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Method for removing impurity iron in magnesium alloy by using al-zr master alloy

A technology of master alloy and magnesium alloy, which is applied in the field of removing impurity iron in magnesium alloy by using Al-Zr master alloy to achieve the effect of stable effect

Active Publication Date: 2021-08-27
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a method for removing impurity iron in magnesium alloy (Mg-Al system) by using Al-Zr master alloy, aiming at overcoming the deficiency in the precipitation and Fe removal process in the existing magnesium alloy smelting process

Method used

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  • Method for removing impurity iron in magnesium alloy by using al-zr master alloy
  • Method for removing impurity iron in magnesium alloy by using al-zr master alloy

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Experimental program
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Effect test

Embodiment 1

[0020] The original grade of AZ91D magnesium alloy die-casting scrap and returned material is 3.2kg in total, and the average content of impurity Fe in the alloy is 0.015% (mass fraction, the same below). Al-5Zr master alloy, its Zr element content is 5.2%, impurity Fe content is 0.05%.

[0021] The above magnesium alloy was placed in a graphite clay crucible and heated and melted in a resistance crucible furnace.

[0022] The temperature of the magnesium alloy melt is 740°C, and 58g of the Al-5Zr master alloy is added according to the content of the Zr element being 6 times that of the impurity Fe. After the master alloy is melted, argon gas is introduced for refining. After the refining is completed, the 750°C alloy melt is poured into a graphite mold through a 20ppi SiC filter preheated at 750°C.

[0023] Chemical composition analysis The magnesium alloy after Fe removal has an impurity Fe content of 0.0031%, and a residual Zr content of less than 0.001%.

[0024] The imp...

Embodiment 2

[0026] The original brand is AZ31 magnesium alloy die-casting scraps and recycled materials totaling 2kg, and the average content of impurity Fe in the alloy is 0.011%. Al-3Zr master alloy, its Zr element content is 3.1%, impurity Fe content is 0.01%.

[0027] The above magnesium alloy was placed in a graphite clay crucible and heated and melted in a resistance crucible furnace.

[0028] The temperature of the magnesium alloy melt is 680°C, and 36g of the Al-3Zr master alloy is added according to the content of the Zr element being 5 times that of the impurity Fe. After the master alloy is melted, argon gas is introduced for refining. After refining, the 650°C alloy melt is poured into a graphite mold through a 15ppi SiC filter preheated at 760°C.

[0029] Chemical composition analysis of the magnesium alloy after Fe removal has an impurity Fe content of 0.002%.

Embodiment 3

[0031] The original brand is AZ91 magnesium alloy die-casting scrap and returned charge total 2.2kg, the average content of impurity Fe in the alloy is 0.021%. The Al-20Zr master alloy has a Zr element content of 19.8% and an impurity Fe content of 0.02%.

[0032] The above-mentioned magnesium alloy is heated and melted in a magnesia crucible in a medium-frequency induction heating furnace.

[0033] The magnesium alloy melt temperature is 780°C, and 24g of Al-3Zr master alloy is added according to the content of Zr element 10 times that of impurity Fe. After the master alloy is melted, argon gas is introduced for refining. After refining, the 800°C alloy melt is poured into a graphite mold through a 50ppi SiC filter.

[0034] Chemical composition analysis of the magnesium alloy after Fe removal shows that the impurity Fe content is 0.0033%, and the residual Zr content is less than 0.001%.

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Abstract

The invention provides a method for removing impurity iron in a magnesium alloy by using an Al-Zr master alloy. The Al-Zr master alloy is added during the smelting process of the magnesium alloy, and the melt is filtered by a ceramic filter when the melt is poured. The content of Zr element in the Al-Zr master alloy is 3-20wt%, the content of a single impurity element is ≤0.5%, the sum of impurity elements is ≤1.0%, and the balance is Al. The effective component for removing iron in the Al-Zr master alloy of the present invention is thick acicular and skeletal Al 3 Zr phase. These Al 3 In the magnesium alloy melt, the Zr phase adheres to the surface layer to form a compound containing Zr and Fe along with the dissolution of the surface layer Zr and Al elements. These compounds together with Al 3 The size of the Zr phase is coarse, and it is easy to block it through the filter screen, so it does not need to be left to stand for precipitation to achieve iron removal.

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-Zr 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. In particular, Fe impurities must be effectively removed in the recovery and reuse of recycled materials and leftover materials in the production of magnesium alloys and magnesium alloy products. [0003] The existing method of removing Fe from magnesium alloy smelting is a precipitation method, that is, adding a certain element and combining with Fe in the magnesium alloy melt to form a stable compound with a density higher than that of magnesium, which is allowed to sink to the melting point after s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C23/00
CPCC22C1/03C22C1/06C22C23/00
Inventor 郭建史光远樊平张济州黄小婷
Owner ZHONGYUAN ENGINEERING COLLEGE
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