A coupled multielectrode sensor of a Cu-Cr-Nb alloy was fabricated to test the corrosion behavior of this material in dry air, wet air and immersion in a 0.5 M NaCl solution. The maximum localized corrosion rates for the Cu-Cr-Nb probe were <0.4 μm/yr (the lower detection limit of the instruments) in dry air, 50 μm/yr in humid air (~80% relative humidity), and 90 μm/yr in 0.5 M NaCl solution. The corrosion characteristics of the Cu-Cr-Nb alloy were compared with those of an electrolytical copper (CDA 110 alloy) when immersed in 0.5 M solution of NaCl over a period of one month. Maximum localized corrosion rates for the two alloys were similar (90 μm/yr), as were the corrosion products (primarily copper chloride compounds), and corrosion morphology (localized pitting). The tests indicated that the coupled multielectrode sensor is an effective technique for on-line monitoring of the corrosion behavior of the Cu-Cr-Nb alloy in dry air, humid air, or immersion in a dilute NaCl solution.

Subject
Sensors, Corrosion rate, Probes, Maximum localized corrosion, Copper alloys, Corrosion products, Sodium chloride solution, Anodic current, Corrosion probes, Immersion, Copper, Stainless steel, Electrodes
Keywords:
Cu-Cr-Nb alloy, corrosion monitoring, coupled multielectrode sensors, localized corrosion, online corrosion sensor, corrosion probe, real-time corrosion sensor, localized corrosion rate
© 2006 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).
2006
Association for Materials Protection and Performance (AMPP)
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