An effective boundary element method is developed for predicting corrosion and corrosion protection of a complicated structure. In this method, the region to be analyzed is divided at first into a target sub-region and other adjacent sub-regions. Then, equivalent-boundary-condition related to an adjacent sub-region, which is defined as the relationship between the potential and the current density on the interface dividing the adjacent and the target sub-region, is obtained by analyzing the adjacent sub-region with an appropriate model, e.g., a closed 3D model or an open axisymmetric model. Finally, the target sub-region is analyzed using these equivalent-boundary-conditions with an appropriate model, which can be of a type different from those for the adjacent other sub-regions. It is easy for this method to perform a trial and error type design of the target sub-region, because the same equivalent-boundary-conditions can be used repeatedly. An example analysis is carried out for a cathodic protection system of seawater pump to demonstrate the accuracy ad usefulness of this combined method.

Subject
External surfaces, Piping, Zinc anodes, Boundary conditions, Anode surfaces, Seawater, Boundary element method, Polarization curves, Surface analysis, Current densities, Internal surfaces, Electric potential, Elements
Keywords:
boundary element method (BEM), combined analysis, 2D, 3D, axisymmetry, potential, current density, cathodic protection, galvanic corrosion, polarization curve
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.