Galvanic corrosion behavior in sour and sweet well environments for combinations of materials from carbon steels to high nickel alloys was investigated by using electrochemical methods and immersion tests. Basically, the results obtained by electrochemical methods coincided with those by immersion test. The ratio of a corrosion rate of a material in coupled to that of uncoupled defined as galvanic effect index (GEI) was studied with different surface ratios. GEI increased with an increase in the weight loss of the "uncoupled specimen" and is at most 2.0 in both sweet and sour environments when a surface area ratio of anode site to cathode site was 1:1. GEI increased with increasing surface ratio but almost independent on surface ratio at temperatures more than 100 °C. Galvanic corrosion was not serious as expected from the theory.

Subject
Immersion tests, Steel surfaces, Materials, Corrosion rate, Sour environments, Anode surfaces, Weight loss, Steel, Duplex stainless steel, Galvanic current, Galvanic corrosion, Electrode potential, Low alloy steel
Keywords:
galvanic corrosion, oil country tubular goods, carbon steel, stainless steel, corrosion rate, sour gas, CO2 gas
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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