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Quasicrystal-containing magnesium alloy with high corrosion resistance and preparation method and application thereof

A technology for corrosion resistance and magnesium alloys, applied in the field of magnesium alloys, can solve the problems of poor corrosion resistance of magnesium alloys, and achieve the effects of high corrosion resistance, low density and high corrosion resistance.

Active Publication Date: 2013-09-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a quasicrystalline magnesium alloy with high corrosion resistance and its preparation method and application, to solve the problem of extremely poor corrosion resistance of magnesium alloys, and to introduce quasicrystalline phases into magnesium alloys by rationally selecting alloy elements In the matrix, quasicrystal-containing single-phase and dual-phase ultralight magnesium alloys with good uniform corrosion and high pitting resistance in NaCl aqueous solution at room temperature were prepared.

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  • Quasicrystal-containing magnesium alloy with high corrosion resistance and preparation method and application thereof
  • Quasicrystal-containing magnesium alloy with high corrosion resistance and preparation method and application thereof

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[0039] The preparation method of the high-corrosion-resistant magnesium alloy of the present invention includes introducing a quasi-crystalline phase into an alloy matrix and subsequent homogenization treatment. The specific steps of its specific smelting and casting and subsequent homogenization treatment are as follows:

[0040] 1) Drying and preheating: the drying temperature of conventional auxiliary materials (covering agent / refining agent) is 120-180°C; the preheating temperature of various ingredients and casting molds is 150-300°C; Slag spoons, bell jars, casting spoons, etc.) are cleaned and preheated in a molten washing flux at 700-740°C.

[0041] In the present invention, the covering agent can be a mixture of LiCl and LiF, wherein the weight ratio of LiCl and LiF is (3:1)-(4:1), and their weight sum accounts for 2-4% of the total weight of the charge. In addition, the refining agent may be LiBr.

[0042] 2) Melting of magnesium ingots: set the temperature at 720-...

Embodiment 1

[0051] Ⅰ), alloy composition

[0052] 15 kg of Mg-Li-Zn-Y magnesium-lithium alloy materials are configured according to the following proportions. ) 750 grams and the balance of magnesium (Mg).

[0053] Ⅱ), alloy smelting and casting

[0054] The alloy is smelted in a 15 kg capacity crucible and electric resistance furnace. The crucible and casting molds are made of mild steel. Taking Example 1 as an example, the smelting and casting process of the alloy will be described in detail below.

[0055] 1) Set the target temperature of the crucible to 720°C and start heating; then preheat various ingredients such as pure magnesium, pure zinc, magnesium-yttrium intermediate alloy, and pure lithium in an oven to 150°C, and at the same time will account for 2 % of the covering agent (the covering agent uses LiCl and LiF, and the weight ratio of LiCl and LiF is 3:1) is baked in an oven; the casting mold is preheated to 300°C in another box furnace.

[0056] 2) When the crucible hea...

Embodiment 2

[0070] The difference from Example 1 is that

[0071] Ⅰ), alloy composition

[0072] According to the following proportions, 15 kilograms of Mg-Li-Zn-Y magnesium-lithium alloy materials are weighed and taken out: lithium (Li) 1200 grams, zinc (Zn) 900 grams, magnesium-yttrium master alloy (Mg-24wt%Y ) 750 grams and the balance of magnesium (Mg).

[0073] Ⅱ), alloy smelting and casting

[0074] With reference to the smelting and casting of Example 1, the finally obtained Mg-Li-Zn-Y magnesium-lithium alloy is a quasi-crystalline dual-phase magnesium-lithium alloy in the α-Mg and β-Li dual-phase region, and by weight percentage, its The components and their contents are as follows: lithium content is 8%; zinc content is 6%; yttrium content is 1.2%; magnesium content is the balance balance.

[0075] Ⅲ), homogenization treatment

[0076] The ingot was homogenized at 360°C for 6 hours to eliminate the segregation of alloying elements and fully dissolve low-melting phases such as M...

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Abstract

The invention relates to the field of magnesium alloy, specifically to a quasicrystal-containing magnesium alloy with high corrosion resistance and a preparation method and an application thereof, especially to a quasicrystal-containing magnesium alloy material which has good uniform corrosion and high pitting resistance in a NaCl aqueous solution at room temperature and a method for preparing the alloy material. According to the invention, the poor corrosion resistance problem of magnesium alloy is solved. Through reasonable selection of alloying elements, a quasicrystal phase is introduced into a magnesium alloy matrix so as to prepare the quasicrystal-containing Mg-Li alloy with high corrosion resistance. The quasicrystal-containing magnesium alloy can be a quasicrystal phase reinforced magnesium alloy of the alpha-Mg monophase field and alpha-Mg+beta-Li diphasic filed, and contains the following components: by weight, 0-11.5% of Li, 5-10% of Zn, 0.5-2% of Y and the balance Mg. A product is obtained after alloy smelting and subsequent homogenization treatment. The treatment technology is simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a quasicrystal-containing magnesium alloy with high corrosion resistance and its preparation method and application, especially having better uniform corrosion and higher pitting resistance in NaCl aqueous solution at room temperature An ultra-light magnesium alloy material containing quasicrystals and a method for preparing the alloy material. Background technique [0002] Magnesium-lithium alloy is currently the lightest metal structure material in engineering applications, with a density of 1.35-1.65g / cm 3 Among them, it has the characteristics of high specific strength and specific stiffness, strong cold and hot deformation ability, no obvious anisotropy and good low temperature performance. Magnesium-lithium alloys also have many advantages of magnesium alloys, such as strong resistance to high-energy particle penetration, good electromagnetic shielding performance, good dam...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03C22F1/06
Inventor 许道奎韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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