Magnesium lithium alloy and preparation method thereof

A magnesium-lithium alloy and intermediate alloy technology, which is applied in the preparation of magnesium alloys and the preparation of magnesium-lithium ultra-light alloy materials, can solve the problems of low corrosion resistance of magnesium alloys, and achieve corrosion suppression, interfacial corrosion suppression, and processing technology. Simple operation effect

Active Publication Date: 2017-10-03
常州赛密思新材料有限公司
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  • Application Information

AI Technical Summary

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, in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0043] The preparation method of a corrosion-resistant magnesium-lithium alloy according to the present invention is divided into two stages, namely smelting and heat treatment process steps; among them,

[0044] 1. Melting, in SF 6 And CO 2 Under mixed gas protection conditions, 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 prepared alloy mass. The lithium salt flux is determined by the mass ratio It is a mixture of 3:1 LiCl and LiF. Then, preheat all the above raw materials for more than 3 hours to reach 180℃~250℃;

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

[0047] (3) Add Zn and Gd: add pure Zn to the magnesium liquid at 700℃~740℃, the addition amount is determined according to the mass percentage of Zn; after the pure Zn is melted, the melt temperature rises to 700℃~740℃. Master alloy Mg...

Example Embodiment

[0056] Example 1

[0057] A corrosion-resistant magnesium-lithium alloy, 100Kg, in which the components and their mass percentages 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 formulated alloy, which is the sum of the masses of Mg, Li, Zn and various intermediate 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 mixed gas protection conditions, 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 above-mentioned magnesium-lithium alloy mass percentage, and weigh the lithium salt flux according to 5% of the prepared alloy mass. The salt flux is a mixture of LiCl and LiF with a mass ratio of 3:1. Then,...

Example Embodiment

[0071] Example 2

[0072] A corrosion-resistant magnesium-lithium alloy, 100kg, its components and their mass percentages are: 4wt.% Li, 5wt.% Zn, 2wt.% Gd, 0.4wt.% Ca, and impurities of 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 formulated alloy, and the total mass is the sum of the masses of Mg, Li, Zn and various intermediate alloys).

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

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

[0075] (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% of the mass of the prepared alloy. The lithium salt flux has a mass ratio of 3 :1 LiCl and LiF are mixed. Then, preheat all the above raw materials for 3.5 hours to 200°C...

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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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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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