Lack of knowledge of the formation of corrosion films, their chemical nature, and protecting properties prevents reliable predictions of the CO2 corrosivity of gas - condensate - and oil wells. In long transport pipes the water phase accumulates increasing amounts of Fe2+ corrosion product during the travel. As the Fe2+ concentration has a major influence on CO2 corrosion, exposure facilities enabling controlled variations of the Fe2+ concentration have been used. The influence of en-vironmental variables on film formation have been studied. Three different types of corrosion films were detected. The nature of the films, their ability to slow down the corrosion rate, their electrochemical breakdown and the localized attack resulting from the film breakdown have been investigated.

Subject
Films, Water, Corrosion rate, Sodium chloride, Free corrosion potential, Partial pressures, Acidity, Corrosion products, Corrosion attacks, Film formation, Steel, Carbon steel, Corrosion protection
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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