A chemical system called DNBM (a mixture of quaternary ammonium salts of dichromate, nitrate, borate and molybdate) was developed to inhibit corrosion fatigue and stress corrosion cracking, as well as general corrosion, in high strength steels and Aluminum alloys. In this study, DNBM in neat Compound form was examined as a possible substitute inhibitor in standard epoxy primer coatings. The DNBM was added into a very basic epoxy coating consisting of only one relatively inert pigment and also into a clear, resin-only system in order to determine it's isolated performance. The tests were run on 2024-T3 chromate conversion coated aluminum, bare steel, and zinc phosphated steel. Electrochemical Impedance Spectroscopy measurements were made along with salt spray and humidity exposure testing. Tests results showed that the DNBM definitely added a corrosion inhibiting effect without compromising the functional properties of the coatings.

Subject
Steel panels, Test methods, Coatings, Aluminum, Titanium oxide, Pores, Epoxy coatings, Corrosion inhibitors, Salt spray corrosion testing, Rust, Blistering, Lifting, Paints
Keywords:
inhibitor, DNBM, epoxy primer, electrochemical impedance spectroscopy, salt spray exposure, humidity exposure
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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