Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution
Abstract This study comprehensively investigates the passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution by examining phase transformation thermodynamics, microstructural characteristics, and electronic properties, combined with passivation experiments. The results demon...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-025-15606-4 |
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| author | Zeyun Zeng Jingtian You Shangjun Gu Jie Wang Fulong Wei Xiang Xie Zhiying Li Hui Yang Changrong Li |
| author_facet | Zeyun Zeng Jingtian You Shangjun Gu Jie Wang Fulong Wei Xiang Xie Zhiying Li Hui Yang Changrong Li |
| author_sort | Zeyun Zeng |
| collection | DOAJ |
| description | Abstract This study comprehensively investigates the passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution by examining phase transformation thermodynamics, microstructural characteristics, and electronic properties, combined with passivation experiments. The results demonstrated that the microcell models exhibited three distinct passivation behaviors in the initial stage of passivation. Firstly, the certain inclusions/second-phase precipitates with smallest work functions underwent the preferential dissolution, exhibiting the following pitting susceptibility tendency: TiVN2 > Ca8MgAl6Si5O28 > NbVCN > MnS > TiN. Secondly, SiO2, CaAl2SiO6 and CaMgSiO4 with higher work function served as cathodes, while the surrounding matrix functioned as anodes and underwent the rapid dissolution. Subsequently, the surface of rebar formed the polygonal passivation products, and gradually overlapping and covering the inclusions. Finally, the lamellar cementite, exhibiting the smallest work function, underwent the anodic dissolution. These findings indicated that the full passivation on the surface of rebar was developed through matrix dissolution induced by inclusions/second-phase precipitates, ultimately resulting in the nano-particle products aggregated into a continuous passivation film. |
| format | Article |
| id | doaj-art-5f5830cd4aca42e5878b3d4acb7265a4 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-5f5830cd4aca42e5878b3d4acb7265a42025-08-20T04:03:06ZengNature PortfolioScientific Reports2045-23222025-08-0115111710.1038/s41598-025-15606-4Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solutionZeyun Zeng0Jingtian You1Shangjun Gu2Jie Wang3Fulong Wei4Xiang Xie5Zhiying Li6Hui Yang7Changrong Li8College of Materials and Metallurgy, Guizhou UniversityCollege of Metallurgy and Energy, North China University of Science and TechnologyShougang Shuicheng Iron and Steel (Group) Co., LtdShougang Shuicheng Iron and Steel (Group) Co., LtdShougang Shuicheng Iron and Steel (Group) Co., LtdShougang Shuicheng Iron and Steel (Group) Co., LtdCollege of Materials and Metallurgy, Guizhou UniversityCollege of Materials and Metallurgy, Guizhou UniversityCollege of Materials and Metallurgy, Guizhou UniversityAbstract This study comprehensively investigates the passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution by examining phase transformation thermodynamics, microstructural characteristics, and electronic properties, combined with passivation experiments. The results demonstrated that the microcell models exhibited three distinct passivation behaviors in the initial stage of passivation. Firstly, the certain inclusions/second-phase precipitates with smallest work functions underwent the preferential dissolution, exhibiting the following pitting susceptibility tendency: TiVN2 > Ca8MgAl6Si5O28 > NbVCN > MnS > TiN. Secondly, SiO2, CaAl2SiO6 and CaMgSiO4 with higher work function served as cathodes, while the surrounding matrix functioned as anodes and underwent the rapid dissolution. Subsequently, the surface of rebar formed the polygonal passivation products, and gradually overlapping and covering the inclusions. Finally, the lamellar cementite, exhibiting the smallest work function, underwent the anodic dissolution. These findings indicated that the full passivation on the surface of rebar was developed through matrix dissolution induced by inclusions/second-phase precipitates, ultimately resulting in the nano-particle products aggregated into a continuous passivation film.https://doi.org/10.1038/s41598-025-15606-4 |
| spellingShingle | Zeyun Zeng Jingtian You Shangjun Gu Jie Wang Fulong Wei Xiang Xie Zhiying Li Hui Yang Changrong Li Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution Scientific Reports |
| title | Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution |
| title_full | Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution |
| title_fullStr | Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution |
| title_full_unstemmed | Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution |
| title_short | Study on passivation mechanism of HRB500E rebar in highly alkaline concrete pore solution |
| title_sort | study on passivation mechanism of hrb500e rebar in highly alkaline concrete pore solution |
| url | https://doi.org/10.1038/s41598-025-15606-4 |
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