07369 Analysis of Electrochemical Noise Data for the Determination of Different Reactions

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Product Number: 51300-07369-SG

ISBN: 07369 2007 CP

Author: Marco Bierwirth, Joachim Goellner, and Andreas Heyn

Publication Date: 2007

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Electrochemical noise changes the point of view in corrosion research with deeper insights into the elementary courses of corrosion processes. The noise represents itself in a variety of forms. Most applications are related to the initiation of pitting on high-alloyed chromium-nickelsteels. The noise signals contain much information about these processes. This paper is specially devoted to the question, which information is contained in one single event of the electrochemical noise. In the first step, a theoretical model was developed which describes the reactions taking place in the course of such a single event as electron currents. A separate current source is described for the anodic dissolution as well as for the electron consuming cathodic reaction. The theoretical reflections about the connection between the elementary currents and the thereby caused potential fluctuations are discussed in the data analysis of a real potential noise measurement on a high alloyed steel specimen. A special algorithm is used for the data analysis taking into consideration the transfer characteristics of the measurement amplifier. The inversion of the transfer function is applied to the recorded time-domain signal, before the reconstructed signal is analyzed by the model described in this paper. The intention of the model is to show how the practical measurable sum current is composed of the parts of the anodic metal dissolution and the cathodic reaction. The aim of these investigations being still in progress finally is the discrimination between the anodic and cathodic processes.