Corrosion studies of a 20 v/o SiCw/PM 7091 aluminum composite material were performed. The plate material which was heat treated to the T-6 and T-7 temper by conventional methods, showed preferential corrosion of the surface layers up to 2mm thick. The regions of corrosion susceptibility were determined to be due to improper processing and thermal treatments. Cold worked regions due to extrusion were not completely removed by the conventional solution treatment and thus appeared as more corrosion susceptible. Large void volume fraction and excessive segregation of SiCw was also noted.

Electrochemical, microscopic and analytical techniques were used in these investigations.

Attempts were made to remove the cold worked regions and study the resultant corrosion properties. A comparative analysis of these results is discussed.

Subject
Materials, Skin, Extrusion, Sodium chloride, Density, Sodium chloride solution, Composites, Powders, Aluminum alloys, Alloys, Solution heat treatment, Corrosion potential, Voids
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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