Corrosion of Ferritic Steels in High Temperature Molten Salt Coolants for Nuclear Applications
Abstract
Corrosion of ferritic steels in high temperature molten fluoride salts may limit the life of advanced reactors, including some hybrid systems that are now under consideration. In some cases, the steel may be protected through galvanic coupling with other less noble materials with special neutronic properties such a beryllium. This paper reports the development of a model for predicting corrosion rates for various ferritic steels, with and without oxide dispersion strengthening, in FLiBe (Li{sub 2}BeF{sub 4}) and FLiNaK (Li-Na-K-F) coolants at temperatures up to 800 C. Mixed potential theory is used to account for the protection of steel by beryllium, Tafel kinetics are used to predict rates of dissolution as a function of temperature and potential, and the thinning of the mass-transfer boundary layer with increasing Reynolds number is accounted for with dimensionless correlations. The model also accounts for the deceleration of corrosion as the coolants become saturated with dissolved chromium and iron. This paper also reports electrochemical impedance spectroscopy of steels at their corrosion potentials in high-temperature molten salt environments, with the complex impedance spectra interpreted in terms of the interfacial charge transfer resistance and capacitance, as well as the electrolyte conductivity. Such in situ measurement techniques provide valuablemore »
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 945805
- Report Number(s):
- LLNL-CONF-409085
Journal ID: ISSN 0272-9172; TRN: US200903%%806
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Conference
- Resource Relation:
- Journal Volume: 1125; Conference: Presented at: MRS Fall Meeting 2008, Boston, MA, United States, Dec 01 - Dec 05, 2008
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; BERYLLIUM; BOUNDARY LAYERS; CHROMIUM; COOLANTS; CORROSION; DISSOLUTION; ELECTROLYTES; FERRITIC STEELS; FLIBE; FLUORIDES; HYBRID SYSTEMS; IMPEDANCE; IRON; KINETICS; MASS TRANSFER; MOLTEN SALTS; OXIDES; REYNOLDS NUMBER; SPECTRA; SPECTROSCOPY; STEELS
Citation Formats
Farmer, J, El-Dasher, B, de Caro, M S, and Ferreira, J. Corrosion of Ferritic Steels in High Temperature Molten Salt Coolants for Nuclear Applications. United States: N. p., 2008.
Web. doi:10.1557/PROC-1125-R06-09.
Farmer, J, El-Dasher, B, de Caro, M S, & Ferreira, J. Corrosion of Ferritic Steels in High Temperature Molten Salt Coolants for Nuclear Applications. United States. https://doi.org/10.1557/PROC-1125-R06-09
Farmer, J, El-Dasher, B, de Caro, M S, and Ferreira, J. 2008.
"Corrosion of Ferritic Steels in High Temperature Molten Salt Coolants for Nuclear Applications". United States. https://doi.org/10.1557/PROC-1125-R06-09. https://www.osti.gov/servlets/purl/945805.
@article{osti_945805,
title = {Corrosion of Ferritic Steels in High Temperature Molten Salt Coolants for Nuclear Applications},
author = {Farmer, J and El-Dasher, B and de Caro, M S and Ferreira, J},
abstractNote = {Corrosion of ferritic steels in high temperature molten fluoride salts may limit the life of advanced reactors, including some hybrid systems that are now under consideration. In some cases, the steel may be protected through galvanic coupling with other less noble materials with special neutronic properties such a beryllium. This paper reports the development of a model for predicting corrosion rates for various ferritic steels, with and without oxide dispersion strengthening, in FLiBe (Li{sub 2}BeF{sub 4}) and FLiNaK (Li-Na-K-F) coolants at temperatures up to 800 C. Mixed potential theory is used to account for the protection of steel by beryllium, Tafel kinetics are used to predict rates of dissolution as a function of temperature and potential, and the thinning of the mass-transfer boundary layer with increasing Reynolds number is accounted for with dimensionless correlations. The model also accounts for the deceleration of corrosion as the coolants become saturated with dissolved chromium and iron. This paper also reports electrochemical impedance spectroscopy of steels at their corrosion potentials in high-temperature molten salt environments, with the complex impedance spectra interpreted in terms of the interfacial charge transfer resistance and capacitance, as well as the electrolyte conductivity. Such in situ measurement techniques provide valuable insight into the degradation of materials under realistic conditions.},
doi = {10.1557/PROC-1125-R06-09},
url = {https://www.osti.gov/biblio/945805},
journal = {},
issn = {0272-9172},
number = ,
volume = 1125,
place = {United States},
year = {Tue Nov 25 00:00:00 EST 2008},
month = {Tue Nov 25 00:00:00 EST 2008}
}
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