Few materials have satisfactory general corrosion resistance for use in concentrated nitric acid at elevated temperatures. The stainless steels and some nickel-base alloys perform adequately at room temperature but are rapidly attacked when temperatures exceed 40 C (1, 2, 3). The heat affected zones of welds of unstabilized steels are particularly susceptible to localized attack in the as-welded condition (2). The aluminum alloys have better corrosion resistance than the stainless steels to concentrated nitric acid (greater than 95 percent) (2) but are also susceptible to attack of the heat affected zone in fuming nitric acid above 50 C (4) and are rapidly attacked by nitric acid at concentrations less than 95 percent (5).
© 1980 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).
1980
Association for Materials Protection and Performance (AMPP)
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