The performance of the electrochemical noise sensors made of carbon steel and stainless steels were tested and compared with the coupled multielectrode array sensors made of the same materials as real-time corrosion sensors. No correlation was observed between the pit index signals for localized corrosion from the electrochemical noise sensors and the corrosivity of the solution. The noise resistance signals for general corrosion that were averaged over long time intervals appeared to correlate with the corrosivity of the solutions. However, the fluctuation of noise resistance signals was significant and often overwhelmed the measured signals. Averaging over long time intervals were required to obtain meaningful noise resistance signals for the electrochemical noise (EN) sensors. Thus the EN sensors may not be reliable for real-time measurement of localized corrosion. It may be used for real-time measurement of general corrosion. The responses of the coupled multielectrode array sensors to the localized corrosivity of the solutions were excellent.

Subject
Pits, Water, Sensors, Electrochemical cells, Electrochemical noise, Corrosivity, Pipeline integrity management, Sodium chloride, Sodium chloride solution, Carbon steel, Localized corrosion, Stainless steel, Types of corrosion
Keywords:
multielectrode sensor, multielectrode, multiple electrodes, corrosion sensor, electrochemical noise, real-time corrosion sensor, online corrosion sensor
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.