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Preparation method for aluminum alloy shell and aluminum alloy shell

An aluminum alloy, aluminum alloy-based technology, applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of low brightness on the surface of aluminum alloy shells, and achieve good color effects, excellent appearance quality, and brightness high effect

Active Publication Date: 2016-04-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an aluminum alloy shell and its preparation method for the problem of low surface brightness of the aluminum alloy shell prepared by the method in the prior art

Method used

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Examples

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preparation example Construction

[0016] The preparation method of the aluminum alloy casing provided by the present invention comprises the following steps:

[0017] S1. Perform sandblasting treatment on the surface of the aluminum alloy substrate; the pressure of the sandblasting treatment is 0.18-0.25MPa, and the particle size of the sand material is 80-205 mesh;

[0018] S2. Carrying out chemical polishing treatment on the surface of the sandblasted aluminum alloy substrate; the chemical polishing treatment method is: at 90-100° C., polishing with polishing solution for 15-20 s;

[0019] S3. Perform anodic oxidation treatment on the surface of the chemically polished aluminum alloy substrate; the anodic oxidation treatment method is: under the conditions of 18-20°C and a voltage of 13-16V, in the presence of 180-200g / L sulfuric acid In the anodic oxidation electrolyte, anodic oxidation treatment is performed to obtain an anodic oxidation film with a thickness of 10-20 μm;

[0020] S4, polishing the surfac...

Embodiment 1

[0043] This embodiment is used to illustrate the aluminum alloy casing disclosed in the present invention and the preparation method thereof.

[0044] Using sand with a particle size of 180 mesh, the surface of the aluminum alloy substrate was sandblasted under a pressure of 0.20 MPa. The distance between the spray gun and the surface of the aluminum alloy substrate was 15 cm, and the feed rate was 1 m / min.

[0045] Then, the aluminum alloy substrate was alkali-etched in a 50 g / L sodium hydroxide solution at 55 °C for 20 s. Then, at 25°C, neutralization treatment was carried out in a nitric acid solution with a concentration of 20ml / L for 30s.

[0046] The aluminum alloy substrate was chemically polished for 15s using a mixed polishing solution with a mass ratio of phosphoric acid and sulfuric acid at 100°C of 3:1.

[0047] Then, the aluminum alloy substrate was neutralized in a nitric acid solution with a concentration of 20 ml / L at 25° C. for 20 s.

[0048] The chemically ...

Embodiment 2

[0053] This embodiment is used to illustrate the aluminum alloy casing disclosed in the present invention and the preparation method thereof.

[0054] Using sand with a particle size of 205 mesh, the surface of the aluminum alloy substrate was sandblasted under a pressure of 0.20 MPa. The distance between the spray gun and the surface of the aluminum alloy substrate was 35 cm, and the feed rate was 1 m / min.

[0055] Then, the aluminum alloy substrate was alkali-etched in a 58 g / L sodium hydroxide solution at 55 °C for 10 s. Then, at 25°C, neutralization treatment was carried out in a 30ml / L nitric acid solution for 20s.

[0056] The aluminum alloy substrate was chemically polished for 20s using a mixed polishing solution with a mass ratio of phosphoric acid and sulfuric acid at 95°C of 3:1.

[0057] Then, the aluminum alloy substrate was neutralized in a 30ml / L nitric acid solution at 25°C for 10s.

[0058] The chemically polished aluminum alloy substrate was anodized for 40...

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Abstract

In order to overcome the problem that an aluminum alloy shell obtained by a method in the prior art is low in surface brightness, the invention provides a preparation method for the aluminum alloy shell. The preparation method comprises the following steps: S1, carrying out sand blasting treatment, wherein pressure intensity for sand blasting treatment is 0.18-0.25MPa, and the grain size of sand aggregates is 80-205 meshes; S2, carrying out chemical polishing treatment: at a temperature of 90-100 DEG C, adopting a polishing solution to polish for 15-20 seconds; S3, carrying out anodic oxidation treatment: carrying out the anodic oxidation treatment in an anodic oxidation electrolyte comprising 180-200g / L sulfuric acid at a temperature of 18-20 DEG C under a voltage of 13-16V, thereby obtaining an anode oxidation film with a thickness of 10-20 mu m; and S4: carrying out polishing treatment on the surface of the anodic oxidation film. The invention further discloses the aluminum alloy shell prepared by the method. The aluminum alloy shell prepared by the method is high in surface brightness, has various decorative effects, and is good in appearance quality.

Description

technical field [0001] The invention relates to a method for preparing a metal shell, in particular to a method for preparing an aluminum alloy shell and the aluminum alloy shell prepared by the method. Background technique [0002] At present, the use of various electronic products is becoming more and more popular. Wherein, the casing of the electronic product is usually made of aluminum alloy. In order to meet the demand for the appearance decoration effect of the shell of electronic products, the research on the appearance performance of the aluminum alloy shell is more and more extensive. [0003] In order to achieve a good appearance effect, the following methods are used in the prior art to improve the surface brightness of the aluminum alloy shell: 1. Mechanically polish the surface of the aluminum alloy substrate, and then perform wax removal, chemical polishing, neutralization, anodic oxidation, and dyeing and sealing; 2. Carry out cloth wheel polishing on the su...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/16C25D11/18
Inventor 廖重重陈梁李爱华
Owner BYD CO LTD
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