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Surface treatment method of 3C product aluminum alloy outer parts and application

A surface treatment, aluminum alloy technology, applied in the direction of surface reaction electrolytic coating, anodizing, electrolytic coating, etc., can solve the problems of poor permeability of oxide film, difficult to obtain color, low gloss and so on

Inactive Publication Date: 2019-10-08
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfuric acid anodizing is currently a commonly used anodizing process for aluminum alloy appearance parts of 3C products. It has the advantages of simple oxidizing solution composition, easy operation, porous oxide film, and strong adsorption capacity. However, the oxide film generally has poor permeability, low gloss and Insufficient compactness and other problems make it difficult to obtain various bright colors for aluminum alloy appearance parts of 3C products, and at the same time obtain excellent wear resistance and corrosion resistance
Therefore, the surface treatment methods of the existing 3C product aluminum alloy appearance parts still need to be improved and developed.

Method used

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  • Surface treatment method of 3C product aluminum alloy outer parts and application
  • Surface treatment method of 3C product aluminum alloy outer parts and application
  • Surface treatment method of 3C product aluminum alloy outer parts and application

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A method for surface treatment of an aluminum alloy backplane for a smart phone, the process flow of which is as follows figure 1 shown, including the following steps:

[0051] (1) Mechanically polish the surface of the aluminum alloy backplane of the smartphone to remove the processing knife marks, burrs, scratches, etc. on the surface to obtain a smooth surface;

[0052] (2) Put the aluminum alloy backplane of the smart phone into a degreasing solution at 85° C. for 8 minutes to remove the oil on the surface. The degreasing solution is a mixed aqueous solution of sodium carbonate, sodium phosphate and sodium citrate, and the concentration of sodium carbonate is 70g / L, sodium phosphate concentration is 35g / L, sodium citrate concentration is 12g / L;

[0053] (3) Put the cleaned aluminum alloy back panel of the smart phone into an alkaline washing solution at 30°C for alkaline cleaning for 2.5 minutes to remove the natural oxide film on the surface. The alkaline solution...

Embodiment 2

[0060] A method for surface treatment of an aluminum alloy backplane for a smart phone, comprising the steps of:

[0061] (1) Mechanically polish the surface of the aluminum alloy backplane of the smartphone to remove the processing knife marks, burrs, scratches, etc. on the surface to obtain a smooth surface;

[0062] (2) Put the aluminum alloy backplane of the smart phone into the degreasing solution at 80°C for 8 minutes to remove the oil on the surface. The degreasing solution is a mixed aqueous solution of sodium carbonate, sodium phosphate and sodium citrate, and the concentration of sodium carbonate is 80g / L, the concentration of sodium phosphate is 30g / L, and the concentration of sodium citrate is 15g / L;

[0063] (3) Put the cleaned aluminum alloy backplane of the smart phone into an alkaline solution at 30°C for alkaline cleaning for 2 minutes to remove the natural oxide film on the surface. The alkaline solution is a mixed aqueous solution of sodium hydroxide and sodiu...

Embodiment 3

[0070] A method for surface treatment of an aluminum alloy backplane for a smart phone, comprising the steps of:

[0071] (1) Mechanically polish the surface of the aluminum alloy backplane of the smartphone to remove the processing knife marks, burrs, scratches, etc. on the surface to obtain a smooth surface;

[0072] (2) Put the aluminum alloy backplane of the smartphone into a degreasing solution at 90°C for 7 minutes to remove the oil on the surface. The degreasing solution is a mixed aqueous solution of sodium carbonate, sodium phosphate and sodium citrate, and the concentration of sodium carbonate is 60g / L, the concentration of sodium phosphate is 40g / L, and the concentration of sodium citrate is 10g / L;

[0073] (3) Put the cleaned aluminum alloy backplane of the smart phone into an alkaline solution at 25°C for alkaline cleaning for 2 minutes to remove the natural oxide film on the surface. The alkaline solution is a mixed aqueous solution of sodium hydroxide and sodium...

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Abstract

The invention provides a surface treatment method of 3C product aluminum alloy outer parts. The method comprises following steps in sequence: an aluminum alloy outer part is subjected to surface mechanical pretreatment, machining tool marks and burrs are removed, and a flat surface is obtained; degreasing is performed to remove greasy dirt on the surface; alkali washing is performed to remove a natural oxidation film on the surface, and an activated aluminum matrix is exposed; acid washing is performed to remove dirty ash on the surface; chemical polishing is performed, and a bright and smoothsurface is obtained; anodic oxidation is performed, and an oxidation film with micropores is formed on the surface; colorizing is performed, and a dyeing agent is deposited to enter the micropores inthe oxidation film; and finally, hole sealing is performed, and the micropores in the oxidation film are sealed. With the adoption of the method for surface treatment, the oxidation film is transparent and bright, the pores in the film are small and dense, the film thickness is uniform, various gorgeous colors can be obtained after coloring and hole sealing, and the aluminum alloy outer part hasexcellent attractive decorative effect and excellent wear resistance and corrosion resistance. The invention further provides an application of the surface treatment method to the 3C product aluminumalloy outer parts such as a smartphone and a tablet computer.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface treatment, and in particular relates to a surface treatment method and application of an aluminum alloy appearance part of a 3C product. Background technique [0002] Aluminum alloy has the advantages of light weight, high strength, good heat dissipation, oxidative coloring, recyclability, and unique metal texture. It is widely used in the appearance of 3C products such as tablets, smart phones, mobile power supplies, digital cameras, and walkmans. Components, such as backplanes, middle frames and borders, etc. However, the surface hardness of aluminum alloy is low, and the surface is easily worn during use. Normally, a layer of natural oxide film is formed on the surface of the aluminum alloy, which has a certain resistance to corrosion, but the natural oxide film is very thin and soft, and is easily damaged and loses its protective effect on the aluminum alloy. [0003] In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/10C25D11/16C25D11/24C25D11/22
CPCC25D11/08C25D11/10C25D11/16C25D11/22C25D11/243
Inventor 王顺成孙小燕赵虎甘春雷刘明阳
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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