Boiler steel tubes in Mexican electric power plants are reported to be highly sensitive to high temperature corrosion enhanced by liquid phase fuel oil ash deposits. The combustion of fuel oils with high asphaltene and other vanadium and sulphur rich-compounds produces ash deposits on tube surfaces. This paper is devoted to a study of the influence of nine fuel oil ash deposits with V/(Na+S) atomic ratios ranging from 0.68 to 47.3, on the high temperature corrosion of tube stainless steels 304H, 321H, 316H, 347H, 310 and 446 and low and medium chromium steels T11, T22 and T9. The steel surfaces were exposed to the ash deposits at temperatures ranging between 440C and 650C. The deposits and the exposed surfaces were characterized employing conventional chemical analysis, x ray diffraction, SEM and x ray microanalysis.

Subject
Sulfur, Composition, Corrosion rate, Tubes, Vanadium, Melting point, Sodium, Steel, Ash, Boilers, Deposit corrosion, Stainless steel, Oil
Keywords:
corrosion, high temperature, oil ash, boilers, deposits, fuel oil, stainless steels, superheater tubes, reheater tubes, vanadium corrosion
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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