High-strength corrosion resistant Al-Zn-Mg series aluminum alloy and preparation method thereof

An aluminum alloy and anti-corrosion technology, which is applied in the field of high-strength, toughness, anti-corrosion Al-Zn-Mg series aluminum alloys and its preparation, can solve problems such as fracture toughness and corrosion resistance limitations, and achieve excellent corrosion resistance and high fracture toughness , Improve the effect of fracture toughness and corrosion resistance

Active Publication Date: 2018-07-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology cannot make the Al-Zn-Mg aluminum alloy obtain a complete fibrous structure along the extrusion direction, so that the improvement of fracture toughness and corrosion resistance is still relatively limited.
Therefore, the existing Al-Zn-Mg series aluminum alloys and their preparation methods still need to be improved and developed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The method for preparing the high-strength, corrosion-resistant Al-Zn-Mg aluminum alloy of the present invention is characterized by including the following steps:

[0029] The first step: select Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B alloy wire and aluminum ingot with purity of 99.7%, zinc ingot with purity of 99.9%, purity 99.9% magnesium ingot as raw material;

[0030] Step 2: Heat and melt the aluminum ingot at 770~780℃, and then add 5.6~5.9% of the total weight of the raw material zinc ingot, 0.5~0.8% of magnesium ingot, 1.5~2.5% of Al-20Cu alloy, 2~ 3% Al-20Mn alloy, 2~3% Al-10Cr alloy and 2~3% Al-10Er alloy, stir and melt into aluminum alloy liquid;

[0031] The third step: spray refining the aluminum alloy liquid in the furnace with hexachloroethane refining agent for 10-15 minutes, and then stand for 30-40 minutes after slagging;

[0032] Step 4: Introduce the aluminum alloy liquid in the furnace into the launder, and add 0.4-0.6% of the...

Embodiment 1

[0045] Aluminum alloy is composed of the following components by mass percentage: Zn 5.6%, Mg 0.8%, Cu 0.5%, Mn 0.4%, Cr 0.2%, Er 0.2%, Ti 0.03%, B 0.006%, Fe≤0.15%, Si≤0.1 %, the balance is Al and other unavoidable impurities, the individual content of unavoidable other impurities is ≤0.05%, and the total amount is ≤0.15%; the preparation method includes the following steps:

[0046] The first step: select Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B alloy wire and aluminum ingot with purity of 99.7%, zinc ingot with purity of 99.9%, purity 99.9% magnesium ingot as raw material;

[0047] Step 2: Heat and melt the aluminum ingot at 770℃, and then add 5.6% zinc ingot, 0.8% magnesium ingot, 2.5% Al-20Cu alloy, 2% Al-20Mn alloy, 2% of the total weight of raw materials. Al-10Cr alloy and 2% Al-10Er alloy are stirred and melted into aluminum alloy liquid;

[0048] The third step: use 0.5% of the total weight of raw materials to spray and refine the aluminum allo...

Embodiment 2

[0056] The aluminum alloy is composed of the following mass percentage components: Zn 5.8%, Mg 0.6%, Cu 0.4%, Mn 0.5%, Cr0.25%, Er 0.25%, Ti 0.02%, B 0.004%, Fe≤0.15%, Si≤ 0.1%, the balance is Al and other unavoidable impurities, the individual content of unavoidable other impurities is ≤0.05%, and the total amount is ≤0.15%; the preparation method includes the following steps:

[0057] The first step: select Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B alloy wire and aluminum ingot with purity of 99.7%, zinc ingot with purity of 99.9%, purity 99.9% magnesium ingot as raw material;

[0058] Step 2: Heat and melt the aluminum ingot at 775℃, and then add 5.8% zinc ingot, 0.6% magnesium ingot, 2% Al-20Cu alloy, 2.5% Al-20Mn alloy, 2.5% of the total weight of raw materials. Al-10Cr alloy and 2.5% Al-10Er alloy are stirred and melted into aluminum alloy liquid;

[0059] The third step: use 0.5% of the total weight of the raw materials to spray and refine the alu...

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Abstract

The invention discloses a high-strength corrosion resistant Al-Zn-Mg series aluminum alloy and a preparation method of the high-strength corrosion resistant Al-Zn-Mg series aluminum alloy, the aluminum alloy comprises main alloy elements of Zn, Mg and Cu and microalloying elements of Mn, Cr, Er, Ti and B, others are Al and inevitable impurity elements. The preparation method of the high-strength corrosion resistant Al-Zn-Mg series aluminum alloy comprises melting an aluminum alloy solution, spraying, blowing and refining in a furnace, refining a grain online, degassing and filtering online, casting semi-continuously, homogenizing a cast ingot, heating, extruding, quenching online, and implementing artificial ageing treatment. The ingredient composition and the preparation process of the alloy are optimized and designed, the recrystallization and the grain growth are controlled, so that a fibrous crystal tissue is acquired by processing the Al-Zn-Mg series aluminum alloy in the extruding direction, the breaking tenacity and the corrosion resistance of an aluminum alloy extruding material are improved, the aluminum alloy extruding material has excellent comprehensive performances andis suitable for manufacturing light-weight aluminum materials of transportation means like automobiles, railway vehicles, ships and airplanes.

Description

Technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and specifically relates to a high-strength, corrosion-resistant Al-Zn-Mg aluminum alloy and a preparation method thereof. Background technique [0002] With the development of lightweight vehicles, rail vehicles, ships, airplanes and other transportation tools, the application of aluminum alloys in transportation tools is expanding. Transportation vehicles have higher requirements for the comprehensive performance of aluminum alloys, such as high strength, fracture toughness and corrosion resistance, to improve the safety, impact resistance and durability of transportation vehicles. Al-Zn-Mg series aluminum alloys are high-strength aluminum alloys that can be strengthened by heat treatment. Although they have the advantages of high strength, they generally have insufficient fracture toughness and greater corrosion sensitivity when used in transportation vehicles. The main reasons a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22C1/06C22F1/053
CPCC22C1/026C22C1/03C22C1/06C22C21/10C22F1/053
Inventor 王顺成周楠李盛峰张会
Owner GUANGDONG INST OF NEW MATERIALS
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