A kind of 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 limited application range of magnesium alloys, and achieve good mechanical properties and stability, good compatibility, and obvious corrosion resistance Effect

Active Publication Date: 2021-05-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of high strength and high corrosion resistance ternary magnesium alloy and preparation method thereof
  • A kind of high strength and high corrosion resistance ternary magnesium alloy and preparation method thereof
  • A kind of high strength and high corrosion resistance ternary magnesium alloy and preparation method thereof

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Effect test

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-resistant ternary magnesium alloy and a preparation method thereof. The magnesium alloy includes the following element components in mass percentage: Y 8-12wt%, Al 0.6-3wt%, and the balance is Mg. Through: (1) under protective atmosphere, Mg-Y master alloy, aluminum ingot and magnesium ingot are prepared into magnesium alloy melt; (2) under protective atmosphere, magnesium alloy melt is left standstill after stirring, then refining Degassing and slag removal, standing still and keeping warm to obtain magnesium alloy liquid; (3) under protective atmosphere, casting magnesium alloy liquid to form an ingot; the above three steps finally obtain high-strength and high-corrosion-resistant ternary magnesium alloy . Compared with the prior art, the invention has the advantages of good corrosion resistance, high mechanical properties, low sensitivity to impurity iron elements, simple preparation process and the like.

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 Patents(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 JIAOTONG UNIV
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