Until now, mainly low-alloy steels are used as pipe materials for exploration, transportation and processing of natural gas. Natural gas may contain significant amounts of hydrogen sulfide, H2S, and/or carbon dioxide, CO2. In the presence of an aqueous phase gases containing H2S and/or CO2 are corrosive to low-alloy steels at ambient temperature. CO2 is a stronger acid than H2S. On the other hand CO2 has a lower solubility in pure water than H2S, e. g., the pH of an aqueous condensate formed in natural gas with 1 vol.% H2S and 10 vol.% CO2 is 3.25 which is only slightly lower than the pH of an aqueous condensate formed in natural gas containing only CO2.

Subject
Pits, Materials, Hydrogen concentration, Corrosion rate, Sodium chloride, Free corrosion potential, Corrosion cracking, Acidity, Sodium chloride solution, Salt concentration, Steel, Pitting, Chloride stress corrosion cracking
© 1980 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).
1980
Association for Materials Protection and Performance (AMPP)
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