CN110983402B

CN110983402B - Surface processing method of shell, shell and electronic equipment

Info

Publication number: CN110983402B
Application number: CN201911266427.5A
Authority: CN
Inventors: 刘思颖
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2021-03-02
Anticipated expiration: 2039-12-11
Also published as: CN110983402A

Abstract

The embodiment of the invention discloses a shell surface processing method, a shell and electronic equipment. The method comprises the following steps: carrying out surface anodic oxidation on the shell sectional material by adopting acid electrolyte, and forming a porous oxide layer at least in a target area of the shell sectional material; carrying out gradient dyeing on the target area of the shell sectional material by utilizing a printing and dyeing process so as to form a gradient color effect in the target area; and carrying out hole sealing treatment on the shell section bar with the gradient color effect to obtain the shell. By adopting the method provided by the embodiment of the invention, the gradient effect of the narrow area of the shell can be realized.

Description

Surface processing method of shell, shell and electronic equipment

Technical Field

The embodiment of the invention relates to the technical field of electronic equipment, in particular to a shell surface processing method, a shell and electronic equipment.

Background

In recent years, metal materials represented by aluminum alloys have been widely used for 3C products, for example, housings for 3C products, because of their excellent machining characteristics. The "3C-based product" is a general term for computers (computers), communications (communications), and Consumer Electronics (Consumer Electronics).

Designers have proposed a gradient color appearance modification of the housing to make class 3C products an attractive appearance. However, when the target region of the narrow range of the housing is immersed in the dyeing liquid to perform the gradation dyeing, there is a problem that the gradation is blurred due to unstable factors such as fluctuation and waviness of the dyeing liquid. Therefore, it is difficult for the case to achieve a narrow-area gradation effect.

Based on this, the present application is specifically proposed.

Disclosure of Invention

The embodiment of the invention provides a surface processing method of a shell, the shell and electronic equipment, and aims to solve the problem that the shell is difficult to realize a narrow-area gradient effect.

In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a surface processing method for a housing, including:

carrying out surface anodic oxidation on the shell sectional material by adopting acid electrolyte, and forming a porous oxide layer at least in a target area of the shell sectional material;

carrying out gradient dyeing on a target area of the shell sectional material by utilizing a printing and dyeing process so as to form a gradient color effect in the target area;

and (4) carrying out hole sealing treatment on the shell section bar with the gradient color effect to obtain the shell.

In a second aspect, embodiments of the present invention further provide a housing, which includes a gradient region; wherein the gradient coloured region of the shell is formed by a process according to the first aspect of the present application.

In a third aspect, embodiments of the present invention further provide an electronic device, which includes the housing according to the second aspect of the present application.

In the embodiment of the invention, a porous oxide layer is formed in a target area of the shell profile by a surface anodization process; then, carrying out gradient dyeing on a target area of the shell sectional material by using a printing and dyeing process, so that the pigment is adsorbed on the porous oxide layer in a concentration gradient manner in a preset direction to form a gradient color effect; and then, carrying out hole sealing treatment on the shell sectional material to ensure that the pigment is stably adsorbed on the porous oxide layer. Therefore, the embodiment of the invention can realize clear and stable color gradient effect and higher gradient consistency in any area of the shell. Any of the foregoing regions includes a narrow region.

Drawings

The invention will be better understood from the following description of specific embodiments thereof, taken in conjunction with the accompanying drawings. Wherein like or similar reference numerals refer to like or similar features.

Fig. 1 is a flowchart of a surface processing method of a housing according to an embodiment of the present invention.

Fig. 2 is a schematic view of a target area of a shell profile covered by a covering piece according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

An embodiment of the first aspect of the invention provides a surface processing method of a shell. Referring to fig. 1, a surface processing method of a housing according to an embodiment of the present invention includes the following steps:

and S100, carrying out surface anodic oxidation on the shell sectional material by adopting acid electrolyte, and forming a porous oxide layer at least in a target area of the shell sectional material.

And S200, performing gradient dyeing on the target area of the shell sectional material by using a printing and dyeing process to form a gradient color effect in the target area.

