An algorithm was developed in which galvanostatic regulation of electrochemical impedance measurements is conducted with an amplitude of current perturbation that is adjusted at each frequency to yield a desired variation in potential. Measurements of three previous frequencies are used to estimate the value of the impedance at the target frequency. The algorithm was implemented using a graphically based general interfacing software on a personal computer. Experimental results illustrated artifacts that can arise as a result of galvanostatic measurement with a fixed current amplitude or as a result of potentiostatic measurements for systems with a changing corrosion potential. A demonstration was presented of the use of variable-amplitude galvanostatically modulated impedance spectroscopy to monitor corrosion of copper in synthetic seawater.
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1 April 1998
Research Article|
April 01 1998
Variable-Amplitude Galvanostatically Modulated Impedance Spectroscopy as a Tool for Assessing Reactivity at the Corrosion Potential Without Distorting Temporal Evolution of the System Available to Purchase
P.T. Wojcik;
P.T. Wojcik
fn1-1_3284855
*Department of Chemical Engineering, University of Florida, Gainesville, FL 32611.
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M.E. Orazem
M.E. Orazem
**Department of Chemical Engineering, University of Florida, Gainesville, FL 32611.
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Present address: Merck & Co., Inc., 3517 Radium Springs Road, Albany, GA 32611.
Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
1998
CORROSION (1998) 54 (4): 289–298.
Citation
P.T. Wojcik, M.E. Orazem; Variable-Amplitude Galvanostatically Modulated Impedance Spectroscopy as a Tool for Assessing Reactivity at the Corrosion Potential Without Distorting Temporal Evolution of the System. CORROSION 1 April 1998; 54 (4): 289–298. https://doi.org/10.5006/1.3284855
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