阅读说明：本技术 手机后壳的表面处理方法及手机后壳 (Surface treatment method of mobile phone rear shell and mobile phone rear shell ) 是由 王理栋 王理磊 黄浩 张科 高斯 于 2019-01-15 设计创作，主要内容包括：本发明涉及一种手机后壳的表面处理方法及手机后壳。上述表面处理方法包括以下步骤：提供具有第一表面及与第一表面连接的第二表面的手机后壳；对手机后壳进行阳极处理,以在第一表面和第二表面上形成阳极氧化膜；遮蔽第一表面；对第二表面进行抛光处理,以去除第二表面的阳极氧化膜；对第二表面进行喷砂处理；及对第二表面进行阳极处理。上述手机后壳的处理方法具有工艺简单与成本低的优势,且由上述处理方法得到的手机后壳能够同时具有阳极处理后的色彩面与哑亮面的外观效果。(The invention relates to a surface treatment method of a mobile phone rear shell and the mobile phone rear shell. The surface treatment method comprises the following steps: providing a mobile phone rear shell with a first surface and a second surface connected with the first surface; carrying out anodic treatment on the mobile phone rear shell to form an anodic oxide film on the first surface and the second surface; shielding the first surface; polishing the second surface to remove the anodic oxide film on the second surface; performing sand blasting treatment on the second surface; and anodizing the second surface. The processing method of the mobile phone rear shell has the advantages of simple process and low cost, and the mobile phone rear shell obtained by the processing method can simultaneously have the appearance effects of the color surface and the matte bright surface after the anodic treatment.)

1. A surface treatment method for a mobile phone rear shell is characterized by comprising the following steps:

providing a mobile phone rear shell, wherein the mobile phone rear shell is provided with a first surface and a second surface connected with the first surface;

carrying out anodic treatment on the mobile phone rear shell to form an anodic oxide film on the first surface and the second surface;

masking the first surface;

polishing the second surface to remove the anodic oxide film of the second surface;

performing sand blasting treatment on the second surface; and

and anodizing the second surface.

2. The surface treatment method of the mobile phone rear case according to claim 1, wherein the step of polishing the second surface comprises:

adopting 800-1500 meshes of sand paper, and carrying out rough polishing treatment on the second surface at a rotating speed of 5000-5200 r/min; and

and (3) carrying out middle polishing treatment on the second surface by adopting sand paper of 2000-3000 meshes at the rotating speed of 4000-4300 r/min.

3. The method for treating the surface of the rear case of a cellular phone according to claim 1, wherein in the step of blasting the second surface, the sand mold of the sand used is 205A zircon sand, silicon carbide or alumina, and the blasting pressure is 3.0kg/cm²～3.2kg/cm²。

4. The method for processing the surface of the mobile phone rear shell according to claim 1, wherein in the step of performing sand blasting on the second surface, the transmission frequency of the conveyor belt is 30Hz to 35Hz, and the sand blasting frequency is 30Hz to 40 Hz.

5. The surface treatment method for the mobile phone rear shell according to claim 1, wherein the step of shielding the first surface comprises: and pasting a film on the first surface.

6. The surface treatment method of the mobile phone back case according to claim 1, wherein the step of anodizing the mobile phone back case comprises: and sequentially carrying out anodic oxidation treatment, dyeing treatment and hole sealing treatment on the mobile phone rear shell.

7. The surface treatment method for the mobile phone back case according to claim 1, wherein the step of anodizing the mobile phone back case further comprises: and carrying out degreasing treatment, chemical polishing treatment, alkaline etching treatment and black film stripping treatment on the mobile phone rear shell.

8. The surface treatment method of the mobile phone back case according to claim 7, wherein the degreasing step comprises: and degreasing the surface of the rear shell of the mobile phone by adopting an oil removing agent at the temperature of 50-60 ℃.

9. The surface treatment method of a mobile phone rear case according to claim 7, wherein the step of chemical polishing treatment comprises: and placing the rear shell of the mobile phone in chemical polishing solution for chemical polishing at the temperature of 70-90 ℃.

10. A mobile phone back case obtained by the surface treatment method of the mobile phone back case according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of surface treatment, in particular to a surface treatment method of a mobile phone rear shell and the mobile phone rear shell.

