It was demonstrated that 7075-T6 and 2024-T3 aluminum treated in dilute, relatively non-toxic trivalent chromium bath have achieved salt spray corrosion resistance and paint adhesion equivalent to that of chromate conversion coatings. The trivalent chromium bath has less tendency for inducing hydrogen embrittlement of high strength steel than a chromating (Cr+6) bath. Color coatings were successfully produced by addition of dyes to the trivalent chromium solution.

Subject
Self-healing, Brushing, Aluminum, Chromium, Sulfates, Peroxide, Salt spray corrosion testing, Immersion, Coating defects, Corrosion resistance, Deposit corrosion, Aluminum alloys, Paints
Keywords:
conversion coating, trivalent chromium, low or non-toxic (environmentally friendly), aluminum alloys, corrosion resistance, paint adhesion, salt spray testing, Alodine 1200 (Cr+6), chrmoate conversion coating alternative
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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