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Open AccessArticle

Microscopic Analysis of Steel Corrosion Products in Seawater and Sea-Sand Concrete

1
College of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, Jiangsu, China
2
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan
3
School of Materials Science and Engineering, Southeast University, Nanjing 211189, Jiangsu, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3330; https://doi.org/10.3390/ma12203330
Received: 20 September 2019 / Revised: 10 October 2019 / Accepted: 11 October 2019 / Published: 12 October 2019
In this paper, the types, formation time, structural morphology, and influence of steel corrosion products in seawater and sea-sand concrete were studied, and the intermediate and final products of steel corrosion under different conditions were determined. The corrosion products of steel in these concrete specimens under two curing methods were studied separately by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). Due to the presence of a large amount of chloride ions in the concrete, the rust layer on the surface of a steel bar contained many intermediates, such as lepidocrocite (γ–FeOOH) and aka-ganeite (β–FeOOH). Under wet/dry cycles, with the addition and loss of moisture in concrete, various corrosion products were also dynamically converted into each other. In the specimens immersed in seawater for a long time, the intermediates of corrosion were lepidocrocite (γ–FeOOH) and aka-ganeite (β–FeOOH), which were substituted for oxygen as the new depolarizers of cathode reduction reaction, and consumed themselves to ensure smooth corrosion.
Keywords: seawater and sea-sand concrete; steel corrosion products; XRD; SEM seawater and sea-sand concrete; steel corrosion products; XRD; SEM
MDPI and ACS Style

Wang, G.; Wu, Q.; Li, X.-Z.; Xu, J.; Xu, Y.; Shi, W.-H.; Wang, S.-L. Microscopic Analysis of Steel Corrosion Products in Seawater and Sea-Sand Concrete. Materials 2019, 12, 3330.

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