Long duration measurements of the crevice corrosion rate of rolled, welded and cast materials of one high-alloyed austenitic stainless steel (UNS S31254) and one high-alloyed duplex stainless steel (UNS S32750) have been performed at 15, 25 and 40°C in seawater. The crevice specimens were artificially initiated before they were transferred to test loops. In most cases the crevice corrosion rate increased with the time until a sudden drop of the current density occurred due to repassivation. Propagation of crevice corrosion can thus occur at temperatures normally regarded as lower than the initiation temperature. The depth of the corrosion attacks was, however, restricted and active crevice corrosion may not necessarily lead to practical corrosion failures.

Subject
Materials, Corrosion rate, Repassivation, Repassivation potentials, Corrosion initiation, Gaskets, Natural seawater, Seawater, Crevices, Corrosion attacks, Anodic reactions, Current densities, Crevice corrosion
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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