A study was initiated to evaluate environmentally compliant replacement coatings for use in various aerospace programs. Although coatings that employ chromate primers and conversion coatings work effectively, the Clean Air Act Amendments of 1990 and pending changes in the Clean Water Act make it imperative that alternative coating systems be developed and evaluated. An integral part of this investigation involved the use of electrochemical impedance spectroscopy to provide screening of candidate coating systems. Preliminary results indicated that IVD/Al afforded equal or better protection for AA2219-T87 and AISI 4340-steel substrates in comparison to specimens protected by more conventional coating systems. Results from electrochemical impedance spectroscopy measurements provided reliable predictions on the performance of the various coating systems.

Subject
Steel panels, Primers, Electrochemical impedance spectroscopy, Coating performance, Coating application, Marine environments, Top coats, Impedance, Seawater, Polyurethanes, Steel, Corrosion protection, Blistering
Keywords:
Ion Vapor Deposition, Epoxy, Polyurethane, Electrochemical Impedance Spectroscopy, Seawater, Steel, Aluminum
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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