The superior corrosion resistance of 12 percent chromium, martensitic stainless steels over that of low alloy steels, makes them of interest for gas and oil production applications. A major limitation to the use of 12 percent Cr steels is their susceptibility to environmental cracking and localized corrosion in the presence of hydrogen sulfide. In this study, the corrosion and environmental cracking behaviors of a 12Cr-3.5Ni alloy have been evaluated in simulated down hole sour gas environments at 27, 82, and 149 C. Electrochemical polarization and slow strain rate tests were used to investigate the corrosion and cracking behaviors as a function of pH, CO2, and H2S concentrations. The results are in general agreement with other laboratories and service experience.

Subject
Marine environments, Nickel based alloys, Sodium chloride, Acidity, Polarization curves, Sea salt, Brines, Pitting, Gases, Polarization, Alloys, Protection potential, Corrosion potential
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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