging/releasing cycles. Electrochemical and immersion experiments are conducted to compare the pitting susceptibility and corrosion behavior of 2205 DSS under single hydrogen charging and several hydrogen charging/releasing cycles. The results reveal that under single hydrogen charging, pits preferentially initiate and propagate within the austenite phase; this finding is consistent with the results of previous studies. However, under cyclic hydrogen charging/releasing cycles, pits initiate at the phase boundary and propagate along it. Moreover, a hydrogen microprint technique is used to characterize the hydrogen enrichment sites in 2205 DSS. The results demonstrate that pits preferentially initiate at the same hydrogen enrichment sites. The study creates a schematic of hydrogen redistribution and hypothesizes that under actual service conditions, the phase boundary, rather than the austenite phase, is the primary site for pitting corrosion because of its transformation into a hydrogen enrichment site from a hydrogen trap.
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1 April 2024
Research Article|
February 22 2024
Influence of the Interaction of Hydrogen with the Phase Boundary of Duplex Stainless Steel on Corrosion
Houwei Zhang;
Houwei Zhang
*State Key Laboratory of Nuclear Power Safety Technology and Equipment, University of Science and Technology Beijing, Beijing, 100083, China.
****These authors contributed equally to this work.
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Qing Zheng;
Qing Zheng
*State Key Laboratory of Nuclear Power Safety Technology and Equipment, University of Science and Technology Beijing, Beijing, 100083, China.
****These authors contributed equally to this work.
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Dengyun Wang;
Dengyun Wang
*State Key Laboratory of Nuclear Power Safety Technology and Equipment, University of Science and Technology Beijing, Beijing, 100083, China.
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Ming Liu;
Ming Liu
*State Key Laboratory of Nuclear Power Safety Technology and Equipment, University of Science and Technology Beijing, Beijing, 100083, China.
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Gang Li;
Gang Li
‡
**Nuclear Power Institute of China, Suzhou, 610041, China.
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Lining Xu;
Lining Xu
‡
***Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China.
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Lijie Qiao
Lijie Qiao
*State Key Laboratory of Nuclear Power Safety Technology and Equipment, University of Science and Technology Beijing, Beijing, 100083, China.
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CORROSION (2024) 80 (4): 417–429.
Citation
Houwei Zhang, Qing Zheng, Dengyun Wang, Ming Liu, Gang Li, Lining Xu, Lijie Qiao; Influence of the Interaction of Hydrogen with the Phase Boundary of Duplex Stainless Steel on Corrosion. CORROSION 1 April 2024; 80 (4): 417–429. doi: https://doi.org/10.5006/4519
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