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Magnesium alloy with excellent stress corrosion resistance and preparation method thereof

A corrosion-resistant and stress-resistant technology, applied in the field of excellent stress-corrosion-resistant magnesium alloys and their preparation, can solve the problems of reduced service performance and service life, stress corrosion cracking, reduction of material tensile strength, etc., so as to improve stress corrosion resistance. performance, reducing stress concentration, increasing yield strength

Active Publication Date: 2022-06-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the coupling action of static stress and corrosive medium, magnesium alloy (including but not limited to Mg-Zn-Ca system) components in complex service environment will lead to a significant decrease in tensile strength and stress corrosion cracking, which reduces the Service performance and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take the Mg-1.5Zn-0.25Ca-0.01Bi-0.2Mn alloy as an example (according to the composition mass percentage: Zn: 1.5%, Ca: 0.25%, Bi: 0.01%, Mn: 0.2%, the total content of unavoidable impurities ≤0.02%, the balance is magnesium), and its preparation method is as follows:

[0025] (1) Under the protection of argon, add pure Mg, pure Zn, Mg-25Ca master alloy, Mg-10Bi master alloy in turn, and heat and melt at 650-720°C; then add Mg-2Mn master alloy, at 650-700 Stir evenly at ℃, after blowing air and removing slag, a uniform alloy liquid is obtained;

[0026] (2) pouring the homogeneous alloy liquid obtained in step (1) into a cast iron mold by manual casting to obtain an as-cast alloy ingot;

[0027] (3) Remove the riser from the as-cast alloy ingot obtained in step (2), and carry out gradient homogenization heat treatment under argon protection: 350°C for 1 hour, 380°C for 5 hours, 430°C for 1 hour; air-cooled to At room temperature, a homogeneous alloy ingot is obtained; ...

Embodiment 2

[0033] Take the Mg-0.5Zn-0.1Ca-0.1Mn-0.1Bi-0.1Sb alloy as an example (according to the composition mass percentage: Zn: 0.5%, Ca: 0.1%, Mn: 0.1%, Bi: 0.1%, Sb: 0.1 %, the unavoidable total impurity content≤0.02%, and the balance is magnesium), and its preparation method is as follows:

[0034] (1) Under the protection of argon, add pure Mg, pure Zn, Mg-25Ca master alloy, Mg-10Bi master alloy in turn, and heat and melt at 650-720 °C; then add Mg-2Mn master alloy, at 660-680 Stir evenly at ℃, after blowing air and removing slag, a uniform alloy liquid is obtained;

[0035] (2) pouring the homogeneous alloy liquid obtained in step (1) into a cast iron mold by manual casting to obtain an as-cast alloy ingot;

[0036] (3) Remove the riser from the as-cast alloy ingot obtained in step (2), and perform gradient homogenization heat treatment under the protection of argon: 3 hours at 330°C, 4 hours at 400°C, and 1 hour at 460°C; air cool to room temperature , to obtain a homogeneous ...

Embodiment 3

[0042] Take the Mg-0.5Zn-0.1Ca-0.1Mn-0.05Bi-0.1Er alloy as an example (according to the composition mass percentage: Zn: 0.5%, Ca: 0.1%, Mn: 0.1%, Bi: 0.05%, Er: 0.1 %, the unavoidable total impurity content≤0.02%, and the balance is magnesium), and its preparation method is as follows:

[0043] (1) Under the protection of argon, add pure Mg, pure Zn, Mg-25Ca master alloy, Mg-10Bi master alloy in sequence, and heat and melt at 650-720°C; then add Mg-2Mn master alloy, Mg-20Er master alloy For alloy, stir evenly at 660-680°C, after blowing air and removing slag, a uniform alloy liquid is obtained;

[0044] (2) pouring the homogeneous alloy liquid obtained in step (1) into a cast iron mold by manual casting to obtain an as-cast alloy ingot;

[0045] (3) Remove the riser from the as-cast alloy ingot obtained in step (2), and perform gradient homogenization heat treatment under the protection of argon: 330°C for 4 hours, 380°C for 6 hours, 460°C for 1 hour; air cool to room temper...

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Abstract

The invention belongs to the technical field of metal materials, and discloses a magnesium alloy with excellent stress corrosion resistance and a preparation method thereof. The magnesium alloy is prepared from the following components in percentage by mass: 0.05 to 2.0 percent of zinc, 0.05 to 0.5 percent of calcium, 0.001 to 0.25 percent of bismuth, less than or equal to 0.02 percent of additive elements and inevitable impurities, and the balance of magnesium, the additive element is one or any combination of erbium, tin, antimony and manganese, wherein the erbium ranges from 0.001% to 0.2%, the tin ranges from 0.001% to 0.2%, the antimony ranges from 0.001% to 0.2%, and the manganese ranges from 0.05% to 0.3%. The preparation method comprises the five steps of alloy smelting and pouring, homogenizing heat treatment, extrusion, solution treatment and artificial aging. Through the synergistic effect of alloy components and the process, the size and distribution of a second phase in the magnesium alloy are effectively regulated and controlled, grains are refined, and anode dissolution cracking caused by galvanic corrosion and mechanical cracking caused by hydrogen embrittlement are reduced; in addition, the interaction among the alloy components improves the stability and compactness of a corrosion product layer and inhibits induced cracking of the corrosion product layer, so that the stress corrosion resistance of the alloy is improved.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a magnesium alloy with excellent stress corrosion resistance and a preparation method thereof. Background technique [0002] Mg-Zn-Ca series magnesium alloys have broad application prospects in rail transportation, marine transportation, military projects and biomedicine due to their low cost, good flame retardancy and good biological safety. However, under the coupling action of static stress and corrosive medium, magnesium alloy (including but not limited to Mg-Zn-Ca system) components in complex service environment will lead to a significant decrease in tensile strength and stress corrosion cracking, which reduces the Service performance and service life. Improving the mechanical properties and corrosion resistance of alloys is an effective way to inhibit stress corrosion, but how to simultaneously improve the mechanical properties and corrosion resistance of magnesium alloys i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/04C22F1/02C22F1/06C22C1/03
CPCC22C23/00C22C23/04C22C1/03C22F1/06C22F1/02
Inventor 王大为陈长鑫王慧远查敏王珵李美璇董柯军孟昭元李宜家张迅
Owner JILIN UNIV
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