Mechanisms of Localized Corrosion and Electrochemical Methods (TEG 407X) Electrochemical noise - Guidance for improving measurements and data analysis (C2018 - 11042) - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Mechanisms of Localized Corrosion and Electrochemical Methods (TEG 407X) Electrochemical noise - Guidance for improving measurements and data analysis (C2018 - 11042)

Résumé

From the results of the three Round-Robin tests on electrochemical noise (EN) measurements with dummy cells performed between 2014 and 2017 by the European Cooperative Group on Corrosion Monitoring of Nuclear Materials (ECG-COMON, www.ecg-comon.org), it can be concluded that only very few commercial potentiostats are able to perform valid noise measurements. A training course lasting two days was created and held several times in our laboratory in Paris, France, to provide the minimum knowledge for EN measurements, including the necessary validation of the measured signals by calculation of the power spectral densities of the signals at different sampling frequencies. Two practical works are performed with a Gamry Ref600 potentiostat with ESA410 software. The first one is devoted to the measurement of the thermal noise of three resistors of equal value connected in a ‘star’ arrangement and used in the conventional three electrode EN measurement setup using a zero-resistance ammeter (ZRA). This allows the instrumental noise of the ZRA to be determined. The second practical work concerns pitting corrosion of two identical aluminum electrodes in potassium chloride to show that the noise impedance is equal to the modulus of the impedance of the electrodes. A bias voltage is then applied between the electrodes to obtain one anode and one cathode to show the difficulty of analyzing the measured EN in asymmetric systems. Presenting Author Info: Full Name: Huet, Francois Parent Company: University Paris 6 Email: francois.huet@upmc.fr Business Phone: 33144274148 Secondary authors: Full Name: Ngo, Kieu Parent Company: University Paris 6 Email: kieu.ngo@upmc.fr Business Phone: 33144279617
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hal-03976591 , version 1 (07-02-2023)

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  • HAL Id : hal-03976591 , version 1

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François Huet, Kieu Ngo. Mechanisms of Localized Corrosion and Electrochemical Methods (TEG 407X) Electrochemical noise - Guidance for improving measurements and data analysis (C2018 - 11042). Corrosion Nace 2018, NACE International, Apr 2018, Phoenix Arizona, United States. ⟨hal-03976591⟩
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