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Refining agent for magnesium alloy and preparation method thereof

A refining agent and magnesium alloy technology, applied in the refining agent and preparation field that can reduce the iron content in magnesium alloy, can solve the problems that it is difficult to meet the requirements of corrosion resistance, has not been applied on a large scale, and the corrosion resistance of magnesium alloy is harmful. Achieve the effects of less harmful gas emission, improved mechanical properties and corrosion resistance, and low price

Inactive Publication Date: 2008-06-04
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesium alloy is the metal with the smallest density among practical metal structural materials so far. It has the advantages of high specific strength and specific stiffness, thermal conductivity, electromagnetic shielding, good damping and shock absorption, and good environmental compatibility. It has not been applied on a large scale like aluminum alloy, and one of the most important reasons is that its corrosion resistance is poor, and it is difficult to meet the requirements for corrosion resistance of materials in the application field.
Studies have shown that metal impurities such as iron, nickel, cobalt, and copper are very harmful to the corrosion resistance of magnesium alloys, and their allowable content is strictly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A refining agent for magnesium alloy, its composition and content are: 25% by weight of potassium chloride, 5-10% by weight of calcium fluoride, 9% by weight of barium chloride, 10% by weight of manganese chloride, 0.8% by weight % titanium sponge, 1.0% by weight boron oxide, and the balance being magnesium chloride.

[0017] A preparation method for a refining agent for magnesium alloys, comprising the steps of:

[0018] (1) Prepare materials according to the above-mentioned refining agent composition content. It is required that the purity of the raw materials is ≥90%. Boron powder.

[0019] (2) Using a resistance furnace and a steel crucible as the melting equipment, first put magnesium chloride into the bottom of the crucible, and then add potassium chloride, calcium fluoride, barium chloride, and manganese chloride after mixing several materials. Heat up to 550-600°C, stir for 20-30 minutes after all the furnace materials are melted, and keep warm for 1-3 hours, ...

Embodiment 2

[0022] A refining agent for magnesium alloy, its composition and content are: 35% by weight of potassium chloride, 5% by weight of calcium fluoride, 5% by weight of barium chloride, 1% by weight of manganese chloride, 0.2% by weight of sponge Titanium, 0.1% by weight boron oxide, the balance being magnesium chloride.

[0023] A preparation method for a refining agent for magnesium alloys, comprising the steps of:

[0024] (1) Prepare materials according to the above-mentioned refining agent composition content. It is required that the purity of the raw materials is ≥90%. Boron powder.

[0025] (2) Using a resistance furnace and a steel crucible as the melting equipment, first put magnesium chloride into the bottom of the crucible, and then add potassium chloride, calcium fluoride, barium chloride, and manganese chloride after mixing several materials. Heat up to 550-600°C, stir for 20-30 minutes after all the furnace materials are melted, and keep warm for 1-3 hours, then ra...

Embodiment 3

[0028] A refining agent for magnesium alloy, its composition and content are: 30% by weight of potassium chloride, 7% by weight of calcium fluoride, 7% by weight of barium chloride, 6% by weight of manganese chloride, 0.5% by weight of sponge Titanium, 0.6% by weight boron oxide, the balance being magnesium chloride.

[0029] A preparation method for a refining agent for magnesium alloys, comprising the steps of:

[0030] (1) Prepare materials according to the above-mentioned refining agent composition content. It is required that the purity of the raw materials is ≥90%. Boron powder.

[0031] (2) Using a resistance furnace and a steel crucible as the melting equipment, first put magnesium chloride into the bottom of the crucible, and then add potassium chloride, calcium fluoride, barium chloride, and manganese chloride after mixing several materials. Heat up to 550-600°C, stir for 20-30 minutes after all the furnace materials are melted, and keep warm for 1-3 hours, then ra...

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Abstract

The invention relates to a magnesium alloy refining agent and a preparation method for the magnesium alloy refining agent. The compositions and content of the magnesium alloy refining agent are that: 25 to 35 weight percent of potassium chloride, 5 to 10 weight percent of calcium fluoride, 5 to 9 weight percent of barium chloride, 1 to 10 weight percent of manganese chloride, 0.2 to 0.7 weight percent of titanium sponge and 0.1 to 1.0 weight percent of boron oxide, and the residual is magnesium chloride. By adoption of the magnesium alloy refining agent of the invention, iron content in alloys can be obviously reduced. In the embodiment, wrought magnesium alloys AZ31D are prepared; analytically, contents of main metallic impurities are that: iron: less than or equal to 0.002 percent; copper: less than or equal to 0.001 s; nickel: less than or equal to 0.001 percent.

Description

technical field [0001] The invention relates to a refining agent and a preparation method, in particular to a refining agent capable of reducing iron content in magnesium alloys and a preparation method. Background technique [0002] Magnesium alloy is the metal with the smallest density among practical metal structural materials so far. It has the advantages of high specific strength and specific stiffness, thermal conductivity, electromagnetic shielding, good damping and shock absorption, and good environmental compatibility. It has not been applied on a large scale like aluminum alloys. One of the most important reasons is that its corrosion resistance is poor, and it is difficult to meet the requirements for corrosion resistance of materials in the application field. Studies have shown that metal impurities such as iron, nickel, cobalt, and copper are very harmful to the corrosion resistance of magnesium alloys, and their allowable content is strictly limited. Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C23/00
Inventor 马志新李德富张家振李彦利
Owner GRIMAT ENG INST CO LTD
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