Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance and preparation method thereof

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

Active Publication Date: 2019-08-30
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance and preparation method thereof
  • Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance and preparation method thereof

Examples

Experimental program
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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 invention aims to provide an Al-Zn-Mg-Cu aluminum alloy profile with high stress corrosion resistance and a preparation method thereof. The aluminum alloy material is prepared from, by mass, smaller than or equal to 0.1% of Si, smaller than or equal to 0.1% of Fe, 0.12%-0.14% of Cu, 0.23%-0.25% of Mn, 0.75%-0.8% of Mg, 0.15%-0.17% of Cr, 5.7%-5.8% of Zn, 0.16%-0.19% of Zr, 0.02%-0.04% of Ti, wherein the ratio of Fe to Si ranges from 1.8 to 2.5, and the ratio of Zn to Mg is controlled to range from 7.1 to 7.7. The preparation method comprises the steps of smelting, refining, essence melting, casting, homogenization annealing, extruding, solid solution quenching, stress relieving and aging treatment. According to the Al-Zn-Mg-Cu aluminum alloy profile with the high stress corrosion resistance and the preparation method thereof, the material shows good mechanical strength and stress corrosion resistance, and the material is especially suitable for aluminum alloy structural members which are prone to stress corrosion and failure, in particular to aluminum alloy structural members subjected to tensile stress at the bottom of a rail transit or a vehicle 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 Applications(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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