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Aluminum shell based on nano molding machining and anode oxidation method thereof

An anodizing and nano-molding technology, applied in the direction of anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve problems such as the decrease of bonding force between aluminum shell and plastic, and achieve the effect of reducing destructive effects

Active Publication Date: 2014-03-19
CHITWING DONGGUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an aluminum housing based on nano-molding and an anodizing method thereof, aiming at solving the problem that the binding force between the NMT aluminum housing and the plastic decreases due to the anodizing process

Method used

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  • Aluminum shell based on nano molding machining and anode oxidation method thereof
  • Aluminum shell based on nano molding machining and anode oxidation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The specific steps and parameters of the anodic oxidation process adopted in embodiment 1 are as follows:

[0045] 1. Sandblasting: sandblasting the aluminum shell with a pressure of 2.2kg;

[0046] 2. Degreasing: Degreasing with 30% sulfuric acid at 70°C for 12 seconds, and then washing with water;

[0047] 3. Alkali etching: Alkali etching with 20% NaOH at a temperature of 55°C for 10s, and then washing with water;

[0048]4. Neutralization: Neutralize with 30% nitric acid at ambient temperature for 10 seconds, then wash with water;

[0049] 5. Chemical research (or foaming): Use sulfuric acid with a concentration of 98% to foam at 100°C for 10 seconds, and then wash with water;

[0050] 6. Neutralization: neutralize at ambient temperature for 10s, then wash with water;

[0051] 7. Anodizing: use 16V voltage, anodize at 20°C, process for 20 minutes, and then wash with water;

[0052] 8. Dyeing: Dye at 55°C for 3.5 minutes, then wash with water;

[0053] 9. Sealin...

Embodiment 2

[0057] The specific steps and parameters of the anodic oxidation process adopted in embodiment 2 are as follows:

[0058] 1. Sandblasting: the pressure used by the sandblasting machine is 2.2kg;

[0059] 2. Degreasing: degrease with 30% sulfuric acid at 70°C for 12s, then wash with water;

[0060] 3. Alkali etching: Treat with 20% NaOH at 55°C for 10s, then wash with water;

[0061] 4. Neutralization: Treat with 30% nitric acid at ambient temperature for 10 seconds, then wash with water;

[0062] 5. Chemical research (or foaming): use 98% sulfuric acid to treat at 90°C for 10 seconds, then wash with water;

[0063] 6. Neutralization: Treat at ambient temperature for 10s, then wash with water;

[0064] 7. Anodizing: Use 16V voltage, treat at 20°C for 20 minutes, then wash with water, and then wash with deionized water;

[0065] 8. Dyeing: Treat at 55°C for 3.5 minutes, wash with water and then wash with deionized water;

[0066] 9. Sealing: Treat at 85°C for 10 minutes, th...

Embodiment 3

[0070] Example 3 uses the anodic oxidation process parameters in Example 1, under the condition that other process parameters do not change, only the alkaline etching and the subsequent neutralization process are omitted, and the NMT aluminum after the above-mentioned anodic oxidation treatment is set The average binding force between the plastic and the surface of the aluminum shell dropped to 104.6N, which was 126-104.6=21.4N lower than that before anodizing treatment, and the binding force lost 17%. Compared with the binding force of Example 1 The loss is reduced by 19%, which shows that the invention can effectively reduce the loss of the bonding force between the plastic and the NMT aluminum shell without the alkali etching and neutralization process, and is suitable for some low-binding force requirements according to the size of the bonding force. Buckle or hook structure.

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Abstract

The invention discloses an aluminum shell based on nano molding machining and an anode oxidation method of the aluminum shell. The method comprises the following steps: performing foaming treatment on the aluminum shell at the temperature of 90+ / -2 DEG C, wherein the aluminum shell is subjected to nano molding technology treatment and in-mold injection molding; performing anodic oxidation on the aluminum shell for 16-24 minutes at voltage of 14-20V, wherein the aluminum shell is subjected to foaming treatment; performing hole sealing on the aluminum shell subjected to anode oxidation for 8-12 minutes at the temperature of 85-100 DEG C. Through innovative improvement on an anode oxidation process of NMT (Nano Molding Technology) aluminum shell, on premise that the appearance quality of the surface of the aluminum shell is ensured, the damage influence on the binding force of the NMT aluminum shell caused by the anode oxidation process is greatly reduced, and practical binding forces of a plastic structure and a metal surface subjected to surface treatment are still maintained, so that beneficial conditions are provided for popularization and application of the NMT aluminum shell in smart phones.

Description

technical field [0001] The invention relates to the technical field of metal casing processing, in particular to an aluminum casing based on nano-molding processing and an anodic oxidation method thereof. Background technique [0002] With the popularization and rapid development of smart phones, the screens of the products are larger and the thickness is thinner. This makes it difficult for the original plastic back cover to meet the strength requirements of the existing products. The back cover of the product is made of plastic structures such as injection-molded buckles, hooks, and even studs. For example, Nano Molding Technology (NMT, Nano Molding Technology) is a new technology that allows plastics to be firmly bonded to metal surfaces. This technology first requires surface corrosion treatment of the metal shell, so that the surface of the metal shell is covered with a layer of nanopores with a diameter of 20-40nm, and then the treated metal shell is subjected to in-mo...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/16C25D11/18
Inventor 闫国栋
Owner CHITWING DONGGUAN TECH