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Incentives for Using LEIM in the Investigation of Corrosion Initiation on Organic Coated Alloys

Published online by Cambridge University Press:  17 March 2011

S. R. Taylor  and
A.M. Mierisch
S. R. Taylor
Affiliation:
Center for Electrochemical Science and Engineering University of Virginia Charlottesville, VA, 22904, USA
A.M. Mierisch
Affiliation:
Center for Electrochemical Science and Engineering University of Virginia Charlottesville, VA, 22904, USA
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Abstract

Local electrochemical impedance mapping and spectroscopy (LEIM/S) have become important tools for the investigation of local electrochemical breakdown events associated with the degradation of organically coated metals in aqueous environments. LEIM/S of organic coated metal substrates has revealed local degradation events that are distributed spatially and temporally. These observations provide support to a number of long-standing theories, as well as provide new insight into the damage process. The local changes in impedance observed at early stages of immersion support the presence of virtual pores, while the metastability of impedance peaks representing the local changes provide evidence of healing via corrosion product formation. Each of these are long-standing theories used to explain global electrochemical impedance measurements. This paper will provide an overview of some of the events observed using LEIM and examine these results in the context of recent analytical and numerical models. Models used to predict the electric field above an equipotential disk electrode support the interpretation of most experimental LEI data as being representative of chemical and physical phenomenon and not a result of measurement artifact. However, certain features may be an artifact of the finite nature of the experimental process. The interpretation of LEIM events in view of current experimental and modeling results will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 699: Symposium R – Electrically Based Microstructural Characterization III , 2001 , R1.4
Copyright
Copyright © Materials Research Society 2002

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