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Magnesium-lithium alloy and preparation method thereof

A technology of magnesium-lithium alloy and intermediate alloy, which is applied to the preparation of magnesium-lithium ultra-light alloy materials and the preparation of magnesium alloys, can solve the problem of low corrosion resistance of magnesium alloys, and achieves the advantages of inhibiting corrosion, simple processing technology, and inhibiting corrosion. The effect of interfacial corrosion

Active Publication Date: 2019-04-09
常州赛密思新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the defect that the corrosion resistance of magnesium alloys in the prior art is not high, the present invention provides a corrosion-resistant Mg-Li-Zn-Gd-Ca magnesium-lithium alloy, which adds a certain mass ratio of Zn and Gd to the magnesium-lithium alloy Element, introduce quasi-crystalline phase into the solidification structure of magnesium-lithium alloy, inhibit interfacial corrosion, and at the same time add Ca element to promote the formation of dense Ca(OH) on the alloy surface 2 , so that the alloy has a low density and excellent corrosion resistance

Method used

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preparation example Construction

[0043] The preparation method of a corrosion-resistant magnesium-lithium alloy described in the present invention is divided into two stages, that is, smelting and heat treatment process; wherein,

[0044] 1. Melting, in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0045] (1) Baking material: take pure Mg, pure Zn, Mg-Gd master alloy, Mg-Ca master alloy and Li rod, and weigh the lithium salt flux according to 5-10% of the mass of the prepared alloy, and the lithium salt flux is determined by mass ratio It is a 3:1 mixture of LiCl and LiF. Then, preheat all the above-mentioned raw materials for more than 3 hours to reach 180°C-250°C;

[0046] (2) Melting Mg: Melting the dried pure Mg and flux in a crucible resistance furnace;

[0047] (3) Add Zn and Gd: Add pure Zn to the magnesium liquid at 700°C~740°C, the amount added is determined according to the mass percentage of Zn; after the pure Zn is melted, add when the melt temperature ...

Embodiment 1

[0057] A corrosion-resistant magnesium-lithium alloy, 100Kg, each component and its mass percentage are: 3.0wt.% Li, 2.5wt.% Zn, 1wt.% Gd, 0.2wt.% Ca, impurity elements Si, Fe, Cu The total amount of Ni and Ni is 0.01wt.%, and the balance is Mg. (wt.% refers to the percentage of the components in the total mass of the prepared alloy, which is the sum of the mass of Mg, Li, Zn and various master alloys).

[0058] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and heat treatment.

[0059] 1. Melting, in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0060] (1) Baking material: Take pure Mg, pure Zn, Mg-Gd master alloy, Mg-Ca master alloy and Li rod according to the mass percentage of the above-mentioned magnesium-lithium alloy, and weigh lithium salt flux according to 5% of the mass of the prepared alloy, lithium The salt flux is made by mixing LiCl and LiF with a mass ratio of 3:1. Then, ...

Embodiment 2

[0072] A corrosion-resistant magnesium-lithium alloy, 100kg, its composition and mass percent are: 4wt.% Li, 5wt.% Zn, 2wt.% Gd, 0.4wt.% Ca, impurity elements Si, Fe, Cu and Ni The total amount is less than 0.005wt.%, and the balance is Mg (wt.% refers to the percentage of the components in the total mass of the prepared alloy, which is the sum of the mass of Mg, Li, Zn and various master alloys).

[0073] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and heat treatment.

[0074] 1. Melting, in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0075] (1) Baking materials: take pure Mg, pure Zn, Mg-Gd master alloy, Mg-Ca master alloy and Li rods, and weigh lithium salt flux according to 5% of the mass of the prepared alloy, and the lithium salt flux has a mass ratio of 3 :1 LiCl and LiF mixed. Then, preheat all the above raw materials for 3.5 hours to reach 200°C;

[0076] (2) Melting Mg: P...

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Abstract

The invention provides magnesium lithium alloy and a preparation method thereof. The magnesium lithium alloy comprises, by mass, 3-5 wt% of Li, 2.5-7.5 wt% of Zn, 1-3 wt% of Gd, 0.2-0.6 wt% of Ca, less than 0.02 wt% of the total quantity of impurity elements, and the balance Mg. The preparation method mainly comprises the steps of smelting and heat treatment. The magnesium lithium alloy has extremely high corrosion resistance.

Description

technical field [0001] The invention belongs to a preparation method of a magnesium alloy, in particular to a preparation method of a magnesium-lithium ultralight alloy material with good uniform corrosion and high pitting corrosion resistance in NaCl aqueous solution at room temperature by adding Zn, Gd and Ca elements, belonging to The field of metal materials technology. Background technique [0002] Magnesium alloy has the advantages of low density, wide range of sources, high specific strength and specific stiffness, etc., and is known as "the green engineering material of the 21st century". By adding Li to magnesium alloys for alloying, its density can be further reduced and the plasticity of magnesium alloys can be improved. Therefore, magnesium-lithium alloys have broad potential application prospects in aerospace and other fields that require high weight reduction. At present, one of the problems limiting the application of magnesium-lithium alloys is their poor co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C23/04C22C1/03
CPCC22C1/03C22C23/00C22C23/04
Inventor 张扬封爱成陈逸李小平卢雅琳田国镖杜兴鹏
Owner 常州赛密思新材料有限公司
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