Cathodic protection and coatings, when used together, can be an effective means of corrosion protection. However, if set up improperly, excessive delamination, or cathodic disbondment, of the coating may result. Several disbondment related issues are addressed here, including possible disbondment mechanisms, effects of operating temperature, paint film thickness, current consumption characteristics, and cathodic disbondment testing methodology. Two popular ASTM methods: ASTM G8, “Standard Test Methods for Cathodic Disbonding of Pipeline Coatings,” and ASTM G42, “Standard Test Methods for Cathodic Disbonding of Pipeline Coatings Subjected to Elevated Temperatures,” are discussed in detail with regard to the experimental procedures used and results generated.

Subject
Holidays, Electric current, Test methods, Coatings, Cathodic protection, Substrates, Pipelines, Cathodic disbondment, Disbondment, Polyurethanes, Epoxy coatings, Epoxies, Blistering
© 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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