Highly alloyed stainless steels can suffer from dissimilar metal crevice corrosion when creviced with certain other stainless alloys. In order to understand this phenomenon better, the solution which forms inside such crevices was collected and analyzed with ion chromatography and capillary electrophoresis for its metal ion content. These analyses provided the data required to design bulk solutions for electrochemical measurements. Electrochemical measurements in these simulated crevice solutions were made and compared to measurements made in simple acidified chloride solutions. The simulated crevice solutions were found to be much more aggressive. These results are used to rationalize the observations of dissimilar metal crevice corrosion of Alloy S44735 when it is creviced with Type 316 and the failure of electrochemical measurements in simple acidified chloride solutions to predict this attack. The roles of ohmic drop and chloride ion concentration are considered.

Subject
Materials, Corrosion resistant alloys, Composition, Stainless alloys, Dissolution, Chloride solutions, Acidity, Crevices, Corrosion attacks, Crevice corrosion, Metals, Polarization, Alloys
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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