This paper presents the results of a study of the effects of ferrous sulphate and chlorine dosing into the cooling water on the corrosion of aluminium brass and three copper-nickel alloys. The results show a synergistic effect between iron and chlorine which can lead to very rapid attack and early failure under some circumstances. Aluminium brass was the most susceptible to attack, and 66/30/2/2 copper-nickel-iron-manganese the most resistant. Further testing led to the establishment of a set of safe operation conditions for the four alloys tested. Electrochemical studies showed that, in the presence of chlorine, the normal protective film on aluminium brass was not stable and a much less protective film was formed. Tests on the copper-nickel alloys suggested that chlorine modified or changed the film on 90/10 copper-nickel, but had a lesser effect on the 66/30/2/2 copper-nickel-iron-manganese alloy.

Subject
Films, Water, Impingement, Aluminum, Tubes, Iron, Condensers, Corrosion attacks, Film formation, Copper nickel alloys, Chlorine, Brass, Aluminum alloys
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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