A laboratory investigation using a specially designed circulating test rig was carried out to study the effectiveness of achieving complete cathodic protection of UNS C71500 heat exchanger tubes in seawater applications. Results indicated that the galvanic current distribution covered the entire 6m length of the tube. The presence of sulphide ions as pollutants in seawater shifted the galvanic potentials of the tubes to more active potentials and prevented the formation of protective films that normally form.

Subject
Ions, Composition, Cathodic protection, Tubes, Sulfide films, Seawater, Corrosion products, Film formation, Electric potential, Carbon steel, Sulfides, Galvanic current, Alloys
Keywords:
Sacrificial Protection, Galvanic Coupling, Heat Exchanger, Carbon Steel, UNS C71500 Alloy Tubes, Seawater and Sulfide Ions Pollutants
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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