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High-strength and corrosion-resistant aluminum alloy and preparation method thereof

A corrosion-resistant aluminum alloy and aluminum alloy technology, applied in the field of metal material engineering, can solve problems such as failure and achieve excellent corrosion resistance

Inactive Publication Date: 2017-09-01
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this alloy product often fails due to stress corrosion cracking (SCC) during its service, and the contradiction between SCC sensitivity and strength is still a major problem in the industrial application of 7000 series aluminum alloys.

Method used

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  • High-strength and corrosion-resistant aluminum alloy and preparation method thereof
  • High-strength and corrosion-resistant aluminum alloy and preparation method thereof
  • High-strength and corrosion-resistant aluminum alloy and preparation method thereof

Examples

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Embodiment 1

[0034] A high-strength corrosion-resistant aluminum alloy, the composition and weight percentage of the aluminum alloy are: 10.12% Zn, 2.04% Mg, 2.10% Cu, 0.12% Zr, 0.08% Ce, 0.035% Fe, Si It is 0.032%, and the balance is Al and other impurities whose content is less than 0.05%.

[0035] The preparation method of the high-strength corrosion-resistant aluminum alloy of the present embodiment comprises the following steps:

[0036] (1) Add aluminum, zinc, copper source, zirconium source and cerium source to the smelting furnace in sequence according to the ratio and smelt at 770°C. After complete melting, go through argon degassing treatment, and then add magnesium (including the amount of burning loss, burning The amount of loss is 3% of the added amount of magnesium), and after complete melting, the molten alloy is obtained by argon degassing again, and left to stand for 1 hour; wherein, aluminum is high-purity aluminum with an aluminum content of 99.95%, zinc is pure zinc, an...

Embodiment 2-4

[0044] The composition and preparation method of the high-strength corrosion-resistant aluminum alloy in Examples 2-4 are the same as those in Example 1, but the parts by weight of each component in the composition are different. See Table 2 for specific data.

[0045] Table 2: Parts by weight (weight percent wt%) of aluminum alloy components in the examples

[0046]

[0047]

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Abstract

The invention discloses a high-strength and corrosion-resistant aluminum alloy. The aluminum alloy comprises the components, by weight, of 9.8%-11.5% of Zn, 1.7%-2.5% of Mg, 1.8%-2.8% of Cu, 0.08%-0.18% of Zr, 0.05%-0.15% of Ce and the balance Al and impurities, wherein the total content of the impurities is not more than 0.08%, and the content of each single impurity is not more than 0.04%. A preparation method of the high-strength and corrosion-resistant aluminum alloy comprises the following steps of (1) smelting, (2) pouring, (3) two-stage homogenization treatment, (4) head cutting and surface milling, (5) hot rolling, intermediate annealing and cold rolling, (6) two-stage solid solution treatment and quenching, and (7) aging treatment. The room temperature tensile strength of the aluminum alloy prepared by the preparation method is more than 700 MPa, and meanwhile, the excellent corrosion resistance is achieved.

Description

technical field [0001] The invention belongs to the field of metal material engineering, and in particular relates to an aluminum alloy and a preparation method thereof. Background technique [0002] Al-Zn-Mg-Cu superhard series (7000 series) aluminum alloy is an alloy that can be strengthened by heat treatment. It has the characteristics of low density, good processability and excellent welding performance. One of the most important lightweight structural materials in fields such as vehicles. However, this alloy product often fails due to stress corrosion cracking (SCC) during its service, and the contradiction between SCC sensitivity and strength is still a major problem in the industrial application of 7000 series aluminum alloys. In order to solve this problem, scholars at home and abroad have optimized the alloy composition, such as continuously increasing the zinc-magnesium ratio, reducing the total content of magnesium and copper, reasonably introducing trace element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/002C22F1/053
Inventor 尹登峰程仁策吕正风王华余鑫祥
Owner CENT SOUTH UNIV