Corrosion in a low-level radio-active waste incinerator off-gas system at the Department of Energy's Savannah River Plant is discussed. Severe corrosive attack and failure of an Alloy 600 part exposed to high-temperature (>1000°C) gases was observed. Rapid attack of carbon steel components, and cracking of austenitic stainless steel parts also occurred at locations where lower gas temperatures and periodic condensate exposure occurred. Investigation showed HCl, SO2, SO3 and phosphorus oxides were present and contributed to the failures. Mechanisms of high-temperature failure include alloy separation and reactions with phosphorus. Coupons placed in the incinerator discharge stream have provided information for selection of future materials of construction for the high-temperature system components. Several nickel- and iron-base alloys and a stainless steel with an aluminum diffusion coating were investigated.

Subject
New alloys, Materials, Stainless alloys, Metal surfaces, Nickel based alloys, Phosphorus, Incinerators, Towers, Corrosion resistance, Gases, Stainless steel, Alloys, Wastes
© 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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