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Comparative studies on passivation and corrosion behaviors of two types of steel bars in simulated concrete pore solution
Highlights S275 had a higher passivation rate at the first 1 h, afterwards, it became lower. The lower Fe2+ oxides of S275 in the passive film showed poor protective property. The higher donor density of S275 implied more point defects in the passive film. The chloride threshold value of B500 was 4 times higher than that of S275.
Abstract The corrosion behavior of two types of stirrups, a plain steel bar and a ribbed steel bar, were studied in this work. The results demonstrated that a better passive state was achieved on B500, which was due to a relatively higher concentration of Fe2+ oxides at the first 2 nm depths of the film, even though B500 film had relatively less FeOx contents, because Fe2+ oxides had a better protective property than Fe3+ oxides. Furthermore, the slightly lower donor density of B500 film in the M-S analysis results presented the much less point defect in the film, showing an increase in the anti-corrosion property of passive film. These contributed to a higher chloride threshold value of B500, 4 times higher than that of S275. Therefore, compared with S275, B500 stirrups could be more suitable for the application in the severe service environment.
Comparative studies on passivation and corrosion behaviors of two types of steel bars in simulated concrete pore solution
Highlights S275 had a higher passivation rate at the first 1 h, afterwards, it became lower. The lower Fe2+ oxides of S275 in the passive film showed poor protective property. The higher donor density of S275 implied more point defects in the passive film. The chloride threshold value of B500 was 4 times higher than that of S275.
Abstract The corrosion behavior of two types of stirrups, a plain steel bar and a ribbed steel bar, were studied in this work. The results demonstrated that a better passive state was achieved on B500, which was due to a relatively higher concentration of Fe2+ oxides at the first 2 nm depths of the film, even though B500 film had relatively less FeOx contents, because Fe2+ oxides had a better protective property than Fe3+ oxides. Furthermore, the slightly lower donor density of B500 film in the M-S analysis results presented the much less point defect in the film, showing an increase in the anti-corrosion property of passive film. These contributed to a higher chloride threshold value of B500, 4 times higher than that of S275. Therefore, compared with S275, B500 stirrups could be more suitable for the application in the severe service environment.
Comparative studies on passivation and corrosion behaviors of two types of steel bars in simulated concrete pore solution
Cai, Yamei (author) / Zheng, Haibing (author) / Hu, Xiang (author) / Lu, Jianxin (author) / Poon, Chi Sun (author) / Li, Weihua (author)
2020-09-04
Article (Journal)
Electronic Resource
English
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