Aluminum alloy and preparation method thereof

A technology for aluminum alloys and products, applied in the field of aluminum alloys and its preparation, can solve problems such as surface yellowing, surface appearance not meeting requirements, affecting surface appearance, etc., to achieve the effect of improving strength, meeting performance requirements, and good surface appearance

Inactive Publication Date: 2016-06-15
AAC MICROTECH CHANGZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, commercial 7xxx series high-strength aluminum alloys (such as 7075, 7050, 7055, etc.) have fibrous structure stripes, surface yellowing, black lines, black spots and other phenomena during the anodizing process, which affect the surface appearance.
Therefore, if the commercial 7xxx series aluminum alloy is anodized directly as the body shell material of electronic equipment, its surface appearance does not meet the requirements

Method used

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  • Aluminum alloy and preparation method thereof
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preparation example Construction

[0035] Simultaneously, the present invention also provides a kind of preparation method of aluminum alloy, it comprises:

[0036] Step S1: weighing the raw materials, and batching according to the weight percentage of each component;

[0037] The raw materials include aluminum ingots with a purity of ≥99.99%, zinc with a purity of ≥99.99%, magnesium with a purity of ≥99.99%, and grain refiner Al-Ti-B.

[0038] Step S2: After smelting the raw materials, adopt a semi-continuous casting method to obtain ingots;

[0039] Wherein the temperature of the raw material smelting is controlled at 740-760°C. During the smelting process of the raw materials, it is necessary to analyze the chemical composition of the melt samples to make sure that the required composition range requirements are met, and if there is any deviation, make corresponding adjustments; after the raw materials become a melt, you can also add The refining agent is used for refining to eliminate gas and sundries in ...

Embodiment 1

[0045] To prepare Zn=4.42%, Mg=2.08%, Ti=0.027%, Cu=0.01%, Zr=0.01%, Cr=0.01%, Mn=0.01%, Si=0.04%, Fe=0.08%, the balance Al and incidental impurities, where the weight ratio of Zn and Mg is: Zn / Mg=2.13 aluminum alloy as an example.

[0046] First, the ingredients are prepared according to the component content, and then the raw materials aluminum ingots, zinc, and magnesium are added to the crucible after degreasing, degassing and surface oxide inclusions; the crucible is heated to 740°C, and after all the raw materials in the crucible are melted, Sampling for chemical composition analysis to make sure that the required composition range is met. If there is any deviation, make corresponding adjustments. At the same time, add refining agent for refining to eliminate gas and sundries in the melt, purify the melt, and remove After the slag is left to stand for a period of time, the grain refiner Al-Ti-B is added online for casting, and the pouring temperature is controlled at 710...

Embodiment 2

[0049] To prepare Zn=5.79%, Mg=2.12%, Ti=0.029%, Cu=0.11%, Zr=0.005%, Cr=0.005%, Mn=0.005%, Si=0.04%, Fe=0.07%, the balance Al and its accompanying impurities, where the weight ratio of Zn and Mg is: Zn / Mg=2.73 aluminum alloy as an example.

[0050] First, the ingredients are prepared according to the component content, and then the raw materials aluminum ingots, zinc, and magnesium are added to the crucible after degreasing, degassing and surface oxide inclusions; the crucible is heated to 750°C, and after all the raw materials in the crucible are melted, Sampling for chemical composition analysis to make sure that the required composition range is met. If there is any deviation, make corresponding adjustments. At the same time, add refining agent for refining to eliminate gas and sundries in the melt, purify the melt, and remove After the slag is left to stand for a period of time, the grain refiner Al-Ti-B is added online for casting, and the pouring temperature is controll...

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Abstract

The invention discloses aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by weight, 4.0%-11.0% of Zn, 2.0%-3.0% of Mg, 0-0.3% of Si, 0-0.4% of Ti, 0-0.2% of Cu, 0-0.01% of Zr, 0-0.01% of Cr, 0-0.01% of Mn, less than 0.1% of Fe and the balance Al and accessory impurities. The weight ratio of Zn to Mg is 2-6. According to the aluminum alloy, the surface appearance defects such as fibrous structure stripes and surface yellowing in the anodic oxidation treatment process of commercial 7xxx-series (such as 7075, 7050 and 7055) high-strength aluminum alloy are overcome, high strength and good anodic oxidation treatment surface appearance of the aluminum alloy are integrated, the strength of the aluminum alloy for existing electronic equipment body shells is further improved, and the requirement of electronic equipment lighting and thinning development for aluminum alloy materials for the equipment body shells is effectively met; meanwhile, the application field of the 7xxx-series high-strength aluminum alloy also can be expanded.

Description

technical field [0001] The invention relates to the field of aluminum alloy materials, in particular to an aluminum alloy and a preparation method thereof. Background technique [0002] At present, electronic equipment (such as mobile phones, tablet computers, notebook computers, electronic watches, electronic players, electronic readers, electronic displays, etc.) is showing a trend of thinning and thinning, which puts forward more requirements on the performance of the body shell materials of electronic equipment. High requirements, the material of the fuselage shell should not only have high strength, but also have a good surface appearance. As we all know, aluminum alloy has the advantages of high specific strength, good processing performance, low cost, etc., and aluminum alloy can obtain a good surface appearance through anodic oxidation surface treatment. Compared with plastic and stainless steel commonly used in electronic equipment body shell materials, anodized al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053
CPCC22C1/026C22C21/10C22F1/053
Inventor 严绪东许杰刘浩
Owner AAC MICROTECH CHANGZHOU
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