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Understanding Coating and Substrate Heterogeneities using Electrochemical Impedance Methods

Published online by Cambridge University Press:  10 February 2011

A. M. Mierisch  and
S. R. Taylor
A. M. Mierisch
Affiliation:
Center for Electrochemical Science and Engineering, Dept. of Materials Science, University of Virginia, Charlottesville, VA 22903, srt6p@sl.mail.virginia.edu
S. R. Taylor
Affiliation:
Center for Electrochemical Science and Engineering, Dept. of Materials Science, University of Virginia, Charlottesville, VA 22903, srt6p@sl.mail.virginia.edu
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Abstract

This study examines natural breakdown events on organic coated AA 2024-T3 coated using Local Electrochemical Impedance (LEI) mapping (M) and spectroscopy (S). LEIM was able to identify not only different types of defects on this system, but also provided information about the kinetics and stages of development of these defects. Supportive evidence regarding the impedance characteristics of these defects was provided by Capillary Electrophoresis (CE). Data from early stages of defect development indicate that an increased impedance develops at the site. This is related to either the development of aggregated water or electrolyte, as well as corrosion product development. Direct evidence of defect healing is also provided.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 500: Symposium EE – Electrically Based Microstructural Characterization II , 1997 , 35
Copyright
Copyright © Materials Research Society 1998

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