Stress corrosion in a sulfide environment of low alloy steels used in large steam turbine generators has been previously reported.1  In fact, this kind of sulfide stress corrosion takes place in an alkaline environment owing to the feed water treatment of boilers which supply the steam for these turbine generators. Sulfides (resulting from decomposition of SO3=), sodium salts, hydroxides and phosphates are carried over to the turbine at high temperature and pressure. As the steam expands through the turbine, it can be shown that solutions of caustic and/or sulfides can have a partial pressure of water which is in equilibrium with the pressure of the superheated steam. Thus concentrated solutions of caustic or sulfide can exist in superheated sections.

Subject
Embrittlement, Electrochemical cells, Microstructure, Wiring, Experimental data, Mechanical failure, Pearlite, Electric potential, Sulfides, Heat treatment, Rest potential, Hydrogen, Martensite
© 1970 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).
1970
Association for Materials Protection and Performance (AMPP)
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