Equivalent Electrical Circuits Fitting of Electrochemical Impedance Spectroscopy for Rebar Steel Corrosion of Coral Aggregate Concrete

doi:10.11902/1005.4537.2018.108

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (3): 260-266 DOI: 10.11902/1005.4537.2018.108

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Equivalent Electrical Circuits Fitting of Electrochemical Impedance Spectroscopy for Rebar Steel Corrosion of Coral Aggregate Concrete

Bo DA,Hongfa YU(

),Haiyan MA,Zhangyu WU

Department of Civil Engineering, Nanjing University of Aeronautic and Astronautic, Nanjing 210016, China

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Abstract

Nyquist plots and Bode impedance module plots of rebar steel in coral aggregate concrete (CAC) exposed in artificial sea water for different times were assessed by means of electrochemical impedance spectroscopy (EIS). The suitable equivalent electric circuit (EEC) for fitting data of the rebar steel corrosion in CAC was proposed. The conversion relationship between charge transfer resistance (R_ct) and polarization resistance (R_p) was established. The influence of the thickness of concrete cover and the rebar steel types on the corrosion behavior of rebar steel in CAC was discussed. The results show that: the EEC mode for the rebar steel electrode in CAC were R_s(C_cR_c)(Q_dlR_ct) in the passivation stage and R_s(C_cR_c)(Q_dl(R_ctW)) in the corrosion stage respectively. As the thickness of concrete cover increased, the R_ct of rebar steel gradually increased, as did the corrosion resistance. Moreover, the corrosion resistance of different rebar steels decreases as the following sequence: 2205 duplex stainless steel ＞316 stainless steel ＞new organic coated steel ＞zinc-chromium coated steel ＞common steel. Therefore, for CAC structures in actual engineering practice, it was suggest to adopt new organic coated steel, while the thickness of concrete cover should be thicker than 5.5 cm, which could prolong the initial stage of rebar steel corrosion, reduce the corrosion rate and prolong the service life of the CAC structure.

Key words: coral aggregate concrete reinforcement corrosion electrochemical impedance spectroscopy method equivalent electric circuit concrete cover thickness reinforcement types

Received: 31 July 2018

ZTFLH:

TU528

Fund: National Natural Science Foundation of China(51508272);National Natural Science Foundation of China(51678304);National Natural Science Foundation of China(51878350);National Natural Science Foundation of China(11832013);Natural Science Foundation of Jiangsu Province(BK20180433);China Postdoctoral Science Foundation(2018M630558)

Corresponding Authors: Hongfa YU E-mail: yuhongfa@nuaa.edu.cn

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Bo DA,Hongfa YU,Haiyan MA,Zhangyu WU. Equivalent Electrical Circuits Fitting of Electrochemical Impedance Spectroscopy for Rebar Steel Corrosion of Coral Aggregate Concrete. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 260-266.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.108 OR https://www.jcscp.org/EN/Y2019/V39/I3/260

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[1]	Bo DA,Hongfa YU,Haiyan MA,Zhangyu WU. Influence of Inhibitors on Reinforced Bar Corrosion of Coral Aggregate Seawater Concrete[J]. 中国腐蚀与防护学报, 2019, 39(2): 152-159.

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