Preparation method of rare earth magnesium alloy

A rare earth magnesium and alloy technology, applied in the field of magnesium alloys, can solve the problem of low rare earth addition and the like

Inactive Publication Date: 2011-12-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The existing process for synthesizing rare earth magnesium alloys by molten salt electrolysis has the following two disadvantages: first, it is necessary to redesign the electrolytic furnace or electrolytic cell for changes in raw materials and process conditions; The rare earth content usually exceeds 20%, and the prepared alloy is deposited at the bottom of the molten salt, and the rare earth addition amount of the rare earth magnesium alloy used in the production process is relatively low, generally not exceeding 10%, so the rare earth magnesium alloy prepared according to this method is subsequently Remelting is also required to meet device requirements for rare earth content

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  • Preparation method of rare earth magnesium alloy

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[0020] The embodiment of the present invention discloses a preparation method of a rare earth magnesium alloy, comprising:

[0021] A magnesium electrolytic cell is used, and a mixture of a magnesium electrolytic molten salt system and rare earth chloride is used as an electrolyte molten salt, and the content of rare earth chloride in the electrolyte molten salt is 2wt% to 15wt%, and the electrolyte is heated at 650°C to 720°C The molten salt is electrolyzed, and at the same time anhydrous magnesium chloride and rare earth chloride with a weight ratio of (1.5-11): 1 are added to the magnesium electrolytic cell to form a rare earth magnesium alloy on the upper part of the electrolyte molten salt.

[0022] The present invention directly adopts the existing magnesium electrolytic cell, adjusts the composition of the electrolyte molten salt and the composition of the added molten salt, and further prepares the rare earth magnesium alloy with the rare earth content not exceeding 10w...

Embodiment 1

[0046] Carry out electrolysis after adding electrolyte molten salt in magnesium electrolyzer, electrolyte molten salt comprises the CaCl of 96wt% 2 -KCl-NaCl-MgCl 2 Molten salt system and 4wt% LaCeCl 3 , the electrolysis temperature is controlled at 670°C, and the cathode current density is 1A / cm 2 , the anode current density is 0.2A / cm 2 , add anhydrous MgCl with a weight ratio of 87:13 to the magnesium electrolyzer during electrolysis 2 and LaCeCl 3 , the rare earth magnesium alloy is formed on the surface of the electrolyte molten salt, and the reaction ends after 2 hours of electrolysis.

[0047] After the reaction, it was measured that the yield of the alloy was 104 g, and the content of lanthanum and cerium in the alloy was 4%. The calculated current efficiency is 82%, the direct recovery rate of magnesium is 91%, and the direct recovery rate of lanthanum and cerium is 89%.

[0048] Such as figure 1 Shown is the scanning electron micrograph of the alloy product ob...

Embodiment 2

[0050] Carry out electrolysis after adding electrolyte molten salt in magnesium electrolyzer, electrolyte molten salt comprises KCl-NaCl-MgCl of 98wt% 2 Molten salt system and 2wt% LaCl 3 , the electrolysis temperature is controlled at 650°C, and the cathode current density is 0.5A / cm 2 , the anode current density is 0.1A / cm 2 , add anhydrous MgCl with a weight ratio of 90:10 to the magnesium electrolyzer during electrolysis 2 and LaCl 3 , the rare earth magnesium alloy is formed on the surface of the electrolyte molten salt, and the reaction ends after 2 hours of electrolysis.

[0051] After the reaction, it was measured that the yield of the alloy was 97g, and the La content in the alloy was 2%. The calculated current efficiency is 85%, the direct recovery rate of magnesium is 93%, and the direct recovery rate of La is 86%.

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Abstract

The invention provides a preparation method of a rare earth magnesium alloy, comprising: adopting a magnesium electrolytic cell, using a mixture of a magnesium electrolytic molten salt system and a rare earth chloride as an electrolyte molten salt, and the content of the rare earth chloride in the electrolyte molten salt is 2wt% ~15wt%, at 650°C~720°C, the electrolyte molten salt is electrolyzed, and at the same time, anhydrous magnesium chloride and rare earth chloride with a weight ratio of (1.5~11):1 are added to the magnesium electrolyzer. A rare earth magnesium alloy is formed on the upper part of the electrolyte molten salt. In the present invention, by adjusting the weight ratio of magnesium electrolytic molten salt system and rare earth chloride in the electrolyte molten salt and the ratio of anhydrous magnesium chloride and rare earth chloride added in the electrolysis process, the direct preparation of rare earth magnesium alloy in the existing electrolytic magnesium factory is realized. At the same time, the rare earth content in the prepared rare earth magnesium alloy does not exceed 10%.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a preparation method of rare earth magnesium alloys. Background technique [0002] Magnesium alloy is recognized as a green engineering material in the 21st century. Magnesium alloy has the advantages of light weight, high specific strength, rich resources, good processing performance and convenient recycling. It is widely used in aerospace, automobile manufacturing and electronic products. Traditional magnesium alloys mainly include magnesium-aluminum alloy and magnesium-manganese alloy, etc. These alloys have poor heat resistance and corrosion resistance, which restricts their development. [0003] Compared with traditional magnesium alloys such as magnesium aluminum alloys, the heat resistance, corrosion resistance and oxidation resistance of rare earth magnesium alloys are significantly improved, which effectively expands the application range of magnesium alloys. The prior a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/04
Inventor 孟健牛晓东申家成田政孙伟邱鑫张德平杜海王鸿燕唐定骧鲁化一赵连山
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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