Electrochemical Noise (EN) measurements for API X52 pipeline steel samples were carried out in 3.5% NaCl aqueous solution and aqueous solution containing NaCl, CaCl2 and MgCl2 (specification NACE 1D196). Both testing environments were saturated with hydrogen sulfide (H2S) at 20 and 60°C, under static conditions. EN data is analyzed in the time and frequency domains. Parameter such as Electrochemical Noise Resistance (Rn) and Localization Index were determined from the analysis in the time domain. The current and potential Power Spectrum Density (PSD) were calculated with the Maximum Entropy Method (MEM) in order to obtain the Electrochemical Noise Impedance (Zn) spectra. These are presented and correlated with traditional Electrochemical Impedance spectra. Also, Rn results are compared with traditional Polarization Resistance (Rp) data. A good correlation was observed among the used techniques and relevant electrochemical data related to the corrosion phenomena was obtained.

Subject
Electrochemical impedance spectroscopy, Correlation, Electrochemical noise, Sodium chloride, Impedance, Pipelines, Sodium chloride solution, Electrochemical current, Experimental data, Electrochemical data, Steel, Brines, Linear polarization resistance
Keywords:
electrochemical noise, API X52 pipeline steel, hydrogen sulfide, flow, electrochemistry
© 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)
You do not currently have access to this content.