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Variable Amplitude Galvanostatically Modulated Impedance Spectroscopy as a Non-Invasive Tool for Assessing Reactivity at the Corrosion Potential

Product Number: 51300-97282-SG
ISBN: 97282 1997 CP
Author: Paul T. Wojcik, Mark E. Orazem
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An algorithm is described 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 graphlcally based general interfacing software on a personal computer. Expenmental results illustrate artifacts which 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. KeyWords: Corrosion, Experimental Techniques, Linearity, Impedance Spectroscopy
An algorithm is described 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 graphlcally based general interfacing software on a personal computer. Expenmental results illustrate artifacts which 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. KeyWords: Corrosion, Experimental Techniques, Linearity, Impedance Spectroscopy
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