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Rebar corrosion behavior of coral aggregate seawater concrete by electrochemical techniques

Zhangyu Wu (Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Hongfa Yu (Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Haiyan Ma (Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Bo Da (Nanjing University of Aeronautics and Astronautics, Nanjing, China)
Yongshan Tan (Nanjing University of Aeronautics and Astronautics, Nanjing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 6 January 2020

Abstract

Purpose

Coral aggregate seawater concrete (CASC) is a new type of lightweight aggregate concrete that is becoming widely used in reef engineering. To investigate the corrosion behavior of different kinds of rebar in CASC exposed to simulated seawater for 0-270 d, the electrochemical techniques, including linear polarization resistance (LPR) technique and the electrochemical impedance spectroscopy (EIS), were used in the present work.

Design/methodology/approach

The electrochemical techniques, including LPR technique and the EIS, were used in the present work.

Findings

Based on the time-varying law of linear polarization curves, self-corrosion potential (Ecorr), polarization resistance (Rp), corrosion current density (Icorr), corrosion rate (i), and the characteristics of EIS diagrams for different types of rebar in CASC, it can be found that the anti-corrosion property of them can be ranked as epoxy resin coated steel > 2205 duplex stainless steel (2205S) > 316 L stainless steel (316 L) > organic coated steel > ordinary steel. Additionally, the linear regression equation between Rp and charge transfer resistance (Rct) was established. Finally, the EIS corrosion standard of rebar was established from the LPR corrosion standard, which provides a direct standard for the EIS technique to determine the condition of rebar in CASC.

Originality/value

The linear regression equation between polarization resistance and charge transfer resistance was established. And the EIS corrosion standard of rebar was established from the LPR corrosion standard, which provides a direct standard for the EIS technique to determine the condition of rebar in CASC.

Keywords

Acknowledgements

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China under Grant No. 51678304 and No. 51508272, the China Postdoctoral Science Foundation under Grant No. 2018M630558, and the Natural Science Foundation of Jiangsu Province under Grant No. SBK2018041341.

Citation

Wu, Z., Yu, H., Ma, H., Da, B. and Tan, Y. (2020), "Rebar corrosion behavior of coral aggregate seawater concrete by electrochemical techniques", Anti-Corrosion Methods and Materials, Vol. 67 No. 1, pp. 59-72. https://doi.org/10.1108/ACMM-05-2019-2128

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Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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