One significant factor in the degradation of pipelines used for oil and gas production is internal pitting corrosion. The penetration of the pipe wall by pits is a process that consists of three stages: formation of a passive layer on the steel surface; initiation of pits at localized regions on the steel surface where film breakdown occurs; and pit propagation and eventual penetration of the pipe wall. Electrochemical reactions are involved in all three stages. As a result, each stage of pitting corrosion can be modelled based on electrochemical principles. This paper reviews the merits and demerits of 35 electrochemical-science models.

Subject
Pits, Metal surfaces, Passive films, Oxide layers, Nucleation, Dissolution, Crevices, Ion concentrations, Interfaces, Corrosion modeling, Metals, Pitting, Cations
© 2005 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).
2005
Association for Materials Protection and Performance (AMPP)
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