Background

With the rapid change of science and technology, 3C electronic products have penetrated into the public life and become an indispensable part of people's daily life. While pursuing functions, people pay more and more attention to the appearance texture, color and shape of the product. Meanwhile, for product appearance manufacturing enterprises, the combination of professional elements and fashion appearance becomes the standard of product manufacturing, and the enterprises want to improve the industry competitiveness and are eagerly developing a surface treatment process with excellent appearance according to the demands of the public on the appearance. However, in the conventional process, the appearance effect of the mobile phone rear shell is single, and the enterprise usually increases the production cost by developing a new surface treatment process, resulting in the reduction of the production efficiency.

Disclosure of Invention

Accordingly, there is a need for a surface treatment method for a mobile phone back case that can provide a variety of appearance effects to the mobile phone back case, and is efficient and low-cost.

In addition, a mobile phone rear shell is also provided.

A surface treatment method for a mobile phone rear shell comprises the following steps:

providing a mobile phone rear shell, wherein the mobile phone rear shell is provided with a first surface and a second surface connected with the first surface;

carrying out anodic treatment on the mobile phone rear shell to form an anodic oxide film on the first surface and the second surface;

masking the first surface;

polishing the second surface to remove the anodic oxide film of the second surface;

performing sand blasting treatment on the second surface; and

and anodizing the second surface.

In one embodiment, the step of polishing the second surface includes:

adopting 800-1500 meshes of sand paper, and carrying out rough polishing treatment on the second surface at a rotating speed of 5000-5200 r/min; and

and (3) carrying out middle polishing treatment on the second surface by adopting sand paper of 2000-3000 meshes at the rotating speed of 4000-4300 r/min.

In one embodiment, the sand blasting step is performed with 205A zircon sand, carborundum or alumina sand and the blasting pressure is 3.0kg/cm²～3.2kg/cm²。

In one embodiment, in the step of performing sand blasting on the second surface, the transmission frequency of the conveyer belt is 30Hz to 35Hz, and the sand blasting frequency is 30Hz to 40 Hz.

In one embodiment, the step of masking the first surface comprises: and pasting a film on the first surface.

In one embodiment, the step of anodizing the mobile phone back case comprises: and sequentially carrying out anodic oxidation treatment, dyeing treatment and hole sealing treatment on the mobile phone rear shell.

In one embodiment, the step of anodizing the mobile phone back shell further comprises performing degreasing treatment, chemical polishing treatment, alkaline etching treatment and black film stripping treatment on the mobile phone back shell.

In one embodiment, the step of degreasing comprises: and degreasing the surface of the rear shell of the mobile phone by adopting a degreasing agent at the temperature of 50-60 ℃.

In one embodiment, the step of chemically polishing includes: and placing the rear shell of the mobile phone in chemical polishing solution for chemical polishing at the temperature of 70-90 ℃.

A mobile phone back shell obtained by the surface treatment method of the mobile phone back shell.

The surface treatment method of the mobile phone rear shell avoids updating of processing equipment, consumables and the like caused by introduction of a new process, and reduces the production cost of enterprises. In the technical means of making the mobile phone rear shell have different effects of the first surface and the second surface in the traditional technology, the second surface of the mobile phone rear shell is firstly shielded by adopting a special jig, then the first surface is subjected to sand blasting treatment, then the first surface of the mobile phone rear shell is shielded, the jig for shielding the second surface is removed, the jig for shielding the second surface is installed into another jig, the second surface is subjected to wire drawing treatment, and finally the jig is removed, and the whole body is subjected to anodic oxidation treatment. The surface treatment method in the prior art is complex to operate, and the jig needs to be assembled and disassembled for many times, so that the production cost is increased, and the production efficiency is low. The surface treatment method of the mobile phone rear shell only needs to shield the first surface of the mobile phone rear shell after the anodic treatment, and then adopts the steps of respectively carrying out the polishing treatment, the sand blasting treatment and the anodic treatment on the second surface, so that new equipment is not needed to be introduced, the production cost is reduced, a jig is not needed to be disassembled and assembled for many times, and the production efficiency is improved. Meanwhile, the surface of the mobile phone rear shell can have two different appearance effects by the surface treatment method of the mobile phone rear shell.

Drawings

Fig. 1 is a flowchart of a surface treatment method of a mobile phone rear case according to an embodiment.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following description taken in conjunction with the accompanying drawings. The detailed description sets forth the preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, a surface treatment method for a mobile phone rear case according to an embodiment includes the following steps:

step S110: a mobile phone rear shell is provided, and the mobile phone rear shell is provided with a first surface and a second surface connected with the first surface.

