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Author
Nguyen, T. | Lin, C.
Title
In-Situ Measurement of Chloride Ion at the Coating/Metal Interface.
Coporate
National Institute of Standards and Technology, Gaithersburg, MD
Journal
Journal of Adhesion, Vol. 33, 241-252, 1991
Book or Conf
Ahesion Society, Inc. Annual Meeting, 13th. February 19-21, 1990, Savannah, GE, 1991
Keywords
corrosion | ion selective microelectrodes | analytical instrumentation | blister formation | steels | surfaces
Abstract
One of the main reasons for the lack of a complete understanding of corrosion and adhesion failures of a coated metal is the lack of analytical instrumentation to probe the behaviors of corrosive agents at the coating/metal interface. We have developed a procedure based on microelectrodes for studying in situ the behavior of chloride ions at a coating/metal interface. The procedure requires an attachment of a double-barreled Cl ion-selective microelectrode at the coating/metal interface, thus allowing direct measurements of Cl concentration changes at localized areas under a coating. The procedure provided very useful information for mechanistic studies of corrosion under coatings, as well as for transport studies of Cl ions through a coating. The procedure should also be useful for studying the roles of Cl in localized corrosion.