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51318-11040-Electrochemical noise measurements with dummy cells: Evaluation of a round-robin test series

Picture for Electrochemical noise measurements with dummy cells: Evaluation of a round-robin test series
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Round-robin (RR) tests on electrochemical noise (EN) measurements with dummy cells have been performed in the European Cooperative Group on Corrosion Monitoring of Nuclear Materials since 2006.

Product Number: 51318-11040-SG
Author: Hongpeng Zheng / Yawei Shao
Publication Date: 2018
Industry: Test Method
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Round-robin (RR) tests on electrochemical noise (EN) measurements with dummy cells have been performed in the European Cooperative Group on Corrosion Monitoring of Nuclear Materials since 2006. Dummy cells are composed of three resistors of equal value connected in a ‘star’ arrangement and employed in the conventional three electrode EN measurement setup using a zero-resistance ammeter. The use of dummy cells has the advantage of measuring voltage and current signals of reproducible amplitude contrary to corroding systems. The arrangement provides a well-defined source impedance and noise level, thereby allowing the testing of noise level and sensitivity of the measuring instrument, which is a potentiostat in most cases. Although the resistors used in dummy cells generate thermal noise of a very low level, as low as for passive electrodes, it is not expected that all instruments will be able to measure this noise. From the results of the three RR tests performed between 2014 and 2017 that are presented, it may be concluded that small improvements could observed compared to the very first RR campaigns, but that still only few commercially available instruments are able to perform fully valid electrochemical noise measurements and that better guidance to the users of such instruments is needed.

 

Key Words: round-robin, electrochemical noise, dummy cell, potentiostat

Round-robin (RR) tests on electrochemical noise (EN) measurements with dummy cells have been performed in the European Cooperative Group on Corrosion Monitoring of Nuclear Materials since 2006. Dummy cells are composed of three resistors of equal value connected in a ‘star’ arrangement and employed in the conventional three electrode EN measurement setup using a zero-resistance ammeter. The use of dummy cells has the advantage of measuring voltage and current signals of reproducible amplitude contrary to corroding systems. The arrangement provides a well-defined source impedance and noise level, thereby allowing the testing of noise level and sensitivity of the measuring instrument, which is a potentiostat in most cases. Although the resistors used in dummy cells generate thermal noise of a very low level, as low as for passive electrodes, it is not expected that all instruments will be able to measure this noise. From the results of the three RR tests performed between 2014 and 2017 that are presented, it may be concluded that small improvements could observed compared to the very first RR campaigns, but that still only few commercially available instruments are able to perform fully valid electrochemical noise measurements and that better guidance to the users of such instruments is needed.

 

Key Words: round-robin, electrochemical noise, dummy cell, potentiostat

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