Specifically, the mobile phone rear shell is an aluminum alloy mobile phone rear shell. In this embodiment, there are a plurality of second surfaces, and the plurality of second surfaces are all connected to the first surface.

Step S120: and carrying out anode treatment on the mobile phone rear shell to form an anode oxide film on the first surface and the second surface.

Specifically, the step of anodizing the rear shell of the mobile phone comprises the following steps: and sequentially carrying out anodic oxidation treatment, dyeing treatment and hole sealing treatment on the rear shell of the mobile phone. Further, before the step of anodizing the mobile phone rear shell, a step of preprocessing is also included. Specifically, the pretreatment comprises the steps of degreasing treatment, chemical polishing treatment, alkaline etching treatment and black film stripping treatment so as to remove pollutants and impurities on the surface of the mobile phone rear shell and facilitate the subsequent anode treatment of the mobile phone rear shell.

The degreasing treatment is to remove pollutants such as grease and dust on the surface of the rear shell of the mobile phone by using a degreasing agent at a certain temperature, specifically, the temperature is 50-60 ℃, in the embodiment, the degreasing agent is a mixed solution of sodium phosphate, sodium carbonate and sodium pyrophosphate with the concentration of 45 g/L-55 g/L.

Specifically, in the present embodiment, ultrasonic treatment is used for degreasing treatment, and the treatment time is 3 to 5 min. And pollutants such as oil stains on the surface of the mobile phone rear shell can be removed through degreasing, so that preparation is made for next treatment.

The chemical polishing treatment is to immerse the mobile phone back shell in chemical polishing liquid so that the mobile phone back shell is subjected to chemical reaction to obtain a bright and smooth aluminum surface. In this embodiment, the chemical polishing solution is a mixed solution of phosphoric acid, sulfuric acid, polyethylene glycol, and copper sulfate, or a mixed solution of phosphoric acid, sulfuric acid, and nitric acid. It is understood that in other embodiments, the chemical polishing solution can be other reagents. The temperature in the chemical polishing process is 70-90 ℃.

The alkaline etching treatment is mainly to etch off a natural oxidation film on the surface of the mobile phone rear shell by using NaOH strong alkaline solution at normal temperature.

The black stripping treatment is to remove alkali-insoluble metal compounds such as copper, silicon, iron and the like on the surface of the rear shell of the mobile phone after alkali etching and alkali washing products thereof. The reagent used in the process of stripping the black film is dilute acid solution. Specifically, the reagent used in the process of stripping the black film is a nitric acid solution or a hydrochloric acid solution.

In the anodic oxidation treatment, the appearance of the mobile phone rear shell is used as an anode, a sulfuric acid solution and a phosphoric acid solution are used as electrolyte, and the aluminum oxide film is obtained by electrolysis under specific electrolysis conditions. Wherein the mass fraction of the sulfuric acid solution is 55-70%, and the mass fraction of the phosphoric acid solution is 5-10%. In the present embodiment, the current density during anodic oxidation is 1.0A/dm²～1.5A/dm²The voltage is 10V-15V, the temperature is 15-25 ℃, and the electrolysis time is 30-60 min. Through anodic oxidation treatment, a compact and uniform aluminum oxide film is generated on the surface of the mobile phone rear shell.

The dyeing treatment is to fill dye molecules in the organic dye into nanometer gaps on the surface of the mobile phone rear shell, so that the decoration and corrosion resistance of the mobile phone rear shell are improved, and various functional characteristics of the surface of the mobile phone rear shell are improved. Specifically, the mobile phone rear shell is placed in a dyeing agent with the pH value of 5-6 at room temperature and is kept stand for 50-70 s, so that the mobile phone rear shell is dyed. Through selecting different colours of coloring agent for use and dyeing, can make the cell-phone backshell present different colours, satisfy different individual requirements. The coloring agent can be golden coloring agent, blue coloring agent, black coloring agent, etc.

