A theoretical analysis of the impedance of polymer-coated steel was performed to identify parameters for assessing coating performance in a short time without rigorous analysis of data from electrochemical impedance spectroscopy. Results of the analysis applied to nine coating systems suggested the breakpoint frequency (fb), the frequency fmin of the phase-angle minimum observed at high frequencies (Φmin), and the ratio of the impedance recorded at Wo frequencies could be used for this purpose. Analysis also showed fb and fmin depended on the delaminated area (Ad) and the coating resistivity (p), while Φmin and the ratio fb/fmin depended only on Ad. Recording of fb, fmin, and Φmin allowed determination of coating damage and, therefore, was recommended for the design of a commercial device for field testing of the remaining lifetime of protective coatings.
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1 September 1993
Research Article|
September 01 1993
Determination of Coating Deterioration with EIS: Part II. Development of a Method for Field Testing of Protective Coatings
F. Mansfeld
F. Mansfeld
*Corrosion and Environmental Effects Laboratory, Department of Materials Science and Engineering, University of Southern California, Los Angeles, CA, 90089-0241.
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
1993
CORROSION (1993) 49 (9): 726–737.
Citation
C.H. Tsai, F. Mansfeld; Determination of Coating Deterioration with EIS: Part II. Development of a Method for Field Testing of Protective Coatings. CORROSION 1 September 1993; 49 (9): 726–737. https://doi.org/10.5006/1.3316106
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