Corrosion behavior of 0.5% chromium steel with or without the presence of commercial inhibitors was investigated electrochemically including EIS (Electrochemical Impedance Spectroscopy) and LPR (Linear Polarization Resistance) in an aqueous CO2 environment at different temperatures and varying wall shear stresses. For comparison, the corrosion behavior of C-1018 carbon steel was also evaluated in the same test environments. The results indicated that, under the test conditions, 0.5% chromium did not improve the corrosion resistance of C-1018 carbon steel and in fact, the corrosion rate of 0.5% chromium was higher than that of the C-1018 carbon. However, the corrosion rate of 0.5% Cr steel was effectively reduced by adding 10 ppm of the commercial corrosion inhibitors tested. The effect of shear stress on inhibitor performance was not significant at the testing shear stress ranging from 36.7 to 87.4 Pa.

Subject
Electrochemical impedance spectroscopy, Materials, Inhibitor performance, Corrosion rate, Chromium, Stress, Constants, Shear, Corrosion inhibitors, Steel, Carbon steel, Linear polarization resistance, Polarization resistance
Keywords:
0.5% Chromium Steel, CO2 Corrosion, Inhibitors, Inhibition, Electrochemical Measurements, EIS, LPR
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
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