Re-establishing the paradigm for evaluating halide salt compatibility to study commercial chloride salts at 600°C–800°C

Pint, Bruce A.; Mcmurray, Jake W.; Willoughby, Adam W.; Kurley III, James; Pearson, Samuel; Lance, Michael J.; Leonard, Donovan N.; Meyer III, Harry; Jun, Jiheon; Raiman, Stephen S.; Mayes, Richard

doi:10.1002/maco.201810638

Re-establishing the paradigm for evaluating halide salt compatibility to study commercial chloride salts at 600°C–800°C

Conference · Mon Apr 01 00:00:00 EDT 2019 · Materials and Corrosion

DOI:https://doi.org/10.1002/maco.201810638· OSTI ID:1546538

^[1]; ^[1]; Willoughby, Adam W. ^[1]; ^[1]; Pearson, Samuel ^[1]; ^[1]; ^[1]; ^[1]; ^[1]; ^[1]; ^[1]

ORNL

Chloride salts are one candidate for a >700°C concentrating solar power (CSP) cycle, however, many reports from the literature suggest very high reaction rates between chloride salts and structural alloys. Historically, a specific methodology was established for evaluating halide salt compatibility based on solution kinetics. This study returned to that paradigm where the salts are purified and evaluated in sealed capsules before moving to a flowing experiment to determine a true corrosion rate in a temperature gradient for a commercial K–Mg–Na chloride salt. Isothermal testing focused on Ni-based alloys 230 and 600 at 600°C–800°C. The results indicated there were promising combinations of salt chemistry, temperature, and alloy composition that reduce the extent of reaction. The results of the first monometallic thermal convection loop of alloy 600 run for 1,000 hr with a peak temperature of 700°C showed low attack with rates ≤9 µm/yr.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1546538

Journal Information:: Materials and Corrosion, Journal Name: Materials and Corrosion; ISSN 0947-5117

Country of Publication:: United States

Language:: English

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