Journal Published Online: 01 November 1994
Volume 22, Issue 6

Electrochemical Impedance Spectroscopy for Monitoring Coating Performance in Condensing Environments



A novel method is described for monitoring coating performance in the thin liquid films found in condensing environments, such as in the corrosive condensate found in flue gas desulfurization (FGD) systems. The method involves exposing coated metal panels to controlled environments, created by atomizing solutions of appropriate composition, in fog chambers. The fog deposits on the coated surface as a thin film that simulates the condensate formed in actual service. The performance of the coatings is monitored in situ by electrochemical impedance spectroscopy (EIS) during periods when the exposed coated surfaces are temporarily flooded with bulk solution having the same composition as the condensate. The method has been used to evaluate the effects of sixteen environmental factors on the performance of eight coatings currently used in FGD outlet ducts.

Author Information

Rosenberg, HS
Guild Associates, Inc., Hilliard, OH
Syrett, BC
Electric Power Research Institute, Palo Alto, CA
Pages: 5
Price: $25.00
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Stock #: JTE11858J
ISSN: 0090-3973
DOI: 10.1520/JTE11858J