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High-strength and high-corrosion-resistance ternary magnesium alloy and preparation method thereof

A magnesium alloy and corrosion-resistant technology, applied in the field of magnesium alloys, can solve the problems of unfavorable service, poor absolute mechanical properties, and poor corrosion resistance of magnesium alloys, and achieve obvious corrosion resistance, good compatibility, and improved mechanical properties.

Active Publication Date: 2020-06-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike metals such as aluminum, once magnesium is corroded, its oxide film is MgO or Mg(OH) 2 , its PBR (Pilling-Bedworthratio) is less than 1, it is not dense, and it cannot prevent further oxidation and cause increased corrosion, which makes it unfavorable for magnesium alloys to serve in relatively humid environments
[0003] Two of the most prominent bottlenecks currently restricting the industrial application of magnesium alloys are: 1. Poor absolute mechanical properties
2. Poor corrosion resistance
These solutions not only require a certain cost, but also use a large amount of raw materials that seriously pollute the environment, and the scope of use is very limited.

Method used

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  • High-strength and high-corrosion-resistance ternary magnesium alloy and preparation method thereof
  • High-strength and high-corrosion-resistance ternary magnesium alloy and preparation method thereof
  • High-strength and high-corrosion-resistance ternary magnesium alloy and preparation method thereof

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Embodiment 1

[0034] The present embodiment prepares the method for ternary magnesium alloy, in protective atmosphere (protective gas is SF 6 and CO 2 Mixed gas), carry out the following steps:

[0035] (1) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), after melting the magnesium ingot with a purity of not less than 99.9ωt%, add Mg-Y master alloy and aluminum ingot at 660-700°C, and after the Mg-Y master alloy and aluminum ingot are melted, A magnesium alloy melt is obtained.

[0036] (2) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), the magnesium alloy melt was stirred at 730-740°C and then allowed to stand for 20 minutes, then refined at 740-750°C for degassing and slag removal, and then placed at 730-740°C Carry out heat preservation 30min, obtain magnesium alloy liquid;

[0037] (3) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), the magnesium alloy solution is cast to obtain an ingot;

[0...

Embodiment 2

[0041] This embodiment prepares the method for novel corrosion-resistant ternary magnesium alloy, carries out the following steps:

[0042] (1) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), after melting the magnesium ingot with a purity of not less than 99.9ωt%, add Mg-Y master alloy and aluminum ingot at 660-700°C, and after the Mg-Y master alloy and aluminum ingot are melted, A magnesium alloy melt is obtained.

[0043] (2) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), the magnesium alloy melt was stirred at 730-740°C and then allowed to stand for 20 minutes, then refined at 740-750°C for degassing and slag removal, and then placed at 730-740°C Carry out heat preservation 30min, obtain magnesium alloy liquid;

[0044] (3) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), the magnesium alloy solution is cast to obtain an ingot;

[0045] (4) Put the magnesium alloy ingot into the air...

Embodiment 3

[0048] The method for preparing the novel corrosion-resistant ternary magnesium alloy in this embodiment includes:

[0049] (1) In a protective atmosphere (the protective gas is SF 6 and CO 2 mixed gas), after melting the magnesium ingot with a purity of not less than 99.9wt%, add Mg-Y master alloy and aluminum ingot at 660-700°C, and after the Mg-Y master alloy and aluminum ingot are melted, A magnesium alloy melt is obtained.

[0050] (2) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), the magnesium alloy melt was stirred at 730-740°C and then allowed to stand for 20 minutes, then refined at 720-730°C for degassing and slag removal, and then placed at 720-730°C Carry out heat preservation 30min, obtain magnesium alloy liquid;

[0051] (3) In a protective atmosphere (the protective gas is SF 6 and CO 2 Mixed gas), the magnesium alloy solution is cast to obtain an ingot;

[0052] (4) Put the magnesium alloy ingot into the air furnace for sol...

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Abstract

The invention relates to a high-strength and high-corrosion-resistance ternary magnesium alloy and a preparation method thereof. The magnesium alloy comprises, by mass, 8-12 wt% of Y, 0.6-3 wt% of Aland the balance Mg. The method comprises the following steps that (1) under a protective atmosphere, a Mg-Y intermediate alloy, an aluminum ingot and a magnesium ingot are prepared to prepare a magnesium alloy melt; (2) under the protective atmosphere, the magnesium alloy melt stands after being stirred, refining and degassing, and slag removal are carried out, and the magnesium alloy melt standsagain and preserves heat to obtain magnesium alloy liquid; (3) the magnesium alloy liquid is cast into a mold under the protective atmosphere to form a cast ingot; and finally, the high-strength and high-corrosion-resistance ternary magnesium alloy is obtained through the above three steps. Compared with the prior art, the method has the advantages of being good in corrosion resistance, high in mechanical property, low in sensitivity to impurity iron elements and simple in preparation process.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a high-strength and high-corrosion-resistant ternary magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal among commonly used metal materials. Its low density, high specific strength and specific stiffness, and high thermal conductivity and damping performance make magnesium alloy have extremely wide application prospects. However, the absolute strength of magnesium alloy itself is low, and the mechanical properties are not very satisfactory. At the same time, the corrosion resistance of magnesium alloy also greatly limits the further promotion of magnesium alloy. However, the chemical properties of magnesium are relatively active in nature, which is determined by its thermodynamic nature, and its electrode potential is the lowest among common metal materials (~-2.38V NHE ), which are generally corroded as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06C22F1/002
Inventor 李扬欣曾小勤朱庆春应韬
Owner SHANGHAI JIAO TONG UNIV
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