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4. Potential step voltammetry: An approach to corrosion rate measurement of reinforcements in concrete

Author

Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Departamento de Construcciones Arquitectónicas - Departament de Construccions Arquitectòniques, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Agencia Estatal de Investigación, European Commission, Ministerio de Ciencia e Innovación, Ramón, J.E., Gandía-Romero, Jose M., Bataller Prats, Román, Alcañiz Fillol, Miguel, Valcuende Payá, Manuel Octavio, Soto Camino, Juan, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Departamento de Construcciones Arquitectónicas - Departament de Construccions Arquitectòniques, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Agencia Estatal de Investigación, European Commission, Ministerio de Ciencia e Innovación, Ramón, J.E., Gandía-Romero, Jose M., Bataller Prats, Román, Alcañiz Fillol, Miguel, Valcuende Payá, Manuel Octavio, and Soto Camino, Juan

Abstract

[EN] This paper presents a Potentiostatic Step Voltammetry approach to corrosion rate measurement of reinforcements in concrete. We have termed this approach PSV-TE since it is based on the Tafel extrapolation method, but with the added advantage that long and slow potentiodynamic scans are no longer required to obtain the Tafel slopes. In this way, the irreversible polarization of rebars is prevented, so PSV-TE is considered to be a non-destructive method. The Tafel slopes are obtained by fitting the current-time response of the system to a theoretical model which we have outlined and validated previously. In this way, the concrete's electrical resistance and double layer capacity are also obtained. In this study, the optimal PSV-TE design has been established and validated on a range of reinforced concrete specimens. Results show minimal deviation between PSV-TE and reference methods. Therefore, PSV-TE is part of the corrosion monitoring system we have patented.

Published
2020

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