The Direct Methanation process for reacting equimolar concentrations of hydrogen and carbon monoxide to form methane and carbon dioxide in the presence of sulfur compounds will produce a highly corrosive environment. Equilibrium sulfur and oxygen partial pressures of 0.05-0.1 Pa (0.5-1.0 x 10−6 atm) and 1.2-2.5 x 10−17 Pa (1.2-2.5 x 10 22 atm), respectively, at 648°C (1200°F) have been calculated. The corrosion behavior of a range of commercial alloys and selected weldments, tested in this environment, is presented. Both gravimetric and sound metal loss measurements are reported to show the relative ranking of heatresistant alloys. Results are discussed using kinetics, thermodynamics, and SEM analysis.

Subject
Sulfur, Metal surfaces, Nickel based alloys, Oxide formation, Chromium, Weldments, Effluent, Metal loss, Corrosion scales, Oxide scales, Scale formation, Sulfides, Alloys
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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