Corrosion inhibitors used in crude unit applications are characterized by the need for rapid adhesion to the metal surface as well as persistent film formation. Persistent inhibitor films provide increased corrosion inhibition under all conditions, with the greatest benefit occurring during low pH excursions. The use of a dynamic film persistency test based on Linear Polarized Resistance (LPR) measurements allows for the determination of film integrity and relative rates of inhibitor desorption from the metal surface. The dynamic film persistency test also allows analysis of the consequences of pH excursions on inhibited systems.

Subject
Water, Inhibitor performance, Corrosion rate, Metal surfaces, Probes, Inhibitor films, Film persistency, Desorption, Acidity, Persistency, Chemical inhibition, Corrosion inhibitors, Linear polarization resistance
Keywords:
petroleum refining, corrosion inhibition, crude distillation units, corrosion inhibitors, linear polarized resistance, inhibitor persistency, pH excursions, desorption
© 2001 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).
2001
Association for Materials Protection and Performance (AMPP)
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