Pitting corrosion in Cu:Ni heat exchanger tubing in treated and untreated water service has become a wide spread problem. A corrosion evaluation of pitting corrosion in a once through heat exchanger using river water used potentiodynamic corrosion testing techniques to determine that the problem was primarily related to water velocity. Use of fully reversed polarization scans showed increasing crevice corrosion tendencies with increasing water velocities. Tests with ferrous sulfate demonstrated that additions of 1.0 ppm or less Fe+2 could reduce the crevice corrosion tendencies.

Subject
Water, Electrochemical cells, Corrosion rate, Glass, Corrosion cells, Sulfates, Corrosion testing, Iron, Hysteresis, Tubing, Heat exchangers, Pitting, Sulfides
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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