Localised corrosion is the principal cause of line failure when corrosion is internal. As the inhibition is the most common way to control corrosion in wet gas and oil production lines, the inhibitor should be able to control localised corrosion in all cases where it may occur. Therefore, Inhibitor selection philosophy should be based on this approach. Laboratory and field evaluation of corrosion inhibitors showed that some products are almost 100% efficient in preventing localised corrosion if their concentration in the water phase is above a threshold value. The main uncertainty, which then remains, is the inhibitor availability at the pipe surface.

Subject
Corrosion prevention, Pipe surfaces, Water, Corrosion rate, Metal surfaces, Corrosion initiation, Solubility, Chemical inhibition, Inhibition efficiency, Corrosion inhibitors, Corrosion protection, Electrodes, Oil
Keywords:
localised CO2 corrosion, inhibitor testing, corrosion control, wet gas lines
© 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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