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5. Thermodynamic assessment of solubility and activity of iron, chromium, and nickel in lead bismuth eutectic

Author

Braun, James, Sauder, Cédric, Brackx, Emmanuelle, Domenger, Renaud, Balbaud-Célérier, Fanny, Chatain, Sylvie, Alpettaz, Thierry, Crivello, J.-C., Joubert, J.-M., Pham Thi, T.-N., Dumas, J.-C., Bouineau, V., Dupin, N., Guéneau, Christine, Benigni, P., Maugis, Ph., Rogez, J., Gossé, Stéphane, Laboratoire des Technologies des Matériaux EXtrêmes (LTMEx), Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département des Matériaux pour le Nucléaire (DMN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Métallographie et Analyse Chimique (LMAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Chimie métallurgique des terres rares (CMTR), Centre National de la Recherche Scientifique (CNRS), Service d'Etudes de Simulation du Comportement du combustibles (SESC), Département d'Etudes des Combustibles (DEC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Calcul Thermodynamique, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and IM2NP

Subjects
010302 applied physics, Nuclear and High Energy Physics, Materials science, Lead-bismuth eutectic, Alloy, Metallurgy, Thermodynamics, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, 01 natural sciences, Corrosion, Coolant, [SPI]Engineering Sciences [physics], Nuclear Energy and Engineering, 13. Climate action, 0103 physical sciences, engineering, General Materials Science, Solubility, 0210 nano-technology, CALPHAD, Dissolution, ComputingMilieux_MISCELLANEOUS, Eutectic system
Abstract

Lead–Bismuth Eutectic (LBE) is a heavy liquid alloy used as a coolant for the Lead-Cooled Fast Reactors and spallation target for Accelerator Driven Systems. LBE is also considered in sodium fast reactor designs as coolant in secondary circuit to avoid any occurrence of the reaction between sodium and water in steam generators. Even if this coolant presents many advantages due to its thermophysical properties, corrosion towards structural materials remains one of the major issues of LBE. Because corrosion in LBE is partly driven by dissolution processes, the solubility and chemical activity of the main elements of the alloy are the key parameters to model the related corrosion processes. Using the Calphad method and the Thermo-Calc software, a thermodynamic database was developed to assess the interaction between Cr–Ni–Fe alloys and LBE. The current thermodynamic data on the Cr–Fe–Ni + Bi–Pb quinary system was reviewed and the Bi–Cr and Cr–Pb binary phase diagrams were assessed. Fe, Cr and Ni solubilities (in at. fraction, T in K) at LBE composition were calculated: Fe solubility at LBE composition : log 10 ( S Fe ) = 0.5719 - 4398.6 T ( 399 – 1173 K ) Cr solubility at LBE composition : log 10 ( S Cr ) = - 0.2757 - 3056.1 T ( 399 – 1173 K ) Ni solubility at LBE composition : log 10 ( S Ni ) = 2.8717 - 2932.9 T ( 528 – 742 K ) log 10 ( S Ni ) = 0.2871 - 1006.3 T ( 742 – 1173 K ) Then, the thermodynamic assessment performed in this study was used to predict more accurately the Fe, Cr and Ni activities and solubilities in the case of four austenitic model alloys also studied in the framework of corrosion tests [1]. The calculated activities and solubilities provide thermodynamic data to better understand dissolution or precipitation phenomena observed during LBE corrosion processes.

Published
2014

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