Thirteen polymer coating systems on steel have been exposed to Pacific ocean water (NS) and artificial seawater (AS). Impedance data and electrochemical noise data have been obtained for two-electrode systems on a weekly basis. For comparison three-electrode impedance measurements have been performed on a monthly basis. Noise data were obtained several times each week. The impedance and noise data at the Port Hueneme, CA test site (NS) were collected by an on-site computer system with a multiplexer which is controlled via modem by a computer system at CEEL/USC. In the laboratory a more traditional approach was used. Experimental data for two coating systems exposed to NS and AS for three months showed that the experimental approach developed for data collection at a remote test site produced rehable results which were in general agreement with results obtained in the laboratory.

Subject
Electrochemical impedance spectroscopy, Coating performance, Coatings, Rolled steel, Electrochemical noise, Impedance, Seawater, Impedance measurements, Polyamides, Experimental data, Electrochemical data, Epoxies, Coating systems
Keywords:
polymer coating, microbial corrosion, steel, impedance, electrochemical noise
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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