This paper presents the results and analysis of inhibitor performance of CO2 corrosion at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and SEM techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor at slug flow of Froude number 12. A metal-film-solution model is presented and its electrochemical characteristics are discussed. The electrochemical analysis is consistent with the hydrodynamic analysis that there are large inhibitor-uncovered areas on the steel surface at higher Froude number.

Subject
Films, Electrochemical impedance spectroscopy, Steel surfaces, Inhibitor performance, Inhibitor films, Slug flow, Pores, Corrosion products, Capacitance, Mass transfer, Bubbling, Film formation, Corrosion inhibitors
Keywords:
electrochemical impedance spectroscopy (EIS), charge transfer resistance, capacitance, mass transfer, bubble impact, turbulence, inhibitor film, corrosion product film
© 2002 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).
2002
Association for Materials Protection and Performance (AMPP)
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