Journal
CEMENT & CONCRETE COMPOSITES
Volume 123, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.104178
Keywords
Corrosion-resistant steel; Carbonation; Passive film; Corrosion resistance; Concrete pore solutions
Funding
- National Natural Science Foundation of China [51678144]
- Fundamental Research Funds for the Central Universities [2242021R41142]
- Southeast University Zhongying Young Scholars Project
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Carbonation can modify the passive film of corrosion-resistant steel in alkaline concrete, with different effects based on the content of carbonate/bicarbonate ions. This study provides insights into the application of corrosion-resistant steels in carbonated concrete.
Prior to natural carbonation, a protective passive film could be formed naturally on reinforcing steel when exposure to alkaline concrete environment. To evaluate the modification of passive films caused by carbonation on a corrosion-resistant steel containing Cr and Mo in alkaline concrete pore solution, the passivation capability and passive film composition were investigated in moderate carbonation (pH = 11) and severe carbonation (pH = 9) conditions using various electrochemical measurements (OCP, LPR, EIS, M - S and CV) and X-ray photoelectron spectroscopy (XPS). The results revealed that carbonation with various contents of carbonate/ bicarbonate ions could exert different effects on naturally passivated corrosion-resistant steel by modification of the chemical composition of passive films, thus providing new insights into the field application of corrosionresistant steels in carbonated concrete.
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