This review is an update of the review presented by the author in 1988 (1). The use of corrosion sensors is illustrated for corrosion monitoring in a sewer system. In an application related to microbiologically influenced corrosion (MIC) it is demonstrated that Tafel slopes and the corrosion current density can be obtained from polarization curves recorded in the non-Tafel region near the corrosion potential. The application of electrochemical impedance spectroscopy (EIS) is illustrated for an anodized Al alloy and for monitoring of pit growth rates for various Al alloys. For polymer coated steel it is shown that certain parameters can be determined with impedance measurements in the high-frequency region which are related to coating delamination and a decrease of the coating resistivity. Analysis of potential and current noise has demonstrated that potential noise alone cannot be used to determine the occurrence of localized corrosion. Examples of the use of electrochemical noise analysis (ENA) are presented for Al/SiC in various solutions and for Pt.

Subject
Pits, Electrochemical impedance spectroscopy, Zinc rich coatings, Materials, Electrochemical noise, Sodium chloride, Impedance, Polarization curves, Polymers, Experimental data, Aluminum alloys, Microbiologically influenced corrosion, Electrode potential
Keywords:
polarization resistance, linear polarization, electrochemical impedance spectroscopy, microbiologically influenced corrosion, anodized aluminum, copper alloys, pit growth rates, electrochemical noise analysis, polymer coatings, aluminum alloys
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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