Journal
CORROSION SCIENCE
Volume 165, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108393
Keywords
Steel reinforced concrete; XPS; EIS; AFIvi; Passive films
Funding
- National Key R & D Program of China [2017YFB0309904]
- National Natural Science Foundation of China [51572088, 51602050, 51561135012]
- Pearl River S& T Nova Program of Guangzhou [201806010188]
- State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology) [SYSJJ2017-05]
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Due to different ion types and concentration in pore solution, the passive film on the steel surface possesses different characteristics in alkali-activated fly ash (AAFA). In this study, the passive film formed in simulated AAFA pore solution was investigated by surface analysis and electrochemical measurements. The passive film possessed bilayer structure with FeOOH-rich outer layer and FeO-rich inner layer in simulated AAFA pore solution. Further, a firmly adsorbed zeolite-like layer (200 nm) formed on the steel surface. The formation of more protective passive film and adsorbed layer resulted in higher corrosion resistance of the reinforcement in simulated AAFS pore solution.
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