Flow loop experiments with low alloy carbon steel (38 Mn5/C75) in highly turbulent CO2/brine/hydrocarbon systems showed that the flow intensity and, hence, the critical flow intensity for flow induced localized corrosion (FILC) can be described in terms of critical wall shear stresses. Critical values for n-octadecylamine ranged in the order of 100-150 N/m2, and were above 500 N/m2 for n-octadecenyl succinic anhydride and two commerical CO2 corrosion inhibitors with new chemistry. Even at a liquid flow rate of 23 m/s a target corrosion rate of 0.1 mm/a could be reached if the right concentration of these highly flow resistant inhibitors was chosen. The kinetics of the formation of nonuniform corrosion (FILC) can be monitored online by measuring the change of pressure drop at a test pipe section.

Subject
Inhibitor performance, Hydrogen concentration, Corrosion rate, Turbulent flow, Wall shear stress, Mixtures, Stress, Corrosion attacks, Shear, Pressure, Pipe sections, Corrosion inhibitors, Corrosion protection
Keywords:
carbon dioxide corrosion, low alloy steel, brine/hydrocarbon systems, flow effects, inhibitors, erosion corrosion, localized corrosion, wall shear stress
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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