Various environmental factors affect the behavior of CO2 corrosion of carbon steel by changing properties of the corrosion products layer. In order to clarify the CO2 corrosion mechanism, the influence of Cl−, partial pressure of CO2 and purity of iron on the behavior of corrosion product is investigated in autoclave. The CO2 corrosion mechanism including initiation of mesa corrosion in two phase flow is analysed, where freshly condensed water plays an important role and makes the corrosive environment more severe to carbon steel. 9Cr, 13Cr and 25Cr steels are resistant even in two phase flow with high flow velocity of 26 m/s. Considering the application of 9Cr-1Mo and AISI type (13Cr) martensitic steels and 22-25Cr duplex phase stainless steel to critical CO2 wells, corrosion behaviors of those steel are investigated in CO2-Cl− solution slightly contaminated with H2S. Specifically, the effects of temperature and partial pressure of H2S on SCC and localized corrosion are discussed.

Subject
Water, Piping, Corrosion rate, Autoclaves, Protective films, Sodium chloride, Iron, Partial pressures, Condensed water, Corrosion products, Film formation, Steel, Stress corrosion cracking
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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