Air Force aircraft and weapon systems are experiencing corrosion between metal surfaces including joints and related metal to metal bonds. Corrosion between metal surfaces produces structural weaknesses; and the corrosive process produces nonconductive products which destroy the nuclear-hardening capabilities and resistance to lightning strike of the structure. It was determined that dc resistance is related to shielding effectiveness although there exists a significant geometric dependence. At present, MIL-STD-5087B specifies 2.5 milliohms dc resistance where RF interference may result. The dc resistance is related directly to corrosion, and polymeric sealant materials were developed and evaluated for prevention of corrosion for up to 1000 hours of salt spray chamber exposure while maintaining the dc resistance requirement.

Subject
Materials, Metal surfaces, Aircraft, Aluminum, Joints, Metals, Sealants, Shielding, Salt spray corrosion testing, Weathering, Corrosion resistance, Stainless steel, Fasteners
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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