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A method for controlling the electrochemical performance of magnesium-lithium alloy and magnesium-lithium alloy

A technology of magnesium-lithium alloy and control method, which is applied in the field of magnesium-lithium alloy preparation, can solve the problems of poor corrosion resistance of as-cast magnesium-lithium alloy, and achieve the effect of improving electrochemical performance and facilitating processing

Inactive Publication Date: 2017-02-01
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect of the poor corrosion resistance of cast magnesium-lithium alloys in the prior art, thereby providing a method that can improve the electrochemical performance of magnesium-lithium alloys including corrosion resistance. Control Method

Method used

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  • A method for controlling the electrochemical performance of magnesium-lithium alloy and magnesium-lithium alloy
  • A method for controlling the electrochemical performance of magnesium-lithium alloy and magnesium-lithium alloy
  • A method for controlling the electrochemical performance of magnesium-lithium alloy and magnesium-lithium alloy

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Embodiment 1

[0038] This embodiment provides a method for extrusion of a magnesium-lithium alloy, comprising the following steps:

[0039] A. Heat the Mg-8Li-Al-Pb-Mn alloy billet to 320°C for 1.5h;

[0040] B. Heat the extrusion die to 450°C;

[0041] C. Heat the temperature of the extrusion barrel surrounding the mold to 310°C;

[0042] D. Extrude the magnesium-lithium alloy blank at the above-mentioned temperature with an extrusion die at the above-mentioned temperature at an extrusion ratio of 15:1 to form a magnesium-lithium alloy plate with a cross-sectional size of 15 mm.

Embodiment 2

[0044]This embodiment provides a method for extrusion of a magnesium-lithium alloy, comprising the following steps:

[0045] A. Heat the Mg-8Li-Al-Pb-Mn alloy billet to 320°C for 1.5h;

[0046] B. Heat the extrusion die to 450°C;

[0047] C. Heat the temperature of the extrusion cylinder surrounding the mold to 330°C;

[0048] D. Extrude the magnesium-lithium alloy blank at the above-mentioned temperature with an extrusion die at the above-mentioned temperature at an extrusion ratio of 15:1 to form a magnesium-lithium alloy plate with a cross-sectional size of 15 mm.

Embodiment 3

[0050] This embodiment provides a method for extrusion of a magnesium-lithium alloy, comprising the following steps:

[0051] A. Heat the Mg-8Li-Al-Pb-Mn alloy billet to 320°C for 1.5h;

[0052] B. Heat the extrusion die to 450°C;

[0053] C. Heat the temperature of the extrusion barrel surrounding the mold to 350°C;

[0054] D. Extrude the magnesium-lithium alloy blank at the above-mentioned temperature with an extrusion die at the above-mentioned temperature at an extrusion ratio of 15:1 to form a magnesium-lithium alloy plate with a cross-sectional size of 15 mm.

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Abstract

The invention provides a magnesium-lithium alloy electrochemical property control method. With the method of the present invention, the traditional idea of the single use of the casting-state magnesium-lithium alloy is broken through, the casting-state magnesium-lithium alloy blank is subjected to extrusion operation, and the alloy blank temperature, the extrusion cylinder temperature, the extrusion mold temperature, the thermal insulation time and other factors are controlled, such that the corrosion potential of the extruded magnesium-lithium alloy in a 0.7-1.0 mol / L NaCl solution achieves -1.8 V to -1.4 V, the open circuit potential achieves -1.8 V to -1.5 V, the constant current oxidation potential achieves -1.6 V to 0 V, the electrochemical impedance achieves 30-160 omega.cm<2>, and the electrochemical performance of the alloy of the present invention is substantially improved compared to the pure casting-state magnesium-lithium alloy.

Description

technical field [0001] The invention relates to a method for controlling the electrochemical performance of a magnesium-lithium alloy and the magnesium-lithium alloy, belonging to the technical field of magnesium-lithium alloy preparation. Background technique [0002] Mg-Li alloy is an ultra-light metal material, and its density is only 1 / 2 of that of aluminum alloy and 3 / 4 of that of traditional magnesium alloy. Mg-Li alloy has the characteristics of low density, specific strength, specific stiffness, and high specific modulus of elasticity, and Has good casting performance and cutting performance. Therefore, its die castings are widely used in automobile manufacturing, aerospace, communications, optical instruments and computer manufacturing. [0003] In recent years, Mg-Li alloys have been widely used in large and thin passenger cars and ships, and are especially suitable for manufacturing large and thin passenger car boxes, frames, ledges, car bodies and ship hulls. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C23/02C22F1/06
Inventor 张琳琳
Owner BEIJING BORGWARD AUTOMOBILE CO LTD