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Corrosion of Ni-Based Alloys and Stainless Steels in Molten Fluoride Salts for Gen IV Reactors

Picture for Corrosion of Ni-Based Alloys and Stainless Steels in Molten Fluoride Salts for Gen IV Reactors
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Several Generation IV nuclear reactor concepts feature molten fluoride salt coolants. Corrosion of alloys in molten fluorides remains a challenge.  Static exposure tests of nickel-based alloys and austenitic stainless steels were conducted in the molten fluoride salt known as FLiNaK.

Product Number: 51317--9132-SG
ISBN: 9132 2017 CP
Author: Kevin Chan
Publication Date: 2017
Industry: Energy Generation
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Corrosion of Ni-Based Alloys and Stainless Steels in Molten Fluoride Salts for Gen IV Nuclear ReactorsKevin J. Chan Julie Luong and Preet M. SinghSchool of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GASeveral Generation IV nuclear reactor concepts feature molten fluoride salt coolants. However corrosion of structural alloys in molten fluorides remains a challenge. Due to the solubility of oxides in the molten fluoride oxide films cannot be relied-upon to retard corrosion of structural alloys. Therefore corrosion is most dependent on the alloy composition and salt chemistry as found by previous studies. To better understand these factors static exposure tests and electrochemical tests were conducted in the molten fluoride salt known as FLiNaK. Potentiodynamic polarization experiments were conducted for several candidate alloys including Ni based alloys and stainless steels. Moisture and metal-ion impurity concentrations were varied. Specimen surfaces and cross sections were examined using optical and scanning electron microscopy. A Ni/Ni2+ reference electrode with LaF3 single crystal ion conductive membrane was developed to enable electrochemical tests.

Corrosion of Ni-Based Alloys and Stainless Steels in Molten Fluoride Salts for Gen IV Nuclear ReactorsKevin J. Chan Julie Luong and Preet M. SinghSchool of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GASeveral Generation IV nuclear reactor concepts feature molten fluoride salt coolants. However corrosion of structural alloys in molten fluorides remains a challenge. Due to the solubility of oxides in the molten fluoride oxide films cannot be relied-upon to retard corrosion of structural alloys. Therefore corrosion is most dependent on the alloy composition and salt chemistry as found by previous studies. To better understand these factors static exposure tests and electrochemical tests were conducted in the molten fluoride salt known as FLiNaK. Potentiodynamic polarization experiments were conducted for several candidate alloys including Ni based alloys and stainless steels. Moisture and metal-ion impurity concentrations were varied. Specimen surfaces and cross sections were examined using optical and scanning electron microscopy. A Ni/Ni2+ reference electrode with LaF3 single crystal ion conductive membrane was developed to enable electrochemical tests.

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ISBN: 9497 2017 CP
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Nickel based alloys are candidate materials for high temperature structural applications in Fluoride Salt Cooled High Temperature Reactors. This study presents preliminary data on the corrosion behavior of selected experimental Nickel alloys in 46.5 LiF-11.5 NaF-42.0 KF (FLiNaK).
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ISBN: 8825 2017 CP
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51318-11182-Effects of Pre-Oxidiation and Carburization on Corrosion in Molten Fluoride Salts

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Static exposure tests of pre-oxidized stainless steel and carburized chromium were conducted in the molten fluoride salt, LiF-NaF-KF (46.5-11.5-42 mol %), FLiNaK to simulate the corrosion environment typical of some advanced nuclear reaction concepts.
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