Many corroding interfaces exhibit electrochemical impedance response similar to that of a polarization resistance (Rp) associated with the corrosion process, in parallel with a constant phase angle element (CPE) having relatively large admittance. Such conditions are encountered often in the case of steel in concrete. While polarization measurements using a forward and reverse potential scan rate (dV/dt) can be helpful to subtract the contribution of an ideal interfacial capacitance (C) by using a C dV/dt correction, in concrete the pronounced frequency dispersion of the CPE complicates the time-domain response, and correction is not straightforward. A solution to this problem was presented and applied to evaluate the CPE parameters and estimate Rp of steel in concrete from cyclic-scan polarization measurements. The technique was demonstrated for experiments with plain steel and galvanized rebar in concrete.
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1 January 1998
Research Article|
January 01 1998
An Improved Method for Estimating Polarization Resistance from Small-Amplitude Potentiodynamic Scans in Concrete Available to Purchase
S.C. Kranc;
S.C. Kranc
*Department of Civil and Environmental Engineering, University of South Florida, Tampa, FL, 33620
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E.I. Moreno
E.I. Moreno
**CINVESTAV, Merida,
Mexico
. Present address: Department of Civil and Environmental Engineering, University of South Florida, Tampa, FL, 33620
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
1998
CORROSION (1998) 54 (1): 20–28.
Citation
A.A. Sagüés, S.C. Kranc, E.I. Moreno; An Improved Method for Estimating Polarization Resistance from Small-Amplitude Potentiodynamic Scans in Concrete. CORROSION 1 January 1998; 54 (1): 20–28. https://doi.org/10.5006/1.3284824
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