Parallel crevice corrosion tests were conducted in pumped prototypical OTEC seawaters - warm surface seawater and cold deep ocean water. Multiple crevice assemblies were used. The results are generally consistent with results from other test sites, except for some minor variations. It was found that the cold deep-ocean water is somewhat less aggressive than the surface water but it is possible that this difference may disappear over very long periods of exposure. For the high alloy stainless steels, the incubation period for crevice corrosion may be well in excess of sixty days.

Full immunity was shown by the ferritic alloy 29-4C, the austenitic JS 700 and the Ni-base alloy Hastelloy 276. Minor attack was shown by 256 SMo, AL-6XN, JS 777, and Hastelloy G3. AL-6X was immune in the cold water but showed significant corrosion in the warm while the opposite was true for a number of aluminum alloys. Nitronic 50 and alloys 316 and 304 corroded rapidly in both waters.

Subject
Water depth, Water, Materials, Nickel based alloys, Corrosion initiation, Seawater, Crevices, Corrosion attacks, Crevice corrosion, Steel, Stainless steel, Aluminum alloys, Alloys
© 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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