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Corrosion Behavior of Damaged Epoxy Coated Steel Bars Under the Coupling Effect of Chloride Ion and Carbonization
Wei Jie1; Wei Yinghua2; Li Jing2; Zhao Hongtao2; Lv Chenxi2; Dong Junhua1; Ke Wei3; He Xiaoyan3
Corresponding AuthorDong Junhua(jhdong@imr.ac.cn)
2020-06-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:6Pages:885-897
AbstractIt is unavoidable for coated steel bars to be scratched during transportation and construction, which will lead to the damage of coating and exposure of steel matrix. Consequently, the corrosion resistance of coated steel bars after damage will directly affect the durability of structures. The corrosion evolution behavior of damaged epoxy coated steel bars under the coupling action of chloride ion and carbonization was studied by comparing with bare steel bars and perfectly coated steel bars. On the basis of characterizing the composition and structural characteristics of epoxy coating, the corrosion morphology and product composition at the damage site of the coating were analyzed by CLSM and Raman spectroscopy, and the corrosion process was monitored by corrosion potential and electrochemical impedance spectroscopy to reveal the dynamic of corrosion evolution. The results show that the epoxy coating without damage has a good protective effect on steel matrix, and no corrosion occurs during long-term immersion in all six solutions including the chloride ions and carbonization corrosive environments. The corrosion activation or passivation behavior of damaged coated steel bars is consistent with that of uncoated bare bars, which is obviously affected by chloride ion and carbonization. Passivation occurs in the system without Cl- and with pH of 12.6 or 9.8. Activation dissolution occurs in the chloride-free system with pH of 9.2, and in the system of different pH values with 0.6 mol/L NaCl. In the active systems, the corrosion rate increases with time. In the chloride-free system, the corrosion products after long-term corrosion are mainly alpha-FeOOH, while in the chloride-containing system with different pH, the corrosion products contain not only alpha-FeOOH, but also beta-FeOOH and a small amount of Fe3O4. Under the coupling action of chloride ion and carbonization, the corrosion of damaged coated steel bars occurs only in the damaged site, and the corrosion extends towards to the depth of the matrix, which will not cause the peeling of coatings in other sites.
Keywordepoxy coated steel bar corrosion evolution chloride ion carbonization
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Shenyang Key Research and Development and Technology Transfer Program
DOI10.11900/0412.1961.2019.00302
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51501201] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA13040501] ; Shenyang Key Research and Development and Technology Transfer Program
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000546975500009
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139668
Collection中国科学院金属研究所
Corresponding AuthorDong Junhua
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Res & Dev Ctr Adv Mat, Shenyang 110016, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Environm Corros Ctr, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wei Jie,Wei Yinghua,Li Jing,et al. Corrosion Behavior of Damaged Epoxy Coated Steel Bars Under the Coupling Effect of Chloride Ion and Carbonization[J]. ACTA METALLURGICA SINICA,2020,56(6):885-897.
APA Wei Jie.,Wei Yinghua.,Li Jing.,Zhao Hongtao.,Lv Chenxi.,...&He Xiaoyan.(2020).Corrosion Behavior of Damaged Epoxy Coated Steel Bars Under the Coupling Effect of Chloride Ion and Carbonization.ACTA METALLURGICA SINICA,56(6),885-897.
MLA Wei Jie,et al."Corrosion Behavior of Damaged Epoxy Coated Steel Bars Under the Coupling Effect of Chloride Ion and Carbonization".ACTA METALLURGICA SINICA 56.6(2020):885-897.
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