UNS C69100, a 'yellow metal', copper-based alloy, is used extensively in the European Oil and Gas Industry. The work reported herein was designed to assess the susceptibility of the material to sour environments, in terms of general corrosion and cracking.

A series of sour environmental tests was conducted at ambient temperature and at elevated temperature and pressure. The ambient temperature tests indicated high resistance to sulphide stress corrosion cracking (SSCC). Additionally, tests including free sulphur exhibited no evidence of cracking. The high temperature and pressure tests also showed no tendency to SSCC.

The corrosion rate tests at ambient temperature indicated corrosion rates well below those of carbon steel tested in an identical environment. Hydrogen permeation measurements confirmed the corrosion rate measurements.

This alloy should be considered for sour service use. Further work will be undertaken to confirm the high temperature properties.

Subject
Marine environments, Materials, Hydrogen permeation, Electrochemical cells, Ambient air temperature, Corrosion resistant alloys, Corrosion rate, Mechanical failure, Corrosion data, Maritime, Carbon steel, Corrosion resistance, Alloys
Keywords:
Sour service, SSCC, UNS C69100, Hydrogen Sulphide, Hydrogen Permeation
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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