Characterization of the passive film formed on the reinforcement surface in alkali activated fly ash: surface analysis and electrochemical evaluation

Chen, Rui and Hu, Jie and Ma, Yuwei and Guo, Wenhao and Huang, Haoliang and Wei, Jiangxiong and Yin, Suhong and Yu, Qijun (2020) Characterization of the passive film formed on the reinforcement surface in alkali activated fly ash: surface analysis and electrochemical evaluation. Corrosion Science, 165:108393. pp. 1-16. ISSN 0010-938X


Abstract

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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 20 Feb 2020 00:20
Last Modified: 02 Jun 2021 04:09
Uncontrolled Keywords: steel reinforced concrete, passive films, XPS, EIS, AFM
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
Identification Number or DOI: https://doi.org/10.1016/j.corsci.2019.108393
URI: http://eprints.usq.edu.au/id/eprint/37889

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