An electrochemical sensor which incorporates a counter electrode (CE) and a reference electrode (RE) into an o-ring has been developed for in situ monitoring of crevice corrosion initiation and propagation. It is applicable to crevice corrosion situations where the crevice is created by a gasket or an o-ring and the attack occurs in that crevice. It is shown that polarization resistance (Rp) values calculated from in situ electrochemical impedance measurements correlate with the onset of crevice attack and with its propagation for crevice corrosion of alloy 625 (UNS N06625) in 3.5% NaCl and in 10% FeCl3 solutions.

Subject
Sensors, Sodium chloride, Corrosion initiation, Impedance, Crevices, Impedance measurements, Corrosion attacks, Sodium chloride solution, Electrochemical impedance, Crevice corrosion, Immersion, Alloys, Polarization resistance
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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