This research used Electrochemical Impedance Spectroscopy (EIS) as a non-destructive technique to evaluate coating performance and determine the electrochemical characteristics of hull treatments. The evaluation provided information on corrosion resistance and cathodic protection-influencing characteristics. The coating's impedance was analyzed while exposed to ambient versus 640 psi (4.5 MPa) pressure and immersion times of 1 to 9 days in seawater. Eleven specimen types were evaluated based on coating seam orientation and composition. The data support the conclusion that there was no effect on impedance values and phase shifts due to orientation, formulation, pressure or immersion time. However, temperature increase above 30° was shown to decrease the impedance values of the specimens.

Subject
Circuits, Pressure vessels, Electrochemical impedance spectroscopy, Zinc rich coatings, Coatings, Substrates, Impedance, Ambient barometric pressure, Specimen preparation, Steel, Immersion, Corrosion protection, Polyethylene
Keywords:
impedance, coating, corrosion, protection, hull, steel, pressure, temperature, seawater, equivalent circuit
© 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)
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