Abstract
Electrochemical noise (EN) is a technique that allows the estimation of both the rate and the corrosion mechanism of different metallic alloys by means of the measurement and the analysis of the fluctuations of current and voltage. Its main advantage against other electrochemical techniques is that during the measurement process, the corrosive systems under study are not instrumentally disturbed, and therefore, the systems are kept at their natural corrosion potential. Two steps are necessary to use this technique: measurement and analysis of the EN signals. In this paper, the most important concepts related only to the measurement of EN are revised. The parameters most employed in the literature to analyse the EN signals will be described in another paper. In the present article, the experimental devices normally used to measure EN signals are firstly analysed. Subsequently, the most important properties of the EN signals are studied. Finally, the external sources of instrumental noise that can affect to the EN signals are described.
Highlights
El ruido electroquímico es una técnica que permite estimar la velocidad y los mecanismos de corrosión de aleaciones metálicas mediante la medida y análisis de las fluctuaciones de corriente y potencial
Its main advantage against other electrochemical techniques is that during the measurement process, the corrosive systems under study are not instrumentally disturbed, and the systems are kept at their natural corrosion potential
The parameters most employed in the literature to analyse the Electrochemical noise (EN) signals will be described in another paper
Summary
El ruido electroquímico es la técnica que estudia las fluctuaciones de las señales de potencial (E) y de corriente (I) que se generan cuando un metal se corroe en un medio corrosivo. Esta configuración presenta la gran ventaja de no perturbar externamente el sistema, por lo que se puede afirmar que las señales de EN obtenidas se deben a la corrosión espontánea del sistema. El electrodo de referencia empleado para la medida del potencial, puede ser un electrodo de referencia real o un electrodo de la misma naturaleza que los electrodos WE1 y WE2 [1 y 22]. Esto implica que el ruido de potencial medido será la diferencia de potencial entre los electrodos de trabajo (WE1 y WE2) y el tercer electrodo (RE). Esta disposición se suele utilizar cuando no existen electrodos de referencia comerciales que resistan las condiciones de trabajo como, por ejemplo, altas temperaturas o altas presiones[30 y 31]. Esto no constituye un gran problema ya que la información más interesante suele encontrarse en las flucσtEu, aTecrmio=ne4skdTeRl bpotencial, más que en su valor medio
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