Using submerged jet impingement experiments critical wall shear stresses for initiation of flow induced localized corrosion (FILC) were evaluated for the system carbon steel/aqueous polysulfide containing monoethylamine (MEA) solutions/H2S (22 to 42 bar). Due to an extraordinary MEA concentration effect the critical wall shear stress at 130 °C was about 90 N/m2 in 2.4 M MEA, but only 2N/m2 in 5 M MEA solution. Inhibition could increase this low value to 17 N/m2. Wall shear stresses up to 53 N/m2 could be reached by precorrosion under subcritical flow conditions and use of an inhibitor yielding sulfide scales with significantly enhanced FILC resistance. The change in FILC susceptibility is accompanied by a change in scale morphology and thickness. In order to quantify erosion corrosion intensities developed by a submerged jet stream, surface roughness profiles were correlated via frequency analysis with wall shear stress related dimensions of impact transferring volume elements of eddies in the hydrodynamic boundary layer.

Subject
Corrosion rate, Sulfide films, Flow velocity, Walls, Wall shear stress, Roughness, Corrosion initiation, Corrosion scales, Polysulfides, Corrosion inhibitors, Sulfide scale, Corrosion protection, Corrosion coupons
Keywords:
carbon steel, jet impingement, erosion corrosion, wall shear stress, monoethylamine, polysulfide, hydrogen sulfide, inhibitor, surface roughness, hydrodynamic boundary layer
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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