Macrocell Effect on Chloride Threshold Value and Corrosion Rate of Steel Bar in Simulated Concrete Pore Solution
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 12
Abstract
In this work, the influence of the area ratio of the low corrosion probability area (prone to becoming cathode) and high corrosion probability area (prone to becoming anode) on the initiation of macrocell corrosion of a steel bar in a simulated pore solution was investigated, along with the depassivation mechanism under the macrocell effect. Meanwhile, the set cathode-to-anode area ratio () and the actual cathode-to-anode (pitted) area ratio () after corrosion initiation were compared. The results reveal that the increase in not only increases the corrosion current density but also promotes corrosion initiation drastically. A pronounced positive shift was observed at high in the initiation phase due to intensified chloride adsorption and the double-layer effect on the passive film of the anodic steel bar. The chloride threshold value (CTV) could be reduced to 42% of the original time in the simulated concrete pore solution, and the pit depth was increased by up to 124% due to the macrocell effect. In addition, the actual corrosion area () is much smaller than the set anode area () because the corrosion area created by chloride ions is tiny, resulting in being higher than .
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This project was supported by the Guangdong Basic and Applied Basic Research Fund Project (2021A1515110594), the Natural Science Foundation of China (52271355), the Guangdong International Science and Technology Cooperation Project (2019A050510020), the Henan Science and Technology Project (232102230124), and the Research Start-Up Funding Project of the Henan Academy of Sciences (231818019).
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Journal of Materials in Civil Engineering
Volume 35 • Issue 12 • December 2023
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© 2023 American Society of Civil Engineers.
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Received: Sep 4, 2022
Accepted: Apr 14, 2023
Published online: Sep 22, 2023
Published in print: Dec 1, 2023
Discussion open until: Feb 22, 2024
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