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A kind of corrosion-resistant fast extrusion magnesium alloy and preparation method thereof

A magnesium alloy, corrosion-resistant technology, applied in the field of fast-extruded magnesium alloy and its preparation, can solve the problems of slow extrusion speed and high extrusion cost of magnesium alloy, achieve short time, improve corrosion resistance and strong plastic mechanical properties , the effect of low temperature

Active Publication Date: 2022-02-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alloying is an effective way to improve the corrosion resistance of magnesium and its alloys, but previous studies mainly focused on refining the grain size and the second phase by adding alloying elements to improve the stability of the surface film, while alloying There are relatively few studies on the effects of elements on the size, shape, quantity, and distribution of atomic-scale microstructures in magnesium alloys and the influence of alloys on corrosion resistance.
In addition, the extrusion speed of existing commercial magnesium alloys is slow, such as the extrusion speed of Mg-Al series and Mg-Zn series magnesium alloys is generally 1-5m / min, which is significantly lower than the extrusion speed of commercial 6XXX series aluminum alloys, Leads to higher extrusion costs for magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take the Mg-0.1Al-0.05Ca-0.2Sn-0.01Y-0.05Ce alloy as an example (according to the composition mass percentage: Al: 0.1%, Ca: 0.05%, Sn: 0.2%, Y: 0.01%, Ce: 0.05 %, the unavoidable sum of impurities≤0.05%, and the balance is magnesium), and its preparation method is as follows:

[0025] (1) Under the protection of argon, add pure magnesium, pure aluminum, magnesium-calcium master alloy, pure tin, magnesium-yttrium master alloy in turn, and heat and melt at 680-730°C; then add magnesium-cerium master alloy, Stir evenly at 670-720°C, and obtain alloy liquid after refining, degassing and slag removal;

[0026] (2) casting the molten alloy obtained in step (1) into an ingot by semi-continuous casting;

[0027] (3) The ingot obtained in step (2) is subjected to stepwise homogenization heat treatment under the protection of argon, and the steps are as follows: 340-350°C for 2 hours, 420°C for 5 hours, 450-460°C for 3 hours; then Air cooling to room temperature to obtain a ho...

Embodiment 2

[0032] Take the Mg-0.6Al-0.18Ca-0.01Sn-0.06Y-0.07Nd alloy as an example (according to the composition mass percentage: Al: 0.6%, Ca: 0.18%, Sn: 0.01%, Y: 0.06%, Nd: 0.07 %, the unavoidable sum of impurities≤0.05%, and the balance is magnesium), and its preparation method is as follows:

[0033] (1) Under the protection of argon, add pure magnesium, pure aluminum, magnesium-calcium master alloy, pure tin, magnesium-yttrium master alloy in sequence, and heat and melt at 700-730°C; then add magnesium-neodymium master alloy, Stir evenly at 690-710°C, and obtain alloy liquid after refining, degassing and slag removal;

[0034] (2) casting the molten alloy obtained in step (1) into an ingot by manual casting;

[0035] (3) The ingot obtained in step (2) is subjected to stepwise homogenization heat treatment under the protection of nitrogen, and the steps are as follows: 310-320°C for 3 hours, 410-425°C for 7 hours, and 460-470°C for 2 hours; Then air-cool to room temperature to obt...

Embodiment 3

[0040] Take the Mg-0.4Al-0.22Ca-0.1Sn-0.1Y-0.06La alloy as an example (according to the composition mass percentage: Al: 0.4%, Ca: 0.22%, Sn: 0.1%, Y: 0.1%, La: 0.06 %, the unavoidable sum of impurities≤0.05%, and the balance is magnesium), and its preparation method is as follows:

[0041] (1) Under the protection of the commercial No. 2 flux, add pure magnesium, pure aluminum, magnesium-calcium master alloy, pure tin, magnesium-yttrium master alloy in sequence, and heat and melt at 680-730°C; then add magnesium-lanthanum Master alloy, stir evenly at 680-700°C, refine and degas and remove slag to obtain alloy liquid;

[0042] (2) casting the molten alloy obtained in step (1) into an ingot by semi-continuous casting;

[0043] (3) The ingot obtained in step (2) is subjected to stepwise homogenization heat treatment under the protection of nitrogen, and the steps are as follows: 300-320°C for 4 hours, 420-430°C for 6 hours, and 450-460°C for 3 hours; Then air-cool to room temp...

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Abstract

The invention belongs to the technical field of metal materials, and discloses a corrosion-resistant fast-extrusion magnesium alloy and a preparation method thereof; the composition mass percentage of the magnesium alloy is: aluminum: 0.1-2.0%, calcium: 0.05-0.5%, tin: 0.01‑0.5%, yttrium: 0.01‑0.45%, and the rest are magnesium, additive elements and unavoidable impurities. The additive elements are one or any combination of cerium, neodymium, and lanthanum, and the addition amount is: cerium: 0 ‑0.45%, Neodymium: 0‑0.45%, Lanthanum: 0‑0.45%. The preparation method includes: forming an atomic-scale microstructure in the magnesium alloy after alloy smelting, pouring, rapid extrusion after homogenization heat treatment, solution heat treatment and artificial aging treatment. The interaction of rare earth elements with Al, Ca and Sn atoms can regulate the size, shape, quantity and distribution of the microstructure, reduce the microgalvanic corrosion of the microstructure and the magnesium matrix, and significantly improve the corrosion resistance.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a corrosion-resistant fast-extruded magnesium alloy and a preparation method thereof. Background technique [0002] As a lightweight structural material, magnesium alloy has the advantages of high specific strength and good shock absorption, so it has broad application prospects in industries such as automobiles and aerospace. However, magnesium alloys are prone to corrosion due to the extremely high chemical and electrochemical activity of magnesium and the low equilibrium potential. Due to the poor stability of the oxide film formed on the surface of the magnesium alloy, and the impurity elements in the magnesium alloy such as iron will form galvanic corrosion with the magnesium matrix, thereby shortening the service life of the magnesium alloy and hindering the further wide application of the magnesium alloy. At present, the main ways to improve the corrosion resistance of magn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C23/02C22C1/03C22F1/06
Inventor 王慧远李美璇查敏王珵贾海龙李佳声孟昭元李宜家张凯
Owner JILIN UNIV
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