Mechanisms of differential-flow-rate-cell corrosion (differential-aeration-cell corrosion caused by differential flow rates) of cast iron in seawater were studied. Potential and current density distributions produced by the differential-flow-rate-cell were measured on actual pumps and a model test cell. Boundary element analysis was also performed on differential-flow-rate-cell corrosion occurred in the model test cell. These studies demonstrate that differential-flow-rate-cell corrosion has characteristics similar to those of galvanic corrosion, and thus can be treated in the same manner as galvanic corrosion.

Subject
Noble potential, Corrosion rate, Anodic polarization curves, Free corrosion potential, Seawater, Boundary element method, Current densities, Corrosion modeling, Cast iron, Electric potential, Active passive cells, Concentration cells, Electrode potential
Keywords:
differential-aeration-cell corrosion, differential-flow-rate-cell corrosion, pump, galvanic corrosion, boundary element method, active-passive cell, potential, current density, polarization curve, cast iron
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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