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

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
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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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