The effects of alloying elements such as Cu, Ni and Cr on CO2 corrosion of the low C-Mn-Nb type API X65 grade steel were investigated with the use of a rotary immersion tester at temperatures of less than 90°C. The corrosion rate of the steel increased with the addition of Cu, while it decreased with the increase in Cr content. In a high pH environment, i.e. pH=6 and in a high temperature condition, i.e. 80 °C, Cu and Ni accelerated the occurrence of mesa attack. However the occurrence of mesa attack was prevented with the addition of Cr which concentrateds in the scale. The mesa attack did not occur in the steel containing Cr and Cu.

The linepipe steel with Cr content of 0.5mass% proved to have excellent properties even in a wet CO2 environment.

Subject
Films, Corrosion prevention, Steel surfaces, Corrosion rate, Protective films, Corrosion testing, Polarization curves, Corrosion attacks, Corrosion scales, Steel, Carbon steel, Immersion, Corrosion protection
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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