EIS (Electrochemical Impedance Spectroscopy) has been suggested as a field tool that can predict the remaining life in a protective coating by measuring the film’s resistance to electrical current (its impedance). The authors will briefly review the theory behind EIS and discuss its current application in both the laboratory and in the field. Data from recent studies will be used to examine the viability of the technique.

A model has been developed to show how EIS can be adapted for field use on structures such as bridges, pipelines, and storage vessels. This model may allow the user to collect data at various intervals during routine evaluations (eg. biannual bridge surveys) to predict the condition of the coating on the structure and may permit a forecast of the optimal time for repainting.

Subject
Electrochemical impedance spectroscopy, Barriers, Coating performance, Protective coatings, Coatings, Electrochemical cells, Impedance, Fusion bonded epoxy coating, Impedance measurements, Corrosion protection, Blistering, Deterioration, Barrier coatings
© 2002 Association for Materials Protection and Performance (AMPP). All rights reserved. This work is protected by both domestic and international copyright laws. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2002
Association for Materials Protection and Performance (AMPP)
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