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Electrochemistry of samarium in lithium-beryllium fluoride salt mixture

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Journal of Rare Earths 2011年第8期29卷 798-803页

作者： Martin Straka Michal Korenko Frantisek Lisy Lórant Szatmáry Department of Fluorine Chemistry Nuclear Research Institute Rez plc 250 68 Husinec-Rez 130 Czech Republic Institute of Inorganic Chemistry Slovak Academy of Sciences Dubravska cesta 9 SK-845 36 Bratislava Slovakia

The electrochemical behaviour of samarium was investigated in LiF-BeF2 system on an inert （Mo） electrode by cyclic voltammetry and chronopotentiometry at 804, 833, 847 and 872 K. Redox process Sm3＋＋e–→Sm2＋ was recognized and analysed. Cyclic voltammetry data suggested that at potential sweep rates lower than 0.25 V/s, the reduction was limited by the diffusion of Sm3＋ ions. It was not possible to observe reduction process of Sm2＋＋2e–→Sm0 due to insufficient electrochemical stability of LiF-BeF2. Diffusion coefficients of Sm3＋ ions in LiF-BeF2 were calculated from voltammetric and chronopotentiometric data in the temperature range 804–872 K. Diffusion coefficient values obeyed Arrhenius law. Activation energy was calculated to be 102.5 kJ/mol.

关键词： spent fuel reprocessing pyrochemical partitioning electrochemical separation molten fluorides LiF-BeF2 samarium rare earths

electrochemical deposition of Nd and Nd-Fe alloy from Cu6Nd alloy in a NaCl-KCl-NdCl3 melt

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1650-1656页

作者： Chen-teng Sun Qian Xu Yan-ping Xiao Yong-xiang Yang State Key Laboratory of Advanced Special Steel School of Material Science and EngineeringShanghai UniversityShanghai 200072China Department of Materials Science and Engineering Delft University of TechnologyDelft 2628 CDThe Netherlands Department of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002China

Electrorefining effectively separates metals from their corresponding *** obtain Nd from Cu6 Nd alloy,cyclic voltammetry and square wave voltammetry were used to investigate the reduction behavior of Nd^(3+) and the anode dissolution behavior of Cu6 Nd in the Na Cl-KCl-0.5 mol%Nd Cl3 melt at 1023 *** to the analysis of the electrochemical behavior,the cell voltage was determined to be between 0.3 and 1.2 V for separating Nd from Cu6 *** electrolysis at 0.6 V for 4 h,the Nd was found at the surface of the Mo cathode without any *** the Fe cathode,a deposition with an atom ratio of Nd:Fe=1:1 was formed on the ***,the low current density of separation remains a great experimental challenge that must be solved.

关键词： Cu6Nd alloy molten salt electrochemical separation NaCl-KCl-NdCl3

electrochemical Isolation and Determination of GCP Phase in a Fe-Cr-Ni Alloy

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Journal of Iron and Steel Research(International) 1997年第2期4卷 50-54页

作者： Ma Xiang Lu Cuifen Central Iron and Steel Research Institute MMI

Geometrical Close Packed(GCP) phase in Fe-Cr-Ni alloy was quantitatively isolated and precisely determined when electrolyzed in 10%HPOelectrolyte at a low current density of5 mA/cm~2 and 22 ℃±1 ℃.The transpassive dissolution potential of the alloy matrix under above conditions is about 1 140 mV(SCE),at which GCP phase is in passive state and can be isolated from the alloy.

关键词： phase analysis electrochemical separation anodic isolation GCP phase Fe-Cr-Ni alloy

electrochemical Isolation and Determination of GCP Phase in a Fe-Cr-Ni Alloy

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Journal of Iron and Steel Research International 1997年第2期4卷 52-56页

作者： Ma Xiang, Lu CuifenCentral Iron and Steel Research Institute, MMI,Beijing (100081), China Central Iron and Steel Research Institute MMI

Geometrical Close Packed (GCP) phase in Fe Cr Ni alloy was quantitatively isolated and precisely determined when electrolyzed in 10 % H 3PO 4 electrolyte at a low current density of 5 mA/cm 2 and 22 ℃±1 ℃. The transpassive dissolution potential of the alloy matrix under above conditions is about 1 140 mV (SCE), at which GCP phase is in passive state and can be isolated from the alloy.[WT5”HZ〗

关键词： phase analysis electrochemical separation anodic isolation GCP phase Fe Cr Ni alloy