A critical description of the permutation of EIS data points technique for corrosion measurements and monitoring
- Royal Military College, Kingston, Ontario (Canada). Dept. of Chemistry and Chemical Engineering
Electrochemical impedance spectroscopy (EIS) has been proven to be a rapid and accurate technique for measuring corrosion rates in the most difficult situations and for yielding precious information concerning the occurrence of localized corrosion. But routine monitoring with EIS requires that certain assumptions be made and the data be processed automatically. To achieve these goals, a method was developed which consists in finding the geometric center of an arc formed by three successive data points on a complex impedance diagram. The three point analysis technique was further developed by permuting the data points involved in the projection of centers in order to obtain a population of projected centers. This last improvement permitted automation of the data analysis while providing some necessary statistical information concerning the adherence of the results with the resistive-capacitive (RC) behavior which is assumed for the evaluation of the parameters related to the general and localized corrosion rates. This paper illustrates the efficiency of EIS in a field situation with results obtained during the evaluation of organic corrosion inhibitors against sour media and reviews the mathematical principles of the projection/permutation (ProPer) technique for routine analysis of EIS data points.
- OSTI ID:
- 80086
- Report Number(s):
- CONF-940222-; TRN: IM9532%%213
- Resource Relation:
- Conference: Corrosion 94: National Association of Corrosion Engineers (NACE) international annual conference, Baltimore, MD (United States), 28 Feb - 4 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of Corrosion/94 conference papers; PB: 5005 p.
- Country of Publication:
- United States
- Language:
- English
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