Impedance based method for non-contact determination of the corrosion rate in buried metallic structures

The electrochemical impedance spectroscopy has been employed in the present investigation to assess the polarisation resistance of carbon steel rebars in different electrolytes. The measurements have been performed using the classical 3-electrode arrangement, where the element under test is the work...

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Bibliographic Details
Published in:European journal of environmental and civil engineering 2011-01, Vol.15 (7), p.1097-1103
Main Authors: Keddam, Michel, Nóvoa, X. Ramón, Puga, Beatriz, Vivier, Vincent
Format: Article
Language:English
Subjects:
contact-less method
corrosion monitoring
electrochemical impedance spectroscopy
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Summary:The electrochemical impedance spectroscopy has been employed in the present investigation to assess the polarisation resistance of carbon steel rebars in different electrolytes. The measurements have been performed using the classical 3-electrode arrangement, where the element under test is the working electrode of the potentiostat, and a new 4-electrode arrangement where the element under test is floating from the electrical point of view (e.g. contact-less technique). The polarisation resistance values obtained using the contact-less technique are very close to those obtained using the traditional 3-electrode arrangement. The measurements, performed in a wide range of electrolyte resistivity values (including mortar) have thus demonstrated the applicability of this new technique for on-site corrosion rate assessment.
ISSN:1964-8189
2116-7214
DOI:10.1080/19648189.2011.9695296