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

Article

Chen, Rui, Hu, Jie, Ma, Yuwei, Guo, Wenhao, Huang, Haoliang, Wei, Jiangxiong, 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, pp. 1-16. https://doi.org/10.1016/j.corsci.2019.108393
Article Title

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

ERA Journal ID4761
Article CategoryArticle
AuthorsChen, Rui (Author), Hu, Jie (Author), Ma, Yuwei (Author), Guo, Wenhao (Author), Huang, Haoliang (Author), Wei, Jiangxiong (Author), Yin, Suhong (Author) and Yu, Qijun (Author)
Journal TitleCorrosion Science
Journal Citation165, pp. 1-16
Article Number108393
Number of Pages16
Year2020
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0010-938X
1879-0496
Digital Object Identifier (DOI)https://doi.org/10.1016/j.corsci.2019.108393
Web Address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0010938X19301246
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.

Keywordssteel reinforced concrete, passive films, XPS, EIS, AFM
ANZSRC Field of Research 2020400505. Construction materials
Byline AffiliationsSouth China University of Technology, China
Centre for Future Materials
Institution of OriginUniversity of Southern Queensland
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