Mg-Li-Ce-La alloy and fused salt electrolysis preparation thereof

A cerium-lanthanum alloy and molten salt electrolysis technology, which is applied in the field of molten salt electrolysis metallurgy, can solve the problems of element burnout, difficult control of composition, inability to disperse lithium and rare earth well, and achieves extended service life, low production cost, Energy saving effect

Inactive Publication Date: 2008-11-12
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] a. The prepared magnesium-lithium alloy will inevitably produce severe segregation of metal lithium and rare earth; because magnesium, lithium, and rare earth have a large difference in specific gravity, lithium and rare earth cannot be well dispersed in magnesium
[0006] b. In the process of blending and melting, because the melting point of rare earth metals is much higher than that of magnesium and lithium, it will inevitably cause serious burning loss of active elements such as magnesium and lithium, making it difficult to control the composition

Method used

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  • Mg-Li-Ce-La alloy and fused salt electrolysis preparation thereof
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  • Mg-Li-Ce-La alloy and fused salt electrolysis preparation thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: with MgCl 2 +LiCl+KCl+KF is the electrolyte system, the mass percentage of each component is 13.7%, 40.9%, 40.9%, 4.5%, and then according to MgCl 2 3.3% by weight of rare earth carbonate is added, the inert metal electrode molybdenum (Mo) is used as the cathode, graphite is used as the anode, the electrolysis temperature is 800°C, the pole distance is 4cm, and the cathode current density is 16A / cm 2 , the anode current density is 0.5A / cm 2 , cell voltage 7.0V, after 2 hours of electrolysis, a Mg-Li-Ce-La alloy was co-deposited near the cathode in the molten salt electrolytic cell, and the contents of magnesium, lithium, cerium, and lanthanum were 90.4%, 3.9%, and 3.1% respectively. %, 2.6%.

Embodiment 2

[0020] Embodiment 2: with MgCl 2 +LiCl+KCl+KF is the electrolyte system, the mass percentage of each component is 13.7%, 40.9%, 40.9%, 4.5%, and then according to MgCl 2 3.3% by weight of rare earth carbonate is added, the inert metal electrode molybdenum (Mo) is used as the cathode, graphite is used as the anode, the electrolysis temperature is 650°C, the pole distance is 4cm, and the cathode current density is 16A / cm 2 , the anode current density is 0.5A / cm 2 , cell voltage 6 ~ 7V, after 2 hours of electrolysis, Mg-Li-Ce-La alloy was co-deposited near the cathode in the molten salt electrolytic cell, and the contents of magnesium, lithium, cerium, and lanthanum were 89.6%, 6.1%, and 1.9%, 2.4%.

Embodiment 3

[0021] Embodiment 3: with MgCl 2 +LiCl+KCl+KF is the electrolyte system, the mass percentage of each component is 9.5%, 42.9%, 42.9%, 4.7%, and then according to MgCl 2 3.3% by weight of rare earth carbonate is added, the inert metal electrode molybdenum (Mo) is used as the cathode, graphite is used as the anode, the electrolysis temperature is 750°C, the pole distance is 4cm, and the cathode current density is 12.7A / cm 2 , the anode current density is 0.5A / cm 2 , the cell voltage is 5.5-6.0V, after 1 hour of electrolysis, a Mg-Li-Ce-La alloy is co-deposited near the cathode in the molten salt electrolytic cell, and the contents of magnesium, lithium, cerium, and lanthanum are 90.3% and 2.8% respectively , 3.0%, 3.9%.

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Abstract

The invention provides a Mg-Li-Ce-La alloy and a method for directly preparing the same by molten salt electrolysis. The method comprises the following steps of: fusing at a temperature of between 750 and 800 DEG C after adding Ce-rich rare-earth carbonate (cerous carbonate and lanthanum carbonate) in an electrolytic furnace by taking MgCl2 plus LiCl plus KCl plus KF as an electrolyte system; depositing the Mg-Li-Ce-La alloy in a molten salt bath close to a cathode via electrolyzing for 1 to 2 hours with an inert metal electrode as the cathode and graphite as an anode, a sunk cathode method, at an electrolysis temperature of between 650 and 800 DEG C, with cathode current density between 12 and 20 A/cm<2>, anode current density 0.5 A/cm<2> and bath voltage between 5.5 and 9.0V. The method completely uses metal compounds as raw materials to directly prepare the Mg-Li-Ce-La alloy with uniform compositions and without a segregation phenomenon through molten salt electrolysis, without using metal magnesium, lithium or rare-earth metal, thereby greatly shortening the production flow, simplifying the process, and reducing the production cost of the alloy.

Description

(1) Technical field [0001] The invention belongs to a method for directly preparing magnesium-lithium-cerium-lanthanum alloy by molten salt electrolysis, and belongs to the technical field of molten salt electrolysis metallurgy. (2) Background technology [0002] Magnesium alloys are favored by all walks of life due to their light weight. However, magnesium alloys have weaknesses such as low strength, poor toughness, poor high temperature resistance, and poor corrosion resistance; , refinement and alloying, has a certain solid solubility in magnesium alloys, and adding rare earths to magnesium alloys can form compounds with good intergranular thermal stability, so magnesium rare earth-based alloys have high strength and relatively high Good high temperature performance. However, due to the presence of rare earth compounds in magnesium alloys, the toughness of the alloys decreases. Magnesium-lithium alloy has low density, good formability, and can be rolled into thin plates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C24/00C22C23/00C25C3/00
Inventor 张密林韩伟田阳谷家运薛云
Owner HARBIN ENG UNIV
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