A corrosion monitoring system using electrochemical noise measurements and their numerical analysis is described. Electrochemical noise was measured in a freely corroding system containing three identical metal electrodes. A voltage signal generated by the first pair of electrodes and a current signal generated by the second pair were measured and the data fed into a computer. A mathematical model including signal processing and pattern recognition was developed and implemented in computer software. Analysis of the electrochemical noise enabled determination of the corrosion rate and the corrosion type. The reliability of the corrosion monitoring system was tested with various reference methods (visual inspection, SEM analysis, I vs E curves, electrical resistance). Tests were performed on steel and aluminium in aqueous solutions of various pH and conductivity values.

Subject
Voltage, Noise measurements, Corrosion currents, Corrosion rate, Electrochemical noise, Aluminum, Sodium chloride, Density, Electrochemical current, Corrosion monitoring, Stainless steel, Electrodes, Uniform corrosion
Keywords:
Corrosion Monitoring, Electrochemical Noise, Power-Spectrum Density, I vs E curves, Uniform Corrosion, Pitting Corrosion, Corrosion Rate
© 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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