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Corrosion Behavior of Epoxy-Coated Rebar with Pinhole Defect in Seawater Concrete
Mao, Yao-Zong1,2; Wei, Ying-Hua2; Zhao, Hong-Tao2; Lv, Chen-Xi2; Cao, Hai-Jiao2; Li, Jing2
Corresponding AuthorWei, Ying-Hua(yhwei@imr.ac.cn)
2018-11-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume31Issue:11Pages:1171-1182
AbstractExperiments were carried out to investigate the corrosion behavior of epoxy-coated rebar (ECR) with pinhole defect (diameter in hundreds of microns) immersed in the uncarbonated/carbonated simulated pore solution (SPS) of seawater concrete. Corrosion behavior was analyzed by electrochemical impedance spectroscopy. The composition and morphology of corrosion products were characterized by X-ray diffraction, energy-dispersive spectrometry and scanning electron microscopy. Meanwhile, oxide film produced by preheating before spray coating was investigated by X-ray photoelectron spectroscopy and Mott-Schottky technology. Results indicated that corrosion behavior of ECR with pinhole defect exhibited three stages when immersed in the uncarbonated/carbonated SPS. In the initial stage, steel in defect was passivated when exposed in the uncarbonated SPS and corroded when exposed in the carbonated SPS, due to competitive adsorption between chloride and hydroxyl ions. In the second stage, the oxide film under coating reconstituted (the thickness and defects density decreasing) in the uncarbonated SPS, which was caused by the synergy between high hydroxide and chloride activity, while in the carbonated SPS, crevice corrosion happened under the coating around pinhole, because of the different oxygen concentrations cell at the coating/steel interface. In the third stage, localized corrosion occurred under the coating around the pinhole in the uncarbonated SPS, which was probably induced by ion diffusion at the nano-scale coating/steel interface. The corrosion products adjacent to the defects were re-oxidized from FeCl(2)4H(2)O and Fe-2(OH)(3)Cl to Fe2O3H2O, and the corrosion area was expanded outward in the carbonated SPS.
KeywordCorrosion Epoxy-coated rebar (ECR) Seawater concrete Pinhole defects
Funding OrganizationStrategic Precursor Research Program of the Chinese Academy of Sciences
DOI10.1007/s40195-018-0755-z
Indexed BySCI
Language英语
Funding ProjectStrategic Precursor Research Program of the Chinese Academy of Sciences[XDA13040500]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000444031000005
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/129423
Collection中国科学院金属研究所
Corresponding AuthorWei, Ying-Hua
Affiliation1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Mao, Yao-Zong,Wei, Ying-Hua,Zhao, Hong-Tao,et al. Corrosion Behavior of Epoxy-Coated Rebar with Pinhole Defect in Seawater Concrete[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2018,31(11):1171-1182.
APA Mao, Yao-Zong,Wei, Ying-Hua,Zhao, Hong-Tao,Lv, Chen-Xi,Cao, Hai-Jiao,&Li, Jing.(2018).Corrosion Behavior of Epoxy-Coated Rebar with Pinhole Defect in Seawater Concrete.ACTA METALLURGICA SINICA-ENGLISH LETTERS,31(11),1171-1182.
MLA Mao, Yao-Zong,et al."Corrosion Behavior of Epoxy-Coated Rebar with Pinhole Defect in Seawater Concrete".ACTA METALLURGICA SINICA-ENGLISH LETTERS 31.11(2018):1171-1182.
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