A research method is proposed assessing the environmental conditions for corrosion initiation on the high alloy OCTG and Line Pipe in the sour well environments, and predicting the corrosion morphology of alloys in those environments. It is elucidated that two critical limits are possible to draw as an indication of the transition of the corrosion morphology on the TemperatureH2S Partial Pressure diagram: One is for the passive-active transition, and the other is the no corrosion-localized corrosion transition. These two critical limits are interpretable in terms of depassivation pH and critical pitting potential. Based on the mechanistic analysis and the experimental results, the transition of the corrosion morphology was given on the Temperature-H2S partial pressure diagram.

Subject
Materials, Corrosion resistant alloys, Sour environments, Passive films, Partial pressures, Corrosion morphology, Corrosion resistance, Localized corrosion, Risk reduction, Alloys, Critical pitting potential, Corrosion potential, Electrode potential
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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