There is a great deal of industry discussion concerning the appropriateness of the use of the “100 mV Polarization” cathodic protection criterion in facilities where multiple metallic compositions (mixed metals) are installed underground and are mechanically/electrically bonded. The purpose of this paper is to present technical support for the use of this criterion, in this application, and to recommend field practices to compensate for its’ inherent weakness and improve confidence in its’ use.

Subject
Noble potential, Cathodes, Steel structures, Underground structures, Polarization criteria, Cathodic protection, Cathodic potential, Metal surfaces, Potential measurements, Electrochemical current, Metals, Electrolytes, Anodes
Keywords:
cathodic protection criteria, mixed metal systems, 100 mV polarization criterion
© 2008 Association for Materials Protection and Performance (AMPP). All rights reserved. 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).
2008
Association for Materials Protection and Performance (AMPP)
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