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The Research about Electrodeposition of Mg-Li-Dy Alloys by Electrolysis in Molten Salt

Author: YangYuSheng
Tutor: ZhangMiLin
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Molten salt electrolysis Codeposition Magnesium lithium dysprosium alloy Current efficiency
CLC: TG146.22
Type: Master's thesis
Year: 2009
Downloads: 22
Quote: 0
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Abstract


This thesis method by molten salt electrolysis of deposition performance of the magnesium - lithium alloy material was prepared , and the process conditions of the electrolysis process , dysprosium oxide solubility in the electrolyte , the alloy co-deposited as well as the factors that affect the element content of the alloy group study . And explore the rare earth element dysprosium refinement in Mg-Li alloy . Alloys and molten salt components were analyzed by ICP-AES , XRD, SEM , EDS and metallographic optical microscope the alloy microstructure microscopic structure observed test . Through the process of research on the electrolysis process , draw preferred electrolytic conditions : The quality of the MgCl2, LiCl, KCl and KF were 15g , 45g, 45g and 5g, the added amount of the oxide, dysprosium Dy content in the alloy according to the required changes ( 0.1% -1%, wt%), an electrolysis temperature of 680 ℃, a current density of 12 A cm -2 , the cell voltage for the 6.3V - 7.0V . The maximum current efficiency obtained in this preferred process conditions can reach 84%. Co-deposition of the molten salt electrolysis is the standard by ion deposition potential of ion activity overpotential on the cathode material and the depolarization of the plasma discharge these factors affect the complex process . This article studies the added amount of the magnesium chloride , i.e. , the concentration of Mg2 electrolyte impact magnesium lithium DYSPROSIUM alloy of depositing an important factor . This thesis right the magnesium lithium dysprosium alloys XRD analysis proved the and alloys mainly a-Mg phase formed of magnesium in the alloy is the dysprosium stable compound for Mg3Dy . And XRD diffraction peak intensity , the energy spectrum of semi-quantitative analysis with ICP-AES analysis of the alloy composition mutual authentication. SEM line scan and area-scan photos and EDS analysis shows the uniformity of the resulting alloys . And spectrum analysis of the grain boundaries of Mg and Dy atomic ratio close to 3:1, with the XRD the Mg3Dy observed diffraction peaks are proved. The microstructure obtained by metallographic optical microscope confirmed that the refinement of Dy for the Mg-Li alloys , the Dy content is higher, the refinement of the more obvious .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Magnesium
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