Because of their relatively high aluminum concentration, ordered alloys based on Fe3Al afford unique high-temperature oxidation properties. This paper reviews the behavior of Fe3Al-based alloys in a variety of oxidizing and sulfidizing environments that are of interest for potential service applications. The alloy is shown to afford excellent compatibility with gaseous environments consisting ofr, oxygen, H2S-H2-H2O, and SO2-O2. Effects of minor alloying additions on corrosion resistance are discussed with particular reference to the role of chromium. Also reviewed are the corrosion properties of Fe3Al alloys in the presence of salt mixtures composed of sulfates and nitrates, respectively. The alloy system is adversely affected by the presence of molten alkali sulfates, but it is relatively compatible with CaSO4 and molten alkali nitrates.

Subject
Corrosion resistant alloys, Stainless alloys, Salts, Corrosion rate, Aluminum, Chromium, Iron, Weight gain, Aluminides, Zirconium alloys, Corrosion resistance, Gases, Aluminum alloys
Keywords:
iron aluminide, oxidation, sulfidation, hot corrosion, SO2, H2S, alkali sulfate, CaSO4, molten nitrates
© 1992 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).
1992
Association for Materials Protection and Performance (AMPP)
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