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The Detection And Mapping Of Defects In Organic Coatings Using Local Electrochemical Impedance Methods

Published online by Cambridge University Press:  10 February 2011

S. R. Taylor  and
M. W. Wittmann
S. R. Taylor
Affiliation:
Center for Electrochemical Science and Engineering, Dept. of Materials Science, University of Virginia, Charlottesville, VA 22903, srt6p@uva.pcmail.virginia.edu
M. W. Wittmann
Affiliation:
Center for Electrochemical Science and Engineering, Dept. of Materials Science, University of Virginia, Charlottesville, VA 22903, srt6p@uva.pcmail.virginia.edu
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Abstract

Coating failure initiates as a local event at defects which can result from chemical heterogeneities in the resin or physical defects such as bubbles, underfilm deposits, or pinholes. The ability to detect, map the location, as well as make quantitative in-situ measurements of coating heterogeneities will help identify the source of failure (i.e. coating chemistry, method of application, cure schedule, etc.) and provide insight into the mechanisms of coating degradation. This study used a 5 electrode arrangement to perform local electrochemical impedance spectroscopy (LEIS) on coated steel substrates. Using single frequency measurements, LEIS could successfully detect and map both intentional chemical heterogeneities and physical defects such as subsurface bubbles, underfilm deposits, and pinholes. Efforts to optimize probe design and instrumentation are ongoing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 411: Symposium T – Electricaly-Based Microstructural Characterization , 1995 , 31
Copyright
Copyright © Materials Research Society 1996

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References

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