High stress corrosion resistance al-zn-mg-cu aluminum alloy profiles and preparation method thereof

An aluminum alloy profile and stress corrosion technology, applied in the field of metal materials and their processing, can solve problems affecting train operation safety, harsh service environment, stress corrosion cracking, etc., to improve corrosion resistance, improve surface quality, and reduce cracks tendentious effect

Active Publication Date: 2021-04-13
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the electrical cabinet of the train is exposed at the bottom of the train without any protection measures, and the service environment is particularly harsh
Train electrical cabinets are mainly affected by tensile stress, and are prone to stress corrosion cracking during service. Stress corrosion behavior is difficult to detect and eliminate by conventional detection methods before cracks and fractures occur. Once stress corrosion cracking occurs, electrical cabinets The body is very likely to fall off, seriously affecting the safety of train operation

Method used

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  • High stress corrosion resistance al-zn-mg-cu aluminum alloy profiles and preparation method thereof
  • High stress corrosion resistance al-zn-mg-cu aluminum alloy profiles and preparation method thereof

Examples

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Comparison scheme
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Embodiment 1

[0042]In Example 1 of the present invention, the mass percentage of each element of the chemical composition of the aluminum alloy is shown in Table 1, and the manufacturing method includes the following: (1) adding industrial-grade aluminum ingots with a purity of 99.70% or more and various required alloying elements for melting, melting The temperature is 740°C~760°C; the raw materials are fully melted to obtain a melt with uniform and stable composition. (2) The temperature of the molten aluminum is kept at 730~760°C, the melt is refined, the slag inclusions are removed, and the alloy composition content is adjusted. (3) Degassing and filtering the melt, the hydrogen content of the melt after degassing is 0.086ml / 100gAl. (4) Cast the melt after degassing and slag removal, and control the temperature of the molten aluminum on the casting platform at 690~710°C. (5) Carry out homogenization annealing treatment on the ingot, homogenization annealing process: 360°C±5°C / 3.5h+420...

Embodiment 2

[0045] In Example 2 of the present invention, the mass percentage of each element of the chemical composition of the aluminum alloy is shown in Table 1, and the manufacturing method includes the following: (1) adding industrial-grade aluminum ingots with a purity of 99.70% or more and various required alloy elements for melting, melting The temperature is 740~760°C to fully melt the raw materials and obtain a melt with uniform and stable composition. (2) The temperature of the molten aluminum is kept at 730~760°C, the melt is refined, the slag inclusions are removed, and the alloy composition content is adjusted. (3) Degassing and filtering the melt, the hydrogen content of the melt after degassing is 0.082ml / 100gAl. (4) Cast the melt after degassing and slag removal, and control the temperature of the molten aluminum on the casting platform at 690~710°C. (5) Perform homogenization annealing treatment on the ingot, homogenization annealing process: 360°C±5°C / 4h+420°C±5°C / 7h+4...

Embodiment 3

[0048] In Example 3 of the present invention, the mass percentage of each element of the chemical composition of the aluminum alloy is shown in Table 1, and the manufacturing method includes the following: (1) adding industrial-grade aluminum ingots with a purity of 99.70% or more and various required alloy elements for melting, melting The temperature is 740~760°C to fully melt the raw materials and obtain a melt with uniform and stable composition. (2) The temperature of the molten aluminum is kept at 730~760°C, the melt is refined, the slag inclusions are removed, and the alloy composition content is adjusted. (3) The melt is degassed and filtered, and the hydrogen content of the melt after degassing is 0.085ml / 100gAl. (4) Cast the melt after degassing and slag removal, and control the temperature of the molten aluminum on the casting platform at 690~710°C; (5) Perform homogenization annealing treatment on the ingot, homogenization annealing process: 360°C±5°C / 4h+420℃±5℃ / ...

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Abstract

The object of the present invention is to provide a high stress corrosion resistance Al-Zn-Mg-Cu aluminum alloy profile and a preparation method thereof. In terms of mass percentage, the aluminum alloy material includes the following elemental components: Si≤0.1%, Fe≤ 0.1%, Cu=0.12~0.14%, Mn=0.23~0.25%, Mg=0.75~0.8%, Cr=0.15~0.17%, Zn=5.7~5.8%, Zr=0.16~0.19%, Ti=0.02~0.04 %, the Fe / Si ratio is 1.8~2.5, and the Zn / Mg ratio is controlled at 7.1‑7.7. The preparation method includes smelting, refining, essence melting, casting, homogenizing annealing, extrusion, solution quenching, stress relief and aging treatment. Through the present invention, the material can exhibit better mechanical strength and stress corrosion resistance, and is especially suitable for aluminum alloy structural parts that are prone to stress corrosion and fail, especially rail transit or aluminum alloy structural parts that are subject to tensile stress at the bottom of the car body .

Description

technical field [0001] The invention belongs to the technical field of metal materials and processing thereof, and relates to a highly stress-corrosion-resistant Al-Zn-Mg-Cu aluminum alloy profile and a preparation method thereof. Background technique [0002] With the rapid development of China's high-speed rail, train sets are subjected to complex motion loads during their service. High-speed EMUs may also run in a wide range and across regions for a long time, and the service environment changes greatly. Among them, the electrical cabinet of the train is exposed at the bottom of the train without any protection measures, and the service environment is particularly harsh. Train electrical cabinets are mainly affected by tensile stress, and are prone to stress corrosion cracking during service. Stress corrosion behavior is difficult to detect and eliminate by conventional detection methods before cracks and fractures occur. Once stress corrosion cracking occurs, electrical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/002C22F1/053
Inventor 周伟莫宇飞向晶兰天虹白文全卢刚张伟东陈冠希黄金宁饶庆东
Owner 广西南南铝加工有限公司
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