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High strength aluminum alloy for electronic product shell and preparation method of high strength aluminum alloy

An electronic product and aluminum alloy technology, which is applied in the field of aluminum alloy processing, can solve problems such as high cost, failure to meet consumers' requirements for electronic product appearance decoration, and gray oxide film, so as to inhibit grain growth and improve oxidation. Coloring effect, de-inhibition effect

Active Publication Date: 2017-12-08
GUANGDONG HOSHION IND ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the traditional 6000 series aluminum alloy has excellent extrusion processing performance and oxidation coloring effect, its strength is generally low
The 7000 series aluminum alloy is a high-strength aluminum alloy that can be strengthened by heat treatment, but there are generally problems such as extrusion processing difficulties, complex processing procedures, high cost (such as off-line solid solution), and high quenching sensitivity. When used in electronic product casings, there are still problems. The problem of poor oxidation coloring effect, such as graying and darkening of the oxide film, and defects such as stripes, black lines, mottled spots, and color difference on the surface after electrolytic coloring, cannot meet consumers' requirements for the appearance and decoration of electronic products
Therefore, the existing 7000 series aluminum alloys and their preparation methods still need to be improved and developed.

Method used

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  • High strength aluminum alloy for electronic product shell and preparation method of high strength aluminum alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. The chemical composition of high-strength aluminum alloys for electronic product casings is calculated by mass percentage: Zn 6.18%, Mg 1.32%, Cu 0.12%, Ti 0.015%, B 0.0007%, Fe<0.06%, Si<0.06%, and the rest The amount is Al and other unavoidable impurities; wherein, the individual content of other unavoidable impurities is <0.01%, and the total amount of other unavoidable impurities is <0.05%.

[0054] 2. The preparation method of the high-strength aluminum alloy for the housing of the electronic product comprises the following steps:

[0055] The first step: select aluminum ingots with a purity of ≥99.9%, zinc ingots with a purity of ≥99.95%, magnesium ingots with a purity of ≥99.95%, and Al-20Cu alloys, Al-5Ti-0.2B alloy rods (grain refiners) as raw materials;

[0056] Step 2: Heat and melt the aluminum ingot at 740-745°C, add 6.18% zinc ingot, 1.32% magnesium ingot and 0.12% Al-20Cu alloy accounting for the total weight of the raw materials, stir and melt to for...

Embodiment 2

[0066] 1. The chemical composition of high-strength aluminum alloys for electronic product casings is calculated by mass percentage: Zn 6.8%, Mg 1.24%, Cu 0.35%, Ti 0.029%, B 0.0012%, Fe<0.08%, Si<0.04%, and the rest The amount is Al and other unavoidable impurities; wherein, the individual content of other unavoidable impurities is <0.01%, and the total amount of other unavoidable impurities is <0.05%.

[0067] 2. The preparation method of the high-strength aluminum alloy for the housing of the electronic product comprises the following steps:

[0068] The first step: select aluminum ingots with a purity of ≥99.9%, zinc ingots with a purity of ≥99.95%, magnesium ingots with a purity of ≥99.95%, and Al-20Cu alloys, Al-5Ti-0.2B alloy rods (grain refiners) as raw materials;

[0069] The second step: heating and melting the aluminum ingot at 760°C, adding 6.8% zinc ingot, 1.24% magnesium ingot and 0.35% Al-20Cu alloy accounting for the total weight of raw materials, stirring and...

Embodiment 3

[0078] 1. The chemical composition of high-strength aluminum alloys for electronic product casings is Zn 6.5%, Mg 1.6%, Cu 0.25%, Ti 0.020%, B 0.0010%, Fe<0.10%, Si<0.06%, and the balance It is Al and other unavoidable impurities; wherein, the individual content of other unavoidable impurities is <0.01%, and the total amount of other unavoidable impurities is <0.05%.

[0079] 2. The preparation method of the high-strength aluminum alloy for the housing of the electronic product comprises the following steps:

[0080] The first step: select aluminum ingots with a purity of ≥99.9%, zinc ingots with a purity of ≥99.95%, magnesium ingots with a purity of ≥99.95%, and Al-20Cu alloys, Al-5Ti-0.2B alloy rods (grain refiners) as raw materials;

[0081] Step 2: Heat and melt the aluminum ingot at 750-755°C, add 6.5% zinc ingot, 1.6% magnesium ingot and 0.25% Al-20Cu alloy accounting for the total weight of raw materials, stir and melt to form aluminum alloy liquid;

[0082] The third...

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Abstract

The invention discloses a high strength aluminum alloy for an electronic product shell and a preparation method of the high strength aluminum alloy. The alloy comprises, by mass percentage, 6.1-6.8% of Zn, 1.1-1.7% of Mg, 0.1-0.5% of Cu, 0.015-0.03% of Ti, 0.0006-0.0012% of B, smaller than 0.1% of Fe, smaller than 0.1% of Si and the balance Al and other inevitable impurities, wherein the mass sum of Zn, Mg and Cu is: 7.5%<=Zn+Mg+Cu<=8.4%, the single content of the other inevitable impurities is smaller than 0.01%, and the total amount is smaller than 0.05%. The aluminum alloy prepared through the preparation method has high strength, good extruding and machining performance, low quenching sensitiveness and good oxidizing coloring effect, can meet the requirement of the portal electronic product shell for the high strength aluminum alloy, and has wide application prospects.

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 electronic product shells and a preparation method thereof. Background technique [0002] With the widespread application of portable electronic products such as smart phones, tablet computers, and notebook computers, consumers have higher and higher requirements for the appearance quality of electronic products. With the development of large-screen and thinner electronic products, there is an urgent need for higher-strength aluminum alloy shells to improve the compression and bending resistance of the fuselage, so as to avoid bending and bending of the fuselage. [0003] Although the traditional 6000 series aluminum alloy has excellent extrusion processing performance and oxidation coloring effect, its strength is generally low. The 7000 series aluminum alloy is a high-strength aluminum alloy that can be strengthe...

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 丁小理李建湘罗杰刘经发周旺王顺成
Owner GUANGDONG HOSHION IND ALUMINUM CO LTD
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