Coal-ash corrosion is one of the major hurdles to be overcome if the improved coal-fired power plant is to succeed. This paper describes the major variables affecting coal-ash corrosion and provides laboratory corrosion data generated with various levels of SO2 and alkali sulfates. The corrosion rate increases as SO2 and alkali-sulfate concentration increase. As previously observed, the corrosion rate experiences a bell-shaped curve with respect to temperature (i.e., increases with rising temperature to a maximum and then decreases). The work that is the subject of this paper showed that the bell-shaped curve shifts to a higher temperature than previously reported and varies with different alloys. The valuable isocorrosion curve was developed to provide a means of predicting the corrosion rate for various SO2, alkali-sulfate, and temperature combinations.

Subject
Materials, Corrosion resistant alloys, Corrosion rate, Tubes, Sulfates, Flue gas, Corrosion losses, Weight loss, Ash, Corrosion probes, Coal, Deposit corrosion, Alloys
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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