In the prevention of corrosion problems in sweet gas production and transport, the use of corrosion-resistant alloys (CRAs) may be considered an alternative for (or an addition to) a carbon steel/inhibitor system. Because of the absence of oxygen in sweet gas environments the selection of the most suitable material requires test criteria and methods that are different from those related to the use of CRAs in oxygen-containing aqueous solutions. For instance, FeCl3 test results and critical pitting potentials, which are often taken as criteria for selecting CRAs for seawater applications, are not suitable for assessment of the same alloy for production fluids. Electrochemical test methods, in particular zero-resistance ammeter measurements, turned out to be very helpful in defining evaluation criteria and in quantifying various aspects (e.g. crevice corrosion, galvanic effects) that have to be considered when materials such as duplex stainless steel and 13 % Cr steel are to be used in high-chloride production media.

Subject
Acids, Galvanic anodes, Anode potential, Corrosion initiation, Galvanic cathodes, Aqueous solutions, Acidity, Crevice corrosion, Steel, Duplex stainless steel, Localized corrosion, Stainless steel, Breakdown 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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