Localized, rather than uniform corrosion, is the principal cause of failure by CO2 corrosion. Flow-loop experiments were conducted to determine the effect of fatty acids present in many oil and gas production streams on the pitting corrosion of carbon steel in air-free CO2 systems. Independent of pH, increase in acidity and in buffer capacity of the solution adjacent to the metal surface was found to decrease the depth of the pits.

Subject
Acids, Pits, Water, Acid concentration, Corrosion rate, Weak acids, Partial pressures, Acidity, Corrosion products, Sodium chloride solution, Film formation, Steel, Pitting
Keywords:
CO2 corrosion, fatty acids, buffer capacity
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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