Laboratory qualification of corrosion inhibitors for oilfield applications is a multistage process consisting of a suite of performance and compatibility tests mimicking the field conditions as closely as possible. The final and often decisive step in this sequence is typically a longer-term test focusing on the performance of corrosion inhibitor candidates against localized corrosion. Despite its fundamental importance in the decision-making process, there is currently no consensus in the industry about the definition of localized corrosion and the pass/fail criteria for tested inhibitors. This paper provides a brief summary of the different views and opinions about this subject currently adopted by various producers, chemical vendors and independent third- party labs with an emphasis on the potential relationship between surface characteristics of corrosion samples and initiation and propagation of localized corrosion.

Subject
Surface finishing, Pits, Metal surfaces, Roughness, Corrosion initiation, Beads, Surfaces, Corrosion inhibitors, Pitting, Surface profile, Corrosion coupons, Localized corrosion, Steel grit
Keywords:
Localized corrosion, surface preparation, pit initiation, profilometry
© 2020 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).
2020
Association for Materials Protection and Performance (AMPP)
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