skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Impact of corrosion test container material in molten fluorides

Journal Article · · Journal of Solar Energy Engineering
DOI:https://doi.org/10.1115/1.4031682· OSTI ID:1240878
 [1];  [1];  [1];  [2];  [3];  [3];  [1];  [1];  [3]
  1. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
  2. Woodward Inc., Fort Collins, CO (United States)
  3. Univ. of Wisconsin-Madison, Madison, WI (United States)
+ Show Author Affiliations

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
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

References (9)

High-Temperature Liquid-Fluoride-Salt Closed-Brayton-Cycle Solar Power Towers journal January 2007
Design, Fabrication, and Testing of Ceramic Plate-Type Heat Exchangers with Integrated Flow Channel Design: Design, Fabrication and Testing of Ceramic Plate Type Heat Exchangers journal September 2011
Materials corrosion in molten LiF–NaF–KF salt journal January 2009
Intergranular corrosion of high temperature alloys in molten fluoride salts journal June 2010
The principal problems of aluminum electrowinning: an update journal June 2000
Corrosion of metals by molten salts in heat-treatment processes journal March 1985
X-ray photoelectron spectroscopy investigation of the carburization of 310 stainless steel journal December 2003
AES–XPS study of chromium carbides and chromium iron carbides journal April 1999
Effect of Composition and Structure on Crevice, Intergranular, and Stress Corrosion of Some Wrought Ni-Cr-Mo Alloys journal March 1976

Cited By (2)

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

Related Subjects

14 SOLAR ENERGY
36 MATERIALS SCIENCE
alloys
corrosion
graphite
weight (mass)