A progress report is presented for a program to develop a predictive corrosion model which will enable optimum inspection and maintenance scheduling for Air Force planes. The model is based on the kinetics of corrosion reactions, the degradation rates of protective coating systems and the environmental conditions existing at various Air Force bases.

Corrosion rates for 7075-T6 and 7075-T73 aluminum and 4340 and 300M steel in solutions containing varying amounts of atmospheric pollutants were determined. A procedure was developed for predicting crack growth on aircraft stationed in a variety of environments. A VAX-11 FORTRAN program is being developed to establish Analytical Condition Inspection selection and scheduling, inspection programs for new aircraft, and field and depot level inspection programs for aircraft already in operation. The computerized corrosion forecasting models and maintenance scheduling decision logic will be validated by comparing the predictions of the model with the actual corrosion histories of the C-5A and C-141 fleets.

Subject
Crack growth, Corrosion rate, Aircraft, Inspection, Coating degradation, Force, Corrosion modeling, Crack length, Corrosion data, Corrosion protection, Maintenance, Stress corrosion cracking, Types of corrosion
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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