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Method for preparing Mg-Sr alloy through molten salt electrolytic codeposition
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A molten salt electrolysis and co-deposition technology, which is applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of less than 30% strontium utilization rate and large strontium volatilization loss, so as to improve the utilization rate of resources and energy, and reduce energy consumption. , the effect of reducing production costs
Active Publication Date: 2014-08-27
EAST CHINA UNIV OF SCI & TECH
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[0007] The preparation of Mg-Sr alloy by immersion reduction method is to add strontium compounds to the magnesium melt, and add metal strontium to the magnesium melt by reducing the strontium compounds through magnesium. This method is only suitable for adding a small amount (less than 0.1%wt) of strontium; with the increase of temperature, the volatilization loss of strontium is relatively large, and the utilization rate of strontium is usually less than 30%
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Embodiment 1
[0023] with MgCl 2 +SrCl 2 +KCl+CaCl 2 It is an electrolyte system, the mass percentage of each component is 18.7%, 64.3%, 13%, 4%, respectively, metal tungsten (W) is used as the cathode, graphite is used as the anode, the electrolysis temperature is 730°C, the pole distance is 4cm, the cathode current density 10A / cm 2 , the anode current density is 0.4A / cm 2 , the cell voltage is 4.0V ~ 6.5V, after 4 hours of electrolysis, a Mg-Sr alloy is co-deposited near the cathode in the molten salt electrolytic cell, and the mass percentages of magnesium and strontium are 30.2% and 67.8% respectively, and the balance is 2%. of calcium.
Embodiment 2
[0025] with MgCl 2 +SrCl 2 +KCl+BaCl 2 It is an electrolyte system, the mass percentage of each component is 4.32%, 60.54%, 15.31%, and 19.83%, respectively, metal tungsten (W) is used as the cathode, graphite is used as the anode, the electrolysis temperature is 780 ° C, the pole distance is 4cm, the cathode current density 10A / cm 2 , the anode current density is 0.5A / cm 2 , the cell voltage is 5.0V ~ 7.5V, after a long period of electrolysis, Mg-Sr alloy is co-deposited near the cathode in the molten salt electrolytic cell, and the mass percentages of magnesium and strontium are 77.76% and 22.24% respectively.
Embodiment 3
[0027] with MgCl 2 +SrCl 2 +KCl+KF is the electrolyte system, the mass percentages of each component are 10.32%, 68.54%, 18.31%, and 2.83%, respectively, metal tungsten (W) is used as the cathode, graphite is used as the anode, the electrolysis temperature is 700°C, and the pole distance is 4cm , the cathode current density is 10A / cm 2 , the anode current density is 0.5A / cm 2 , the cell voltage is 4.0V ~ 6.5V, after a long period of electrolysis, Mg-Sr alloy is co-deposited near the cathode in the molten salt electrolytic cell, and the mass percentages of magnesium and strontium are 68.76% and 31.24% respectively.
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Abstract
The invention relates to a method for preparing a Mg-Sr alloy through molten salt electrolytic codeposition. The method comprises the following steps: an inertia metal material (such as Mo, W, and Fe) is treated as the cathode, graphite is treated as the anode, an electrolyte which is formed by adding a mixture of MgCl2, SrCl2, and some cosolvents to an electrolytic tank and heating for melting is used for electrolysis according to the following electrolytic conditions: the mass ratio of SrCl2 to MgCl2 is greater than 3.34:1, that is, the molar ratio of Sr<2+> to Mg<2+> is greater than 2:1, the temperature in the electrolytic tank is controlled at 600-850DEG C; the current density of the cathode is greater than 7A / cm<2>, and the tank voltage is 3.5-7.5V; and the Mg-Sr alloy can be deposited near the cathode in the molten salt electrolytic tank through electrolyzing for a long time. The method of the invention has the following advantages: the Mg-Sr alloy is directly obtained by one step of molten salt electrolytic codeposition with adopting metallic compounds as raw materials without individually preparing magnesium metal and strontium metal; compared with the technological process of a direct reaction method, the technological process is greatly shortened; and the method of the present invention allows disadvantages of large energy consumption, large oxidation loss of alloy metals, high production cost and the like existing in present methods for the production of the Mg-Sr alloy to be satisfactorily solved.
Description
【Technical field】 [0001] The invention relates to the technical field of alloy preparation, in particular to a method for preparing a magnesium-strontium alloy by molten salt electrolytic co-deposition. 【Background technique】 [0002] Magnesium alloy is currently the lightest engineering metal material, widely used in automobiles, electronics, aviation and other fields, and is an important material to replace aluminum alloy, steel and engineering plastics. Strontium is an effective modifier. Many studies have shown that adding Sr to magnesium alloys can refine alloy grains, reduce micro-shrinkage and reduce porosity, thereby greatly improving the high-temperature creep resistance of magnesium alloys. Mg-Sr alloy is an important heat-resistant magnesium alloy, which is very important and widely used in the manufacture of automotive internal combustion engine parts and transmission mechanism parts. [0003] The traditional preparation methods of Mg-Sr alloys include pairing m...
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