An electrochemical cell was developed and evaluated for use as an on-line monitor of crevice corrosion in chemical process systems. It consists of a prepared crevice containing an anode which is connected through a zero resistance ammeter to a freely exposed cathode. A string bridge provides a solution path between the crevice region and a reference electrode that is attached externally to the cell. Experiments were performed with Type 304 stainless steel and Grades 2 and 7 titanium alloys in acidified chloride-containing solutions. A continuous, semi-quantitative, real-time indication of crevice corrosion was provided by the current flowing between anode and cathode, and a more qualitative signal consisted of shifts in corrosion potential. Both cell current and corrosion potential correlated well with the initiation and propagation of crevice corrosion. Results were also compared with crevice corrosion produced by a standard sandwich-type crevice cell; in nearly every instance, corrosion damage on the anode was similar to that produced by the standard cell.

Subject
Cathodes, Electrochemical cells, Sodium chloride, Crevices, Corrosion attacks, Electrochemical current, Crevice corrosion, Anodic current, Titanium, Titanium alloys, Occluded cells, Electrode potential, Anodes
© 1981 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).
1981
Association for Materials Protection and Performance (AMPP)
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