A discussion of the reliability of electrochemical impedance spectroscopy data from coated metals
- S.C. Johnson & Son Inc., Racine, WI (United States)
Electrochemical Impedance Spectroscopy (EIS) has been used to measure coating delamination, metallic corrosion under coatings, and uptake of water. Correlations between predictions developed from EIS data and actual long-term corrosion and/or coating behavior have also been published. The need for repetitive measurements when making EIS measurements on coated metals, and artificial responses in EIS spectra for electrodes exposed to high resistivity electrolytes of values that can span several orders of magnitude, particularly when metallic corrosion occurs. It appears that the magnitude of the range of capacitance values decreases as the test electrolyte resistivity increases. Variations in EIS spectra are caused by the test specimen and not equipment measurement errors. The existence of a range of parameter values leads to the need for collecting multiple repetitions for each metal/electrolyte variable under study.
- OSTI ID:
- 141863
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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