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Paint As a Corrosion Sensor; Acrylic Coating Systems

Published online by Cambridge University Press:  10 February 2011

J. Zhang  and
G. S. Frankel
J. Zhang
Affiliation:
Fontana Corrosion Center, 2041 College Rd., The Ohio State University, Columbus, OH 43210
G. S. Frankel
Affiliation:
Fontana Corrosion Center, 2041 College Rd., The Ohio State University, Columbus, OH 43210
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Abstract

Paint systems containing color-change or fluorescing compounds have been found to be sensitive to underlying corrosion processes by reacting to the pH increase associated with the cathodic reaction that accompanies corrosion. The sensitivity of these coating systems for detection of cathodic reactions associated with corrosion was determined by applying constant cathodic current and measuring the charge at which color change or fluorescence is detected. Visual observation of coated samples with the unaided eye can detect changes resulting from a charge corresponding to a hemispherical pit with depth on the order of 3–15 microns. Electrochemical Impedance Spectroscopy was also performed to test the influence of the indicating compound addition on the coating corrosion protectiveness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 503: Symposium JJ – Nondestructive Characterization of Materials in Aging Systems , 1997 , 15
Copyright
Copyright © Materials Research Society 1998

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References

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