Several new corrosion resistant bolting alloys have been recently added to the collection already available to the airframe manufacturer.(1) In environments where stress corrosion cracking has been a threat with alloy steels, the new alloys are very resistant, even at strength levels of 220,000 and 260,000 psi. Because these alloys are usually mated with aluminum, their nobility in the galvanic series indicates the danger of severe attack of the more active structure. Salt spray tests substantiate the theory(2) as shown in Figure 1, but do not accurately reproduce the milder conditions often experienced in the field. Static tests in urban and suburban environments demonstrate that corrosion of the aluminum does occur, but can be prevented or reduced by the use of coatings on the corrosion resistant alloy fasteners.(3,4) This is shown in Figure 2.

Subject
Steel structures, New alloys, Coating application, Corrosion resistant alloys, Nickel based alloys, Aluminum, Molybdenum alloys, Mechanical failure, Corrosion protection, Corrosion resistance, Fasteners, Aluminum alloys, Barrier coatings
© 1973 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).
1973
Association for Materials Protection and Performance (AMPP)
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