Corrosion Behavior of Reinforcing Steel in Concrete Subjected to Chloride Contamination By EIS

Authors

Rong-Gang Hu, Solid Surfaces,Xiamen University,Xiamen 361005,China;
Rong-Gui Du, Solid Surfaces,Xiamen University,Xiamen 361005,China;
Chang-Jian Lin, Solid Surfaces,Xiamen University,Xiamen 361005,China;

Corresponding Author

Chang_Jian Lin

Abstract

Electrochemical impedance spectroscopy(EIS) was employed to study the influence of chloride on the corrosion behavior of reinforcing steel in concrete.In Nyquist plot,the spectrum consists of two semicircles,indicating that the reinforced concrete system contained two time constants,one derived from electrical double layer of reinforcing steel and the other from the deposition film of concrete layer.The depressed semicircle in lower frequency featured the non_faradic behavior of the electrical double layer (EDL) deviated from idea capacitor due to diffusive effect which was attributed to the surface roughness of rebar and the inhomogenity of concrete layer.Then the EDL was denoted by a constant phase element (CPE) other than a capacitor in the equivalent circuit.At the late stage of immersion,a new element,Warburg resistance W evolved along with dramatic decrease in the value of polarization resistance,Rp,convincing the break down of the passive film and the initiation of active corrosion.The increase of [Cl-] in external solution prominently accelerated this trend.

DOI Link

https://doi.org/10.61558/2993-074X.1504

Publication Date

2003-05-28

Online Available Date

2003-05-28

Revised Date

2003-05-28

Received Date

2003-05-28

Recommended Citation

Rong-Gang Hu, Rong-Gui Du, Chang-Jian Lin. Corrosion Behavior of Reinforcing Steel in Concrete Subjected to Chloride Contamination By EIS[J]. Journal of Electrochemistry, 2003 , 9(2): 189-195.
DOI: 10.61558/2993-074X.1504
Available at: https://jelectrochem.xmu.edu.cn/journal/vol9/iss2/11

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