A field usable trivalent chromium conversion coating process for aluminum alloys was developed. A concentrate formulation was developed that can be mixed in the field and is ready for immediate use. The conversion coatings impart excellent paint adhesion and corrosion protection to A12024-T3 and A17075-T6. Surface analysis reveals the conversion coating to consist of a mixture zirconium and chromium oxide species. Toxicological testing has confirmed that the trivalent conversion coating materials are much more benign than chromate (hexavalent chromium) conversion coating materials.

Subject
Test methods, Water, Coatings, Materials, Aircraft, Chromium, Zirconium, Coating adhesion, Salt spray corrosion testing, Immersion, Corrosion protection, Aluminum alloys, Chemical conversion coatings
Keywords:
trivalent chromium, conversion coating, aluminum alloy pretreatment, aircraft materials, corrosion resistance, paint adhesion
© 2000 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).
2000
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.