Fine equiaxed grain Al-Zn-Mg series aluminum alloy and preparation method thereof

A technology of equiaxed grains and aluminum alloys, which is applied in the field of axial grain Al-Zn-Mg series aluminum alloys and its preparation, can solve the problems of inability to meet the high decorative requirements of consumers, the texture of the aluminum oxide film is not fine enough, and the oxidation Poor coloring effect and other problems, to achieve excellent oxidation coloring effect, high-strength oxidation coloring effect, and improve cleanliness

Active Publication Date: 2018-07-06
GUANGDONG INST OF NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Al-Zn-Mg series aluminum alloy represented by 7003 alloy is a high-strength aluminum alloy that can be strengthened by heat treatment. Although it has the advantage of high strength, the oxidation coloring effect is poor, and the oxide film often has defects such as structure stripes and color difference. As a result, the texture of the aluminum alloy oxide film is not fine enough, the gloss is low, and the coloring effect is poor, which cannot meet the high decorative requirements of consumers for the appearance of electronic products.
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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  • Fine equiaxed grain Al-Zn-Mg series aluminum alloy and preparation method thereof

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preparation example Construction

[0029] The preparation method of fine equiaxed grain Al-Zn-Mg series aluminum alloy of the present invention is characterized in comprising the following steps:

[0030] The first step: select aluminum ingots with a purity of 99.85%, zinc ingots with a purity of 99.9%, magnesium ingots with a purity of 99.9%, Al-10Cu alloy and Al-5Ti-1B alloy wire as raw materials;

[0031] Step 2: Heat and melt the aluminum ingot at 770-780°C, then add 5.6-5.9% zinc ingot, 0.5-0.8% magnesium ingot and 3-5% Al-10Cu alloy accounting for the total weight of raw materials, stir and melt Aluminum alloy liquid;

[0032] Step 3: Use argon with a purity of 99.9% to spray and refine the aluminum alloy liquid in the furnace for 10 to 15 minutes, and then stand still for 30 to 40 minutes after removing the slag;

[0033] Step 4: Lead the aluminum alloy liquid in the furnace into the launder, add Al-5Ti-1B alloy wire accounting for 0.1-0.2% of the total weight of the raw materials into the aluminum alloy ...

Embodiment 1

[0047] Al-Zn-Mg series aluminum alloy is composed of the following mass percentages: Zn 5.6%, Mg 0.8%, Cu 0.3%, Ti0.005%, B 0.001%, Fe≤0.12%, Si≤0.1%, and the balance is Al and other unavoidable impurities, the individual content of other impurities is ≤0.01%, and the total amount is ≤0.05%; the preparation method includes the following steps:

[0048] The first step: select aluminum ingots with a purity of 99.85%, zinc ingots with a purity of 99.9%, magnesium ingots with a purity of 99.9%, Al-10Cu alloy and Al-5Ti-1B alloy wire as raw materials;

[0049] Step 2: Heat and melt the aluminum ingot at 780°C, then add 5.6% zinc ingot, 0.8% magnesium ingot and 3% Al-10Cu alloy to the total weight of the raw materials, stir and melt to form an aluminum alloy liquid;

[0050] Step 3: Use argon with a purity of 99.9% to spray and refine the aluminum alloy liquid in the furnace for 15 minutes, and then stand still for 30 minutes after removing slag;

[0051] Step 4: Lead the aluminum ...

Embodiment 2

[0058] Al-Zn-Mg series aluminum alloy is composed of the following mass percentages: Zn 5.7%, Mg 0.8%, Cu 0.4%, Ti0.0075%, B 0.0015%, Fe≤0.12%, Si≤0.1%, and the balance is Al and other unavoidable impurities, the individual content of other impurities is ≤0.01%, and the total amount is ≤0.05%; the preparation method includes the following steps:

[0059] The first step: select aluminum ingots with a purity of 99.85%, zinc ingots with a purity of 99.9%, magnesium ingots with a purity of 99.9%, Al-10Cu alloy and Al-5Ti-1B alloy wire as raw materials;

[0060] Step 2: Heat and melt the aluminum ingot at 775°C, then add 5.7% zinc ingot, 0.8% magnesium ingot and 4% Al-10Cu alloy to the total weight of the raw materials, stir and melt to form an aluminum alloy liquid;

[0061] Step 3: Use argon gas with a purity of 99.9% to spray and refine the aluminum alloy liquid in the furnace for 12 minutes, and then stand still for 35 minutes after removing slag;

[0062] Step 4: Lead the alu...

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Abstract

The invention discloses a fine equiaxed grain Al-Zn-Mg series aluminum alloy and a preparation method thereof. The aluminum alloy comprises elements Zn, Mg, Cu, Ti, B, and the balance Al and inevitable impurity elements. The preparation method comprises the steps of preparing materials, smelting aluminum alloy, spray blowing refining in a furnace, online grain refining, online degassing filtering,semicontinuous casting, ingot casting homogenizing, heating and extruding, online quenching and manual ageing treatment. According to the fine equiaxed grain Al-Zn-Mg series aluminum alloy and the preparation method thereof, the components of the alloy and the preparation technology parameters are optimally designed, so that an Al-Zn-Mg series aluminum alloy extruding material gains a completely-recrystallized fine and uniform equiaxed grain structure; the structure stripes and color difference of an oxide film are removed, and thus the quality of the oxide film of the Al-Zn-Mg series aluminum alloy can be improved; the oxide film is uniform in color, fine in texture, high in glossiness, outstanding in coloring effect, and applicable to manufacturing of various aluminum alloy sheets or tube-bar sections with high requirements on intensity and surface decoration, such as housings, intermediate frames and side frames of various large-screen electronic products.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and in particular relates to a fine equiaxed grain Al-Zn-Mg series aluminum alloy and a preparation method thereof. Background technique [0002] With the development of large-screen and thinner electronic products such as smartphones, tablet computers, LCD screens, and smart TVs, there is an urgent need for high-strength aluminum alloy casings, middle frames or frames to improve the bending resistance of the fuselage to avoid machine When the body is under pressure, there are phenomena such as bending and bending. At the same time, aluminum alloys are required to have excellent oxidation and coloring effects to meet consumers' high decorative requirements for the appearance of electronic products. At present, the aluminum alloys used for housings, middle frames or frames of electronic products are mainly Al-Mg-Si aluminum alloys represented by 6063 alloys. Al-Mg-Si series alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/053
Inventor 王顺成周楠孙江勇王蕾
Owner GUANGDONG INST OF NEW MATERIALS
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