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Method for removing iron impurity from magnesium alloy by using Al-B intermediate alloy

An intermediate alloy and magnesium alloy technology, which is applied in the field of smelting and purification of magnesium alloys, can solve the problems of low yield, increased oxidation of magnesium liquid, and impurities brought in, and achieve the effect of less dosage and stable effect

Inactive Publication Date: 2012-01-25
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the wettability problem between the flux and the magnesium liquid, the yield of effective elements for removing Fe in the flux into the magnesium liquid is low. During the smelting process, the high-temperature volatilization and decomposition of chlorides and fluorides will release harmful gases.
In addition, flux removal of iron is also easy to bring impurities into the magnesium solution, increasing the oxidation of the magnesium solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] The original grade of AZ91D magnesium alloy die-casting scraps and returned materials is 2.3kg in total, and the average content of impurity Fe in the alloy is 0.014% (mass fraction, the same below). Al-B master alloy, the content of B element is 3.46%, the content of impurity Fe is 0.44%, the content of other single impurity elements is not more than 0.2%, and the balance is Al.

[0020] The above magnesium alloy was placed in a graphite clay crucible and heated and melted in a resistance crucible furnace.

[0021] The magnesium alloy melt temperature is 700°C, and 9g of Al-B master alloy is added. After the master alloy is melted, let it stand for 5 minutes and pour it into a graphite mold.

[0022] Chemical composition analysis of the magnesium alloy after Fe removal shows that the impurity Fe content is 0.0031%, and the B content is 0.0015%.

[0023] The impurity Fe content in the magnesium alloy after Fe removal meets the requirements of the national standard GB / ...

example 2

[0025] The original brand is AZ31B magnesium alloy 1.7kg, and the impurity Fe content is 0.01%. Al-B master alloy, the content of B element is 3.46%, the content of impurity Fe is 0.44%, the content of other single impurity elements is not more than 0.2%, and the balance is Al.

[0026] The above magnesium alloy was placed in a graphite clay crucible and heated and melted in a resistance crucible furnace.

[0027] The magnesium alloy melt temperature is 740°C, and 6g of Al-B master alloy is added. After the master alloy is melted, it is refined with argon gas. After refining, it is left to stand for 10 minutes and poured into a graphite mold.

[0028] Chemical composition analysis of the magnesium alloy after Fe removal shows that the impurity Fe content is 0.0020%, and the B content is 0.0010%.

[0029] The impurity Fe content in the magnesium alloy after Fe removal meets the requirements of the national standard GB / T5153-2003 "Deformed Magnesium and Magnesium Alloy Grades ...

example 3

[0031] The original brand is AZ61A magnesium alloy 2.7kg, in which the impurity Fe content is 0.0090%. Al-B master alloy, the content of B element is 1.31%, the content of impurity Fe is 0.30%, the content of other single impurity elements is not more than 0.2%, and the balance is Al.

[0032] The above magnesium alloy was placed in a graphite clay crucible and heated and melted in a resistance crucible furnace.

[0033] The magnesium alloy melt temperature is 760°C, and 12g of Al-B master alloy is added. After the master alloy is melted, it is refined with argon gas. After refining, it is left to stand for 2 minutes and poured into a graphite mold.

[0034] Chemical composition analysis of the magnesium alloy after Fe removal shows that the impurity Fe content is 0.0030%, and the B content is 0.0009%.

[0035] The impurity Fe content in the magnesium alloy after Fe removal meets the requirements of the national standard GB / T5153-2003 "Deformed Magnesium and Magnesium Alloy ...

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Abstract

The invention discloses a method for removing iron impurity from magnesium alloy by using Al-B intermediate alloy. The Al-B intermediate alloy is added in the magnesium alloy smelting process, and the intermediate alloy supplies an effective element B for removing iron to the melt. The method is suitable for removing the iron impurity from the magnesium alloy containing an alloy element Al; and the method has stable iron removing effect, little impurity introduction during removing the iron, low melt oxidization degree and no harmful gas release.

Description

technical field [0001] The invention relates to the technical field of smelting and purifying magnesium alloys and improving the corrosion resistance of magnesium alloy products, in particular to a method for removing impurity iron in magnesium alloys by using an Al-B master alloy. Background technique [0002] Fe impurities in magnesium alloys will seriously affect the corrosion resistance of the alloys, so the content of Fe impurities in magnesium alloys is strictly limited. The production and recycling of magnesium alloys must effectively remove Fe impurities. [0003] Existing methods for removing Fe from magnesium alloy smelting are all methods of removing Fe using fluxes in smelting, such as oxides, chlorides, fluorides, etc. containing B elements, Ti elements, and Mn elements. The B elements in these fluxes , Ti element, Mn element and the impurity Fe element in the molten magnesium alloy form a stable compound, which is precipitated in the liquid magnesium alloy or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C23/00C22C21/00
Inventor 郭建穆云超徐向俊黄小婷刘英
Owner ZHONGYUAN ENGINEERING COLLEGE
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