The coatings industry has had to address environmental concerns related to VOC’s and heavy metals. As a result of regulations or pending regulations, accelerated development of environmentally friendly coatings has created the need for improved tools for characterization of coating degradation, design of experiments, and aging of coatings. In this presentation, we report the results of a study which used statistical design of experiments, electrochemical techniques, and accelerated environmental tests to evaluate commercially available non-chromate inhibitors in a waterborne acrylic coating on steel panels. We looked for correlation between: DC electrochemical measurements of inhibitors in solution, AC impedance tests of coated panels, salt spray, Prohesiontr, and Southern Florida outdoor exposures. Performance of the individual inhibitors, and mixtures were compared to chromate control coatings.

Subject
Zinc rich coatings, Coatings, Materials, Inhibitor performance, Prohesion, Correlation, Impedance, Mixtures, Corrosion inhibitors, Salt spray corrosion testing, Coating formulation, Immersion, Zinc
Keywords:
coatings, accelerated test methods, inhibitors, chromate alternatives, impedance, electrochemistry
© 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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