Multielectrode Array Sensors to Enable Long-Duration Corrosion Monitoring and Control of Concentrating Solar Power Systems

Guo, Jicheng; Hoyt, Nathaniel C.; Williamson, Mark A.

doi:10.1016/j.jelechem.2021.115064

Multielectrode Array Sensors to Enable Long-Duration Corrosion Monitoring and Control of Concentrating Solar Power Systems

Journal Article · Mon Mar 01 04:00:00 EST 2021 · Journal of Electroanalytical Chemistry

DOI:https://doi.org/10.1016/j.jelechem.2021.115064· OSTI ID:1798300

Guo, Jicheng; Hoyt, Nathaniel C.; Williamson, Mark A.

Molten mixtures of MgCl2-KCl-NaCl are promising heat transfer fluid (HTF) candidates for the next generation of concentrating solar power systems (Gen3 CSP), because of their low cost, high decomposition temperature, and favorable heat transfer characteristics. However, if the chemistry of the salts is not properly controlled, molten chlorides can cause corrosion of high-temperature metal alloys, such as Inconel (R), in CSP systems. Here we demonstrate a corrosion monitoring system that can be used to monitor the health of the structural alloys over long durations. The monitoring system includes a multielectrode array voltammetry sensor that measures the redox potential of molten MgCl2-KCl-NaCl mixture as well as the presence of corrosion products and impurities. The sensors have been successfully operated in static molten salt environments for long durations, and are capable of detecting corrosion products, such as Cr2+ and Fe2+, quantitatively at low concentrations (i.e., approximately 100 ppm) with less than 4% error.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Solar Energy Technologies (SETO)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1798300

Journal Information:: Journal of Electroanalytical Chemistry, Journal Name: Journal of Electroanalytical Chemistry Vol. 884; ISSN 1572-6657

Country of Publication:: United States

Language:: English

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Multielectrode Array Sensors to Enable Long-Duration Corrosion Monitoring and Control of Concentrating Solar Power Systems

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