Nickel base alloys such as Alloy 625, C22, C276 and 59 are generally considered to have exceptional corrosion resistance in critical sea water applications at ambient temperature. Test results published in recent years however indicate that severe crevice corrosion of some of these alloys may occur under certain conditions. Exposure tests have been carried out in natural and chlorinated sea water on these alloys, together with two high N alloys, Alloy 24 and Alloy 654SMO. Electrochemical studies and simple mathematical modelling have also been carried out. These data, together with surface studies, help explain the observed phenomena and assist in the safe selection of alloys for critical sea water applications.

This work has been fully sponsored by the Office of Naval Research (ONR), Department of the Navy, Arlington, Virginia.

Subject
Water, Corrosion resistant alloys, Stainless alloys, Metal surfaces, Nickel based alloys, Molybdenum alloys, Corrosion initiation, Crevices, Corrosion attacks, Mathematical models, Corrosion propagation, Crevice corrosion, Alloys
Keywords:
crevice corrosion, sea water, nickel base alloys, high N alloys, mathematical modelling
© 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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