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Corrosion current distribution of macrocell and microcell of steel bar in concrete exposed to chloride environments
Highlights The corrosion characteristics of rebar in concrete are decided by the corrosion current distribution. Both macrocell and microcell corrosion mechanisms could play significant roles. I g not only affects the distribution of the corrosion current, but expedites the corrosion of the entire steel. One part of I g contributes to the increase in the corrosion current. The total corrosion current equals to the anodic dissolution current in the active steel.
Abstract The corrosion morphology of rebar in concrete was observed and the corrosion current distribution along the circumference of the steel bar was analyzed theoretically and verified by experiments. The results show that the macrocell corrosion must co-exist with microcell corrosion of reinforcements in concrete. The microcell corrosion takes place in active zone of the rebar surface facing the concrete cover. The macrocell corrosion current I g between the internal and external surfaces not only further expedites the corrosion process on the surface of the steel bar facing the concrete cover, but also forms cathode protect from the corrosion of the side of steel bar opposite to the concrete cover. Both macrocell and microcell corrosion mechanisms could play significant roles, and the total corrosion could be underestimated if either of them is overlooked. The total corrosion current equals the sum of microcell corrosion current I corr2 of active steel and anodic dissolution current (ΔI corrA) caused by I g.
Corrosion current distribution of macrocell and microcell of steel bar in concrete exposed to chloride environments
Highlights The corrosion characteristics of rebar in concrete are decided by the corrosion current distribution. Both macrocell and microcell corrosion mechanisms could play significant roles. I g not only affects the distribution of the corrosion current, but expedites the corrosion of the entire steel. One part of I g contributes to the increase in the corrosion current. The total corrosion current equals to the anodic dissolution current in the active steel.
Abstract The corrosion morphology of rebar in concrete was observed and the corrosion current distribution along the circumference of the steel bar was analyzed theoretically and verified by experiments. The results show that the macrocell corrosion must co-exist with microcell corrosion of reinforcements in concrete. The microcell corrosion takes place in active zone of the rebar surface facing the concrete cover. The macrocell corrosion current I g between the internal and external surfaces not only further expedites the corrosion process on the surface of the steel bar facing the concrete cover, but also forms cathode protect from the corrosion of the side of steel bar opposite to the concrete cover. Both macrocell and microcell corrosion mechanisms could play significant roles, and the total corrosion could be underestimated if either of them is overlooked. The total corrosion current equals the sum of microcell corrosion current I corr2 of active steel and anodic dissolution current (ΔI corrA) caused by I g.
Corrosion current distribution of macrocell and microcell of steel bar in concrete exposed to chloride environments
Ji, Yong-sheng (author) / Zhao, Wen (author) / Zhou, Min (author) / Ma, Hui-rong (author) / Zeng, Ping (author)
Construction and Building Materials ; 47 ; 104-110
2013-05-04
7 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2013
Macrocell and Microcell Corrosion of Embedded Steels in Concrete with Chloride Ions
| British Library Conference Proceedings | 1996