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Method for directly preparing Mg-Zr alloy by MgCl2, K2ZrF6 and ZrO2 electrolysis

A mg-zr, alloy technology, applied in the field of magnesium alloy product preparation, can solve the problems of complex process, high energy consumption, low zirconium solubility, etc., achieve uniform alloy composition, shorten the process flow, and solve the effects of composition segregation

Inactive Publication Date: 2010-07-21
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of the reduction method are: the temperature is high, the molten salt volatilizes seriously, mechanical stirring is required, the energy consumption is large, the obtained alloy product is prone to slag inclusion, and the production process is long and complicated, which belongs to intermittent production, so the production cost is relatively high. high
[0007] Due to the low solubility of zirconium in magnesium, the Mg-Zr master alloy produced by these methods at present, when the zirconium content exceeds 0.6%, the magnesium and zirconium in the alloy are generally mechanically mixed, and there is a serious segregation phenomenon

Method used

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  • Method for directly preparing Mg-Zr alloy by MgCl2, K2ZrF6 and ZrO2 electrolysis
  • Method for directly preparing Mg-Zr alloy by MgCl2, K2ZrF6 and ZrO2 electrolysis
  • Method for directly preparing Mg-Zr alloy by MgCl2, K2ZrF6 and ZrO2 electrolysis

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: with MgCl 2 +KCl+K 2 ZrF 6 +ZrO 2 +KF is an electrolyte system, the mass percentage of each component is 34.6%, 52%, 5.3%, 2.3%, 5.8%, with an inert metal electrode molybdenum (Mo) as the cathode, and a cathode product collection sleeve is put on the cathode , graphite is the anode, the electrolysis temperature is 700°C, the pole distance is 4cm, and the cathode current density is 6.37A / cm 2 , the anode current density is 0.5A / cm 2 , the cell voltage is 8-9V, the specific gravity of the alloy is less than that of the electrolyte, the alloy floats on the upper part of the electrolyte, and is protected by argon gas. After 1 hour of electrolysis, Mg-Zr alloy is deposited near the cathode in the molten salt electrolytic cell. The content of magnesium and zirconium They are 99.8% and 0.2% respectively.

Embodiment 2

[0018] Embodiment 2: with MgCl 2 +KCl+K 2 ZrF 6 +ZrO 2 +KF is an electrolyte system, the mass percentage of each component is 34.6%, 52%, 5.3%, 2.3%, 5.8%, with an inert metal electrode molybdenum (Mo) as the cathode, and a cathode product collection sleeve is put on the cathode , graphite is the anode, the electrolysis temperature is 800°C, the pole distance is 4cm, and the cathode current density is 6.37A / cm 2 , the anode current density is 0.5A / cm 2 , the cell voltage is 7-8.5V, the specific gravity of the alloy is less than that of the electrolyte, the alloy floats on the upper part of the electrolyte, and is protected by argon gas. After 1 hour of electrolysis, Mg-Zr alloy, magnesium and zirconium are deposited near the cathode in the molten salt electrolytic cell. The contents are 98.0% and 2.0%, respectively.

Embodiment 3

[0019] Embodiment 3: with MgCl 2 +KCl+K 2 ZrF 6 +ZrO 2 +KF is an electrolyte system, the mass percentage of each component is 34.6%, 52%, 5.3%, 2.3%, 5.8%, with an inert metal electrode molybdenum (Mo) as the cathode, and a cathode product collection sleeve is put on the cathode , graphite is the anode, the electrolysis temperature is 750°C, the pole distance is 4cm, and the cathode current density is 3.18A / cm 2 , the anode current density is 0.5A / cm 2 , the cell voltage is 5.5-6.6V, the specific gravity of the alloy is smaller than that of the electrolyte, the alloy floats on the upper part of the electrolyte, and is protected by argon gas. After 1 hour of electrolysis, Mg-Zr alloy, magnesium and zirconium are deposited near the cathode in the molten salt electrolytic cell. The contents are 98.3% and 1.7% respectively.

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Abstract

The invention provides a method for directly preparing Mg-Zr alloy by electrolyzing MgCl2, K2ZrF6 and ZrO2. KCl and K2ZrF6 are dried under 600 DEG C, and anhydrous MgCl2 and KF are dried at 130 DEG C under the vacuum condition; KCl, K2ZrF6, anhydrous MgCl2, KF and ZrO2 are ground and mixed evenly in the ratio of 35 percent to 45 percent : 5.3 percent to 15 percent:35 percent to 45 percent:0.1 percent to 4.5 percent:2 percent to 4 percent, and then heated and melted in an electrobath; a metal molybdenum wire is taken as the cathode, a cathode product collecting sleeve is arranged on the cathode, a graphite rod is taken as the anode, the electrobath temperature is between 650 DEG C and 800 DEG C, the cathode current density is 6A / cm<2> to 13A / cm<2> and the electrobath voltage is 5V to 9V; the temperature is preserved for 10min to 40min after one hour of electrolysis, and the Mg-Zr alloy is deposited near the cathode in the molten salt electrobath; the whole process is carried out underthe protection of argon. With the method, even alloy components can be obtained; and the method solves the technical difficulty of component segregation of the Mg-Zr intermediate alloy, and is characterized by greatly shortened technological process, low operation temperature and low production cost.

Description

(1) Technical field [0001] What the present invention relates to is a kind of electrolytic MgCl 2 and K 2 ZrF 6 , ZrO 2 The method for directly preparing Mg-Zr alloy belongs to the technical field of magnesium alloy product preparation. (2) Background technology [0002] Magnesium alloy has the advantages of light weight, high specific strength and specific stiffness, good damping and shock resistance, excellent dimensional stability and good machining performance, and the resource reserves of magnesium in nature are abundant and easy to recycle. It is known as the green environmental protection of the 21st century. Engineering materials are favored by material workers and are increasingly becoming ideal materials for modern industrial products. Magnesium alloys can be divided into zirconium-containing magnesium alloys and zirconium-free magnesium alloys according to whether they contain zirconium. [0003] Because zirconium has a strong grain refinement effect on magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
Inventor 张密林韩伟刘瑞国景晓燕
Owner HARBIN ENG UNIV
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