A setup for electrochemical corrosion testing at elevated temperature and pressure

Embargoed until 2022-01-23
Date
2020-04Type
- Journal Article
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Abstract
Laboratory corrosion and scaling testing of metallic materials exposed in high temperature and pressure environments generally involves complex, multi-instrument measurement setups. Here, we present a setup including an autoclave that is instrumented for in-situ electrochemical testing and that contains a ZrO2-based solid-state pH electrode and devices for temperature control and solution stirring. We show results highlighting the importance of adequate pre-calibration of the pH measurement, due to the hysteresis depending on temperature sweep. Additionally, we illustrate how interfacing the autoclave and the electrochemical cell to measuring and controlling instruments, using different data communication interfaces, can create ground loops. These ground loop interferences can introduce significant errors in the measurement, such as a potential shift of >100 mV. In complex, multi-instrument setups, a complete understanding of ground loops may often be difficult. Thus, we recommend systematic checks to identify the ground loops and we propose measures to avoid them. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000397721Publication status
publishedExternal links
Journal / series
MeasurementVolume
Pages / Article No.
Publisher
Elsevier BVSubject
Autoclave; Corrosion; pH electrode; Data communication interface; Potentiostat; Ground loopOrganisational unit
09593 - Angst, Ueli / Angst, Ueli
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Citations
Cited null times in
Web of Science
Cited 1 times in
Scopus
ETH Bibliography
yes
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