Corrosion of 316H stainless steel in flowing FLiNaK salt

Type 316H stainless steel samples were exposed to flowing FLiNaK salt for 1000 h in a monometallic thermal convection loop (TCL) with a maximum temperature of 650 °C and a minimum of 540 °C. Samples in the hottest part of the TCL lost mass, with a maximum mass loss of 1.4 mg/cm2, while samples in th...

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Bibliographic Details
Published in:Journal of nuclear materials 2022-04, Vol.561 (4), p.153551, Article 153551
Main Authors: Raiman, Stephen S., Kurley, J. Matthew, Sulejmanovic, Dino, Willoughby, Adam, Nelson, Scott, Mao, Keyou, Parish, Chad M., Greenwood, M. Scott, Pint, Bruce A.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Chromium
Convection
Corrosion
Fluoride Salt
Free convection
Iron
Manganese
MATERIALS SCIENCE
Molten salt
Molten salt reactor
MSR
Salts
Stainless steel
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Summary:Type 316H stainless steel samples were exposed to flowing FLiNaK salt for 1000 h in a monometallic thermal convection loop (TCL) with a maximum temperature of 650 °C and a minimum of 540 °C. Samples in the hottest part of the TCL lost mass, with a maximum mass loss of 1.4 mg/cm2, while samples in the coldest parts of the TCL gained mass, with a maximum mass gain of 1.0 mg/cm2. Analysis of the samples that gained mass showed an Fe-rich layer on the sample surfaces, indicating that Fe, not Cr, was the primary deposition product in the TCL. Cr loss was apparent to a depth of ∼5 µm in the hot leg. Post-exposure analysis of the salt showed major increases in the Cr, Fe, and Mn contents. The TCL was modeled using the TRANSFORM code. Modeled values matched the experimental temperature measurements showing that TRANSFORM is capable of accurately simulating the TCL conditions.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2022.153551