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High-strength aluminum alloy for electronic product outer parts and preparation method thereof

A technology for electronic products and aluminum alloys, applied in the field of aluminum alloy processing, can solve the problems of oxide film structure stripes, black lines, and insufficient texture, to eliminate structure stripes and mottles, improve gloss and texture, and improve oxide film. quality effect

Active Publication Date: 2019-03-19
GUANGDONG XINGFA ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Al-Zn-Mg series and Al-Zn-Mg-Cu series aluminum alloys represented by 7003, 7005, 7050, 7075 and other grades are high-strength aluminum alloys that can be strengthened by heat treatment. Although these aluminum alloys have the advantage of high strength , but the anodic oxidation effect of aluminum alloy is poor, and the oxide film is prone to defects such as structural stripes, mottled, black lines, etc., the gloss of the oxide film is reduced, and the texture is not fine enough, which cannot meet the high decorative requirements of consumers for the appearance of electronic products.

Method used

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  • High-strength aluminum alloy for electronic product outer parts and preparation method thereof

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preparation example Construction

[0043] The preparation method of the high-strength aluminum alloy for the appearance parts of electronic products according to the present invention comprises the following steps:

[0044] The first step: select aluminum ingots with a purity of 99.9%, zinc ingots with a purity of 99.9%, magnesium ingots with a purity of 99.95%, AlCu20 alloys, AlMn10 alloys, AlY5 alloys, AlTi5 alloys and AlSr5 alloys as raw materials;

[0045] The second step: Put the aluminum ingot into the melting furnace to heat and melt at 760-780°C, then add 4.5-5.5% zinc ingot, 0.8-1.0% magnesium ingot, 1.5-2.5% AlCu20 alloy, 0.5-1.5% AlMn10 alloy and 0.2-0.6% AlY5 alloy are stirred and melted into aluminum alloy liquid;

[0046] The third step: use aluminum alloy refining agent and argon to spray and refine the aluminum alloy liquid in the furnace to degas and remove impurities, remove slag and then stand still;

[0047] Step 4: Lead the aluminum alloy liquid in the furnace into the launder, and add 0.8...

Embodiment 1

[0067] The aluminum alloy is composed of the following components by mass percentage: Zn 4.8%, Mg 0.9%, Cu 0.4%, Mn 0.1%, Y 0.02%, Ti 0.05%, Sr 0.008%, Fe≤0.1%, Si≤0.1%, the balance It is Al and other unavoidable impurities, and the individual content of other impurities is ≤0.01%, and the total amount is ≤0.05%; the preparation method includes the following steps:

[0068] The first step: select aluminum ingots with a purity of 99.9%, zinc ingots with a purity of 99.9%, magnesium ingots with a purity of 99.95%, AlCu20 alloys, AlMn10 alloys, AlY5 alloys, AlTi5 alloys and AlSr5 alloys as raw materials;

[0069] The second step: Put the aluminum ingot into the melting furnace and heat it at 770°C to melt, then add 4.8% zinc ingot, 0.9% magnesium ingot, 2% AlCu20 alloy, 1% AlMn10 alloy and 0.4% AlY5 alloy, stirred and melted into aluminum alloy liquid;

[0070] Step 3: Use 0.3% aluminum alloy refining agent accounting for the total weight of raw materials and argon gas with a pu...

Embodiment 2

[0078] The aluminum alloy is composed of the following mass percentages: Zn 4.5%, Mg 1.0%, Cu 0.3%, Mn 0.15%, Y 0.01%, Ti 0.06%, Sr 0.005%, Fe≤0.1%, Si≤0.1%, remainder The amount 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:

[0079] The first step: select aluminum ingots with a purity of 99.9%, zinc ingots with a purity of 99.9%, magnesium ingots with a purity of 99.95%, AlCu20 alloys, AlMn10 alloys, AlY5 alloys, AlTi5 alloys and AlSr5 alloys as raw materials;

[0080] The second step: Put the aluminum ingot into the melting furnace to heat and melt at 760°C, and then add 4.5% zinc ingot, 1.0% magnesium ingot, 1.5% AlCu20 alloy, 1.5% AlMn10 alloy and 0.2% AlY5 alloy, stirred and melted into aluminum alloy liquid;

[0081] Step 3: Use 0.2% aluminum alloy refining agent accounting for the total weight of raw materials and argon gas with a purity ...

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Abstract

The invention discloses high-strength aluminum alloy for electronic product outer parts and a preparation method thereof. The aluminum alloy is prepared from the following components according to masspercent: 4.5 to 5.5% of Zn, 0.8 to 1.0% of Mg, 0.3 to 0.5% of Cu, 0.05 to 0.15% of Mn, 0.01 to 0.03% of Y, 0.04 to 0.06% of Ti, 0.005 to 0.01% of Sr, less than or equal to 0.1% of Fe, less than or equal to 0.1% of Si and the balance of Al and inevitable other impurities. The preparation method comprises the steps of smelting and preparing an aluminum alloy solution, performing spray refining in afurnace, performing online refinement and modification, performing online degassing and filtration, performing semicontinuous casting, homogenizing cast ingots, heating and extruding, and performingonline quenching and artificial aging. According to the high-strength aluminum alloy and the preparation method, the cleanliness of the aluminum alloy and the uniformity of tissue components are increased, Fe-enriched phases and continuous intercrystalline network MgZn2 phases are refined and modified, and the defects of black lines, black dots and the like of an oxidation film are eliminated, sothat recrystallized fine equiaxed grains are obtained by extruding the aluminum alloy, tissue stripes and piebald of the oxidation film are eliminated, and the quality of the oxidation film is increased. The aluminum alloy has the advantages of high strength, good plasticity and excellent oxidizing and coloring effects and is suitable for manufacturing outer structural parts of various electronicproducts.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a high-strength aluminum alloy for appearance parts of electronic products and a preparation method thereof. Background technique [0002] With the development of large-screen and thinner consumer electronic products such as smart phones and tablet computers, there is an urgent need for high-strength aluminum alloy backplanes, middle frames or frames to improve the bending resistance of the fuselage to prevent the fuselage from being damaged when the fuselage is under pressure. Bending, bending and other phenomena occur, and at the same time, aluminum alloys are required to have excellent oxidation and coloring effects to meet consumers' high decorative requirements for electronic product appearance parts. [0003] With the coming of the 5G communication era, due to the shielding effect of aluminum alloy on electromagnetic waves, the existing shell s...

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 陈文泗王顺成罗铭强聂德键张小青林丽荧陈树钦
Owner GUANGDONG XINGFA ALUMINUM
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