Rotating cylinder experiments have demonstrated significant corrosion rates of steel exposed to oxygenated, hydrogen sulfide and ammonia containing aqueous solutions to be dependent on pH, presence of oxygen, hydrogen sulfide concentration and flow. Corrosion is more severe than expected basis a review of published reports (considering systems at relatively low ammonium hydrosulfide concentrations and above a pH of 6[1-10]). In particular, the dependence of carbon steel corrosion rates on pH and the impact of oxygen in this system can be strong, but only under conditions prior to reaction between H2S and O2. The influence of the hydrogen sulfide concentration is unexpected in that neutral, 1mM solutions are more corrosive than neutral, 10mM solutions in both short-term tests and on a sustained basis.

Subject
Hydrogen sulfide, Films, Thin films, Cylinders, Hydrogen concentration, Corrosion rate, Sulfide films, Aqueous solutions, Corrosion scales, Sulfide concentration, Film formation, Oxygen, Chlorides
Keywords:
general corrosion, hydrogen sulfide, ammonia, oxygen, carbon steel, flow, absence of polysulfide, pH dependence
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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