Electrochemical Characterization of a Solid Embeddable Ag/AgCl Reference Electrode for Corrosion Monitoring in Reinforced Concrete

In this study, a new solid embeddable Ag/AgCl reference electrode (RE) was electrochemically investigated for corrosion monitoring in reinforced concrete. The electrode was fabricated by applying the cement mortar as the bottom layer, and the polymer gel as electrolyte. Several electrochemical metho...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2014/12/05, Vol.82(12), pp.1040-1046
Main Authors: JIN, Ming, XU, Jinxia, JIANG, Linhua, GAO, Guofu, CHU, Hongqiang, XIONG, Chuansheng, GAO, Hailang, JIANG, Peng
Format: Article
Language:English
Subjects:
Ag/AgCl
Chlorides
Concretes
Corrosion
Current density
Electrochemical Tests
Electrodes
Monitoring
Reference Electrode
Reinforced concrete
Silver
Steel Corrosion
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Summary:In this study, a new solid embeddable Ag/AgCl reference electrode (RE) was electrochemically investigated for corrosion monitoring in reinforced concrete. The electrode was fabricated by applying the cement mortar as the bottom layer, and the polymer gel as electrolyte. Several electrochemical methods were applied. The experiments were carried out in simulated concrete solutions and concrete. Furthermore, an exposure period over 1 year was used to evaluate the stability of the electrodes embedded in concrete. It has been found that the electrode potential was not obviously affected by the chloride concentration, but affected by the pH value of solution. The Ag/AgCl RE had uniformity in concrete environments. The reversibility of Ag/AgCl RE in all solutions is only within ±4 mV. Besides, potentiodynamic tests revealed that the Ag/AgCl RE had a high exchange current density, which was advantageous when using Ag/AgCl RE to conduct resistance tests. Galvanostatic application of 0.2 µA/cm2 caused little variation of potential with time (∼30 mV in several days), indicating the presence of a finite polarization resistance. As a result, the new solid Ag/AgCl RE was suitable as a sensor electrode for concrete structures.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.82.1040