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08382 Rp Measurements: Potentiostatically or galvanostatically?

Picture for 08382 Rp Measurements: Potentiostatically or galvanostatically?
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Product Number: 51300-08382-SG
ISBN: 08382 2008 CP
Author: François Huet, Ricardo Nogueira, and Aude Guyader
Publication Date: 2008
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$20.00
$20.00
The estimation of corrosion current in field applications is mostly based on the Stern-Geary relationship and direct measurement of the polarization resistance Rp mainly with the linear polarization resistance technique but also with the electrochemical impedance technique. Technical advances in the last years effectively made available very simple and practical devices for field corrosion engineers. In spite of their convenience, the measurements reliability is based upon basic assumptions, such as the system linearity for example, which are not a priori ensured and can be the source of measurement errors. One of these drawbacks is related to the drift of the corrosion potential during the measurements. The present paper investigates the influence of the non-stationarity of the system on Rp measurements. Values of Rp measured with the electrochemical impedance and linear polarization resistance techniques under potentiostatic or galvanostatic control were compared in the case of iron corrosion in stagnant and circulating brine solutions.
The estimation of corrosion current in field applications is mostly based on the Stern-Geary relationship and direct measurement of the polarization resistance Rp mainly with the linear polarization resistance technique but also with the electrochemical impedance technique. Technical advances in the last years effectively made available very simple and practical devices for field corrosion engineers. In spite of their convenience, the measurements reliability is based upon basic assumptions, such as the system linearity for example, which are not a priori ensured and can be the source of measurement errors. One of these drawbacks is related to the drift of the corrosion potential during the measurements. The present paper investigates the influence of the non-stationarity of the system on Rp measurements. Values of Rp measured with the electrochemical impedance and linear polarization resistance techniques under potentiostatic or galvanostatic control were compared in the case of iron corrosion in stagnant and circulating brine solutions.
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