Corrosion resistant alloys have been used for many years to withstand the severely corrosive environments created by wet lime/limestone flue gas desulfurization (FGD) systems. While the limitations of the frequently used alloys are generally understood from experience, unusual failures continue to occur. Results of investigations of unusual failures of corrosion resistant alloys in four FGD systems are reported. These include a very unusual "pitting” and wastage of Alloy C-22 in a direct-bypass mixing zone, side-by-side severe corrosion of Alloys C-22 and C-276 in a direct-bypass mixing zone, severe wastage of Type 316L stainless steel in a low chloride scrubber, and thiosulfate-accelerated chloride-induced pitting of Type 316L stainless steel.

Subject
Corrosion resistant alloys, Stainless alloys, Metal surfaces, Nickel based alloys, Molybdenum alloys, Flue gas desulfurization, Walls, Thiosulfate, Pitting, Deposit corrosion, Stainless steel, Alloys, Chlorides
Keywords:
acid condensate, air pollution control, chloride, clean air act amendments, corrosion, corrosion-resistant alloy, environmental, flue gas desulfurization, FGD, lime
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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