The hole sealing treatment is to fill and seal micropores of the anodic oxide film through hydration reaction, the pollution resistance and the corrosion resistance of the anodic oxide film can be improved through the hole sealing treatment, a hole sealing agent adopted in the hole sealing treatment is a nickel sulfate solution with the concentration of 10 g/L-12 g/L, the temperature of the hole sealing treatment is 85-95 ℃, and the step of washing and drying the rear shell of the mobile phone is further included after the step of the hole sealing treatment, so that ions on the surface of the rear shell of the mobile phone are removed.

Through pretreatment and anodic treatment, a uniform and corrosion-resistant aluminum oxide film can be formed on the surface of the mobile phone rear shell.

Step S130: the first surface of the mobile phone rear shell is shielded.

Specifically, in the present embodiment, the step of masking the first surface includes:

placing the mobile phone rear shell on a grinding machine for fixing and clamping, and shielding and protecting the first surface of the mobile phone rear shell by using a clamp; and

and pasting a film on the first surface of the mobile phone rear shell.

By shielding the first surface, the anodized film on the first surface can be prevented from being damaged.

Step S140: and polishing the second surface of the rear shell of the mobile phone.

Specifically, the step of polishing the second surface of the rear shell of the mobile phone comprises:

adopting 800-1500 meshes of sand paper, and carrying out rough polishing treatment on the second surface at the rotating speed of 5000-5200 r/min; and

and (3) carrying out middle polishing treatment on the second surface by adopting sand paper of 2000-3000 meshes at the rotating speed of 4000-4300 r/min.

Specifically, in the present embodiment, both the rough polishing process and the middle polishing process are performed by using a polishing wheel. It is understood that in other embodiments, other devices may be used for the rough polishing process and the intermediate polishing process. The second surface is subjected to rough polishing treatment for the purpose of removing the anodic oxide film of the second surface. And the surface roughness of the second surface can be refined by performing middle polishing treatment on the second surface, so that no visible particles exist on the surface of the mobile phone rear shell, and the second surface can be subjected to sand blasting treatment subsequently.

Step S150: and carrying out sand blasting treatment on the second surface of the mobile phone rear shell.

Specifically, in the blasting treatment, a sand mold 205A of zircon sand, silicon carbide sand or alumina sand was used, and the blasting pressure was 3.0kg/cm²～3.2kg/cm²So that the sand forms pits with the diameter of 0.6-0.7 mu m on the second surface. The transmission frequency of the conveyer belt in the sand blasting treatment is 30 Hz-35 Hz, and the sand blasting frequency is 30 Hz-40 Hz. Through the sand blasting treatment, the second surface of the mobile phone rear shell generates a matte and bright effect.

Step S160: and anodizing the second surface.

Specifically, before step S160 and after step S150, the step of attaching a film to the first surface of the mobile phone rear case in step S130 is further included to shield and protect the first surface.

The step of anodizing the second surface of the rear shell of the mobile phone comprises the following steps: and sequentially carrying out anodic oxidation treatment, dyeing treatment and hole sealing treatment on the second surface. Further, the step of anodizing the second surface is the same as the step of anodizing the mobile phone rear case in step S120, and is not described herein again.

By carrying out anodic treatment on the second surface, an oxide film can be formed on the second surface after sand blasting treatment, the second surface is protected from being polluted, natural oxidation is not generated on the second surface, and pollution resistance and corrosion resistance of the second surface are improved. Further, the coloring agent used in the process of dyeing the second surface may be the same as or different from the coloring agent used in the first surface, so that the color of the mobile phone rear shell is richer.

The surface treatment method of the mobile phone rear shell at least has the following advantages:

(1) the surface treatment method has simple process, does not need to introduce new equipment, reduces the production cost of enterprises, and has the production advantage of low cost.

(2) The surface treatment method of the mobile phone rear shell can enable the first surface and the second surface of the mobile phone rear shell to have different effects, only the first surface of the mobile phone rear shell needs to be shielded and protected, the second surface does not need to be shielded, and the reduction of production efficiency caused by multiple shielding is avoided.

(3) By the surface treatment method of the mobile phone rear shell, the mobile phone rear shell with the anodic oxide film on the first surface and the matte effect on the second surface can be obtained.

The mobile phone back shell of an embodiment is obtained by the surface treatment method of the mobile phone back shell. The first surface of the mobile phone rear shell is provided with the anodic oxide film, the second surface of the mobile phone rear shell is provided with the matte effect, so that the mobile phone rear shell has two different appearance effects, and the requirement of people on fashionable appearance of the mobile phone rear shell is met.

The following are specific examples: