Influence of Microdefect Size on Corrosion Behavior of Epoxy-Coated Rebar for Application in Seawater-Mixed Concrete

doi:10.3390/coatings11040439

IMR OpenIR

	Influence of Microdefect Size on Corrosion Behavior of Epoxy-Coated Rebar for Application in Seawater-Mixed Concrete
	Wan, Li 1,2; Wei, Yinghua 1; Zhao, Hongtao 1; Cao, Haijiao 1; Li, Jing 1
通讯作者	Wei, Yinghua(yhwei@imr.ac.cn)
	2021-04-01
发表期刊	COATINGS
卷号	11 期号:4 页码:25
摘要	Corrosion behavior of epoxy-coated rebar with different size of microdefects in uncarbonated/carbonated simulated pore solution (U/CSPS) of seawater concrete was investigated. Specimens in both solutions underwent two stages of corrosion, according to the electrochemical impedance spectroscopy (EIS) response. The initial stage was the extension of corrosion. The second stage was dominated by the diffusion process, due to the corrosion products blocking the defects and hindering the transportation of the reaction matter. Local electrochemical impedance spectroscopy (LEIS), scanning vibrating electrode technique (SVET) measurements and the observation of corrosion products indicated that 50 mu m might be the threshold, because the corrosion of specimens with defects bigger than 50 mu m in diameter was significantly more severe. Crevice corrosion was identified to occur in the experiments. The corrosion products of specimens in USPS and CSPS were mainly Fe3O4 and FeOOH, respectively. alpha-FeOOH and beta-FeOOH exhibited an anion ion-selective property in the corrosion process, which induced crevice corrosion in CSPS. In particular, it is contended herein that Fe3O4 has the cation ion-selective property to protect the substrate in USPS.
关键词	corrosion epoxy-coated rebar seawater-mixed concrete microdefect LEIS SVET
资助者	Strategic Precursor Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China
DOI	10.3390/coatings11040439
收录类别	SCI
语种	英语
资助项目	Strategic Precursor Research Program of the Chinese Academy of Sciences[XDA13040501] ; National Natural Science Foundation of China[52071320]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Materials Science, Coatings & Films ; Physics, Applied
WOS记录号	WOS:000642932500001
出版者	MDPI
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/162440
专题	中国科学院金属研究所
通讯作者	Wei, Yinghua
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wan, Li,Wei, Yinghua,Zhao, Hongtao,et al. Influence of Microdefect Size on Corrosion Behavior of Epoxy-Coated Rebar for Application in Seawater-Mixed Concrete[J]. COATINGS,2021,11(4):25.
APA	Wan, Li,Wei, Yinghua,Zhao, Hongtao,Cao, Haijiao,&Li, Jing.(2021).Influence of Microdefect Size on Corrosion Behavior of Epoxy-Coated Rebar for Application in Seawater-Mixed Concrete.COATINGS,11(4),25.
MLA	Wan, Li,et al."Influence of Microdefect Size on Corrosion Behavior of Epoxy-Coated Rebar for Application in Seawater-Mixed Concrete".COATINGS 11.4(2021):25.