Crevice corrosion of steel rebar in chloride-contaminated concrete

•Crevice corrosion occurs once chloride concentration is higher than 0.25 M.•Crevice corrosion occurs at temperatures higher than 35 °C.•The autocatalytic crevice corrosion damage always deteriorates with time.•The galvanic effect accelerates the anodic dissolution inside the crevice. In this paper,...

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Bibliographic Details
Published in:Construction & building materials 2021-08, Vol.296, p.123587, Article 123587
Main Authors: Yan, Lei, Song, Guang-Ling, Wang, Ziming, Zheng, Dajiang
Format: Article
Language:English
Subjects:
Concrete
Crevice corrosion
Simulated concrete pore solution
Steel
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Summary:•Crevice corrosion occurs once chloride concentration is higher than 0.25 M.•Crevice corrosion occurs at temperatures higher than 35 °C.•The autocatalytic crevice corrosion damage always deteriorates with time.•The galvanic effect accelerates the anodic dissolution inside the crevice. In this paper, crevice corrosion was proposed as one of the important mechanisms responsible for the damage of steel rebar in concrete, which was experimentally verified in simulated concrete pore solution (SCPS) and concrete blocks. The effects of chloride concentration and temperature on the crevice corrosion were comparatively investigated by means of potentiodynamic polarization, immersion, electrochemical impedance spectroscopy (EIS) and galvanic current measurements. The crevice corrosion products in chloride-contaminated SCPS were examined by X-ray photoelectron spectroscopy (XPS). The results indicated that chloride contamination and temperature elevation could significantly accelerate the crevice corrosion.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2021.123587