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Sensors 2009, 9(11), 8391-8398; doi:10.3390/s91108391

A Galvanic Sensor for Monitoring the Corrosion Condition of the Concrete Reinforcing Steel: Relationship Between the Galvanic and the Corrosion Currents

1
Laboratório Nacional de Engenharia Civil (LNEC), Av. do Brasil 101, 1700-066 Lisboa, Portugal
2
Centro de Ciências Moleculares e Materiais (CCMM), DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande Ed.C8, 1749-016 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Received: 27 August 2009 / Revised: 24 September 2009 / Accepted: 16 October 2009 / Published: 26 October 2009
(This article belongs to the Section Chemical Sensors)
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Abstract

This work reports a study carried out on the design and performance of galvanic and polarization resistance sensors to be embedded in concrete systems for permanent monitoring of the corrosion condition of reinforcing steel, aiming to establish a correlation between the galvanic currents, Igal, and the corrosion currents, Icorr, estimated from the polarization resistance, Rp. Sensors have been tested in saturated Ca(OH)2 aqueous solutions, under a variety of conditions, simulating the most important parameters that can accelerate the corrosion of concrete reinforcing steel, such as carbonation, ingress of chloride ions, presence or absence of O2. For all the conditions, the influence of temperature (20 to 55 ºC) has also been considered. From this study, it could be concluded that the galvanic currents are sensitive to the various parameters following a trend similar to that of the Rp values. A relationship between the galvanic and the corrosion current densities was obtained and the limiting values of the Igal, indicative of the state condition of the reinforcing steel for the designed sensor, were established. View Full-Text
Keywords: galvanic sensor; polarization resistance sensor; corrosion rate; reinforcing steel; carbonation; chloride ions galvanic sensor; polarization resistance sensor; corrosion rate; reinforcing steel; carbonation; chloride ions
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Pereira, E.V.; Figueira, R.B.; Salta, M.M.L.; Da Fonseca, I.T.E. A Galvanic Sensor for Monitoring the Corrosion Condition of the Concrete Reinforcing Steel: Relationship Between the Galvanic and the Corrosion Currents. Sensors 2009, 9, 8391-8398.

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