Recent emphasis in marine cathodic protection studies has focused upon the slope parameter approach to polarization data representation according to the relationship
where ϕc and ιc are cathode potential and current density, respectively, ϕa is anode potential, Rt is total circuit resistance and Ac is cathode area. In conjunction with the rationale represented by this expression a series of sacrificial anode cathodic protection experiments was performed which involved 1) a dual magnesium-aluminum anode, 2) application of adequate cathodic protection to specimens that were initially underprotected and 3) depolarization of a specimen that was initially well protected. In each case the results were analyzed in terms of the above expression for the purpose of evaluating any path dependence (that is, the potential-current density history) involved in reaching the ultimate polarized state; and the results are discussed within the context of corrosion control for offshore structures.
Subject
Depolarization, Cathodes, Anode potential, Cathodic protection, Cathodic potential, Magnesium anodes, Current densities, Cathodic current density, Steel, Electric potential, Aluminum anodes, Polarization, Anodes
Keywords:
Cathodic protection, cathodic polarization, sea water, steel, sacrificial anode, magnesium anode, aluminum anode, depolarization
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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