The passive behavior of 13% Cr steel and 22% Cr duplex steel was determined by solution ion analysis. Both metals exhibited passive behavior in a simulated production brine before and after exposure to hydrochloric acid.

A sample of 22% Cr duplex steel repassivated in a low pH, high chloride fluid under a CO2 atmosphere following exposure to inhibited 15% HCl. Martensitic 13% Cr also showed passive behavior following exposure to acid in a low pH fluid or one containing a high chloride content. However, anomalies in the passive nature of 13% Cr occurred in a fluid containing both a low pH and a high chloride content.

Subject
Acids, Test methods, Chromium, Oxide layers, Sodium chloride, Iron, Sodium chloride solution, Ion concentrations, Fluids, Metals, Steel, Brines, Acetic acid
Keywords:
passivation, hydrochloric acid, brine, carbon dioxide, 13% Cr, 22% Cr duplex, acetic acid, and corrosion
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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