The present work describes the corrosion behavior of X70 pipeline steel immersed in H2S solutions. Electrochemical techniques such as Linear Polarization Resistance (LPR), Electrochemical Impedance Spectroscopy, EIS and Electrochemical Noise, EN, were used to characterize the electrochemical behavior of X70 pipeline steel in a 3 wt% NaC1 solution with several hydrogen sulfide (H2S) concentrations; 0, 100, 650 an 2550 ppm. Electrochemical Noise Measurements, ENM, have been carried out on this system in order to identify the type of corrosion. Electrochemical parameters like, Polarization Resistance, Re, corrosion rate, CR and Noise Resistance, Rn are presented. Additionally, a comparison of corrosion rate values between static and turbulent flow conditions was made. To simulate flow conditions, the rotating cylinder electrode, RCE, in turbulent flow regime (1000 rprn) for a saturated H2S solution was used.

Subject
Electric current, Steel surfaces, Iron sulfide films, Hydrogen concentration, Corrosion rate, Electrochemical noise, Iron sulfides, Pipelines, Free corrosion potential, Corrosion behavior, Film formation, Steel, Pitting
Keywords:
Pipeline steel, H2S, Electrochemical Noise, turbulent flow
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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