Comparative studies on passivation and corrosion behaviors of two types of steel bars in simulated concrete pore solution

Yamei Cai, Haibing Zheng, Xiang Hu, Jianxin Lu, Chi Sun Poon, Weihua Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Article number120971
JournalConstruction and Building Materials
Volume266
DOIs
Publication statusPublished - 10 Jan 2021

Keywords

  • Chloride threshold value
  • Corrosion
  • Passive film
  • Steel bars
  • Stirrups

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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