An investigation was performed to evaluate the integrity and corrosion resistance of a new proprietary bimetallic type of oil country tubular goods (OCTG). This technology consists of internally coating of the steel tubulars with a corrosion resistant, nickel base alloy using plasma transfer arc welding. Included in the evaluation were (a) hydrogen disbonding resistance of the coating and (b) localized corrosion resistance of the coating versus a comparable wrought alloy. Test methods utilized in this study included accelerated hydrogen charging and hydrogen permeation measurements followed by metallographic examination. The resistance to localized corrosion was examined using electrochemical methods including cyclic polarization and critical pitting temperature determinations. Both types of evaluation were conducted on full section internally coated tubulars and involved simulated, highly sour field conditions.

Subject
Tubular goods, Materials, Metal surfaces, Tubes, Anode surfaces, Open circuits, Test environments, Steel, Brines, Corrosion resistance, Localized corrosion, Corrosion potential, Hydrogen
Keywords:
Dimetallic, overlay, localized corrosion, hydrogen disbonding, hydrogen sulfide, electrochemistry
© 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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