Impact of corrosion test container material in molten fluorides
- Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
- Woodward Inc., Fort Collins, CO (United States)
- Univ. of Wisconsin-Madison, Madison, WI (United States)
The effects of crucible material choice on alloy corrosion rates in immersion tests in molten LiF–NaF–KF (46.5–11.5-42 mol. %) salt held at 850 °C for 500 hrs are described. Four crucible materials were studied. Molten salt exposures of Incoloy-800H in graphite, Ni, Incoloy-800H, and pyrolytic boron nitride (PyBN) crucibles all led to weight-loss in the Incoloy-800H coupons. Alloy weight loss was ~30 times higher in the graphite and Ni crucibles in comparison to the Incoloy-800H and PyBN crucibles. It is hypothesized galvanic coupling between the alloy coupons and crucible materials contributed to the higher corrosion rates. Alloy salt immersion in graphite and Ni crucibles had similar weight-loss hypothesized to occur due to the rate limiting out diffusion of Cr in the alloys to the surface where it reacts with and dissolves into the molten salt, followed by the reduction of Cr from solution at the molten salt and graphite/Ni interfaces. As a result, both the graphite and the Ni crucibles provided sinks for the Cr, in the formation of a Ni–Cr alloy in the case of the Ni crucible, and Cr carbide in the case of the graphite crucible.
- Research Organization:
- Savannah River Site (SRS), Aiken, SC (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC09-08SR22470
- OSTI ID:
- 1240878
- Report Number(s):
- SRNL-STI-2015-00319
- Journal Information:
- Journal of Solar Energy Engineering, Vol. 137, Issue 6; ISSN 0199-6231
- Publisher:
- ASMECopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Re‐establishing the paradigm for evaluating halide salt compatibility to study commercial chloride salts at 600°C–800°C
|
journal | April 2019 |
Non-Aqueous Electrochemical Fluorination of Used Nuclear Fuel as an Advanced Separation Process
|
journal | January 2019 |
Similar Records
Materials corrosion in molten LiF-NaF-KF eutectic salt under different reduction-oxidation conditions
Corrosion evaluation of metal foams in eutectic molten salts for high temperature latent heat energy storage application