Abstract
High-temperature oxidation tests were conducted on three commercial carbon steels in simulated combustion environments of natural gas with 99% theoretical air at a total pressure of 1 atm. It was found that 0.2 and 40 ppm sulfur contamination in the environments tended to accelerate the rate of scaling at 1200°C, but slowed it at 1100°C. At 1100°C, the sulfur was thought to adsorb on the scale surface, blocking the surface mobility and hence partly blocking the access of oxidant molecules to the surface. However at 1200°C, it was apparent that the retarding effect of the adsorbed sulfur on the scale surface was lost, and instead surface mobilities were enhanced. The oxidation kinetics and mechanisms for the observed results are discussed.
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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