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Communication Dans Un Congrès Année : 2018

Electrochemical noise measurements with dummy cells : evaluation of a round-robin test series

Stefan Ritter
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Résumé

Round-robin tests on electrochemical noise measurements with dummy cells have been performed in the European Cooperative Group on Corrosion Monitoring of Nuclear Materials (ECG-COMON, www.ecg-comon.org) since 2006. Dummy cells are composed 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. Using dummy cells has the advantage of measuring voltage and current noise signals of reproducible amplitude contrary to corroding systems. The arrangement provides a well-defined source impedance and noise level, thereby allowing the testing of the noise level and sensitivity of the measuring instrument, which is a potentiostat in most cases. Although the resistors used in the dummy cell generate thermal noise of low level, as low as for passivated electrodes, it is not expected that all instruments will be able to measure this noise, and the objective of the experiment is also to determine the instrument noise levels. From the results of the three round-robin tests performed between 2014 and 2017 that will be presented, it may be concluded that small improvements could be observed compared to the very first round-robin campaigns, but that still only very few commercially available instruments are able to perform fully valid electrochemical noise measurements. Presenting Author Info: Full Name: Huet, Francois Parent Company: University Paris 6 Email: francois.huet@upmc.fr Secondary authors: Full Name: Ritter, Stefan Parent Company: Paul Scherrer Institute (PSI) Email: stefan.ritter@psi.ch
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Dates et versions

hal-03976581 , version 1 (07-02-2023)

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  • HAL Id : hal-03976581 , version 1

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François Huet, Stefan Ritter. Electrochemical noise measurements with dummy cells : evaluation of a round-robin test series. Corrosion Nace 2018, NACE International, Apr 2018, Phoenix Arizona, United States. paper 11040. ⟨hal-03976581⟩
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