Influence of Carbonization and Chloride Salt on Passivation of Steel Bars in Concrete Pore Solution

被引：0
|
作者：
Li X. [1 ]
Liu J. [1 ]
Yan J. [1 ]
Wang J. [1 ]
机构：
[1] Faculty of Civil Engineering and Environment, Ningbo University, Ningbo
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2020年 / 23卷 / 01期
关键词：
Carbonation; Chloride ion; Concrete pore solution; Corrosion product; Microstructure;
D O I：
10.3969/j.issn.1007-9629.2020.01.033
中图分类号：
学科分类号：
摘要：
The microstructures and composition of steel corrosion products in concrete pore solution under carbonation and chloride salt were studied by X-ray photoelectron spectroscopy(XPS). The corrosion mechanism of steel bars under the corrosion factors was elucidated. The results show that the passivation film and corrosion coexist in chloride-salt pore solution. The surface of corrosion is relatively dense and mainly consists of FeOOH and FeO. Yellow and black corrosions are on the surface of the steel immersed in the carbonized solution. The main components of corrosion products are FeOOH, Fe3O4 and Fe2O3. The surface of the steel bar has a large amount of tawny corrosion products in the mixed pore solution of carbonization and chloride. The surface of the corrosion products are stripped and the main components are FeOOH, Fe3O4 and FeCl3, where the content of FeOOH is as high as 60% or even higher. The XPS scanning peak value of iron is gradually increased from the chloride salt pore solution, carbonized solution to the mixed pore solution of carbonation and chloride. The iron oxide content is increased and corrosion of steel is obviously serious. © 2020, Editorial Department of Journal of Building Materials. All right reserved.
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页码：224 / 229
页数：5
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