And S300, carrying out hole sealing treatment on the shell section bar with the gradient color effect to obtain the shell.

It will be appreciated that any metal capable of forming a porous oxide layer on its surface by anodic oxidation may be used for the housing. The aforementioned metals include pure metals or alloys, which may be, but are not limited to, aluminum alloys, and the like. The housing may be of any configuration, such as a plate-like configuration, a frame-like configuration, or a combination thereof. As a specific example, the housing includes a housing bottom and a side frame disposed along a periphery of the housing bottom, and the housing and the side frame enclose to form an accommodating space.

In the method of the embodiment of the present invention, a porous oxide layer is formed at least in a target region of the case section through a surface anodization process at step S100. The porous oxide layer obtained by surface anodic oxidation has a proper porous structure, and is beneficial to realizing gradual change dyeing subsequently.

Then, in step S200, the target area of the shell profile is gradually dyed by using a printing and dyeing process, so that the pigment is adsorbed on the porous oxide layer in a concentration gradient in a predetermined direction (e.g., a width direction of the porous oxide layer). Therefore, the gradual change color effect is formed in the target area of the shell sectional material, and the problem that the gradual change effect of a narrow area is difficult to realize due to more unstable factors of the infiltration dyeing process is solved. Therefore, in step S200, the target area to be subjected to the gradation dyeing may be any width, and the width may be on the order of millimeters or less, such as 5mm or less, 3mm or less, 2mm or less, 1mm or less, and the like. For example, the target region for performing gradation dyeing may be a narrow width region of 0.5mm to 1.5 mm. Moreover, the gradient color pixels in the target area are clear and have good gradient color consistency.

Then, in step S300, the case section bar with the gradient color effect is subjected to hole sealing treatment, so that the pigment is stably adsorbed on the porous oxide layer. The hole sealing treatment of step S300 can improve the coloring stability of the porous oxide layer and improve the corrosion resistance of the porous oxide layer at the same time.

Therefore, the surface processing method of the shell provided by the embodiment of the invention can realize clear and stable gradient color effect and higher gradient consistency in any area of the shell. Any of the foregoing regions includes a narrow region.

The surface anodizing process of step S100 may be performed in an apparatus known in the art, such as an anodizing bath. The type of the cathode plate is not particularly required, and can be selected according to the process principle and the actual requirement of anodic oxidation.

In some embodiments, in the surface anodization process of step S100, the anodization voltage is 10V or more, the temperature is 10 ℃ or more, and the time is 40min or more. This facilitates the rapid growth of the porous oxide layer and allows it to achieve higher depth, porosity and larger pore size. Therefore, the pigment can conveniently permeate into the porous structure of the oxide layer, and quick coloring is realized. Further, the anodic oxidation voltage is 20V or less, the temperature is 20 ℃ or less, and the time is 100min or less. This enables the oxide layer to have a complete porous structure with uniformly distributed pores, while preventing the porous oxide layer from the risk of fracture and collapse. Therefore, the gradient dyeing consistency of the porous oxide layer is better, and the surface is smooth.

In some embodiments, in step S100, the voltage of the anodization is 10V to 20V, the temperature of the anodization is 10 ℃ to 20 ℃, and the time of the anodization is 40min to 100 min. The voltage, temperature and time of the anodic oxidation are controlled in a proper range, so that the porous oxide layer has proper depth (thickness), porosity and pore diameter, and the surface consistency is good. Therefore, the effect of the gradation color of the case can be improved.

In some preferred embodiments, in step S100, the voltage of the anodization is 12V to 13V, the temperature of the anodization is 15 ℃ to 18 ℃, and the time of the anodization is 50min to 80 min. The voltage, temperature and time of anodic oxidation are respectively controlled within the range, so that the depth, pore distribution, porosity and pore diameter of the porous oxide layer can be further improved, and the gradient color effect can be further improved.

In some embodiments, in step S100, the acid electrolyte may be selected from a sulfuric acid solution or a mixed solution of sulfuric acid and oxalic acid. The acidic electrolyte is favorable for enabling the porous oxide layer to have a better porous structure.

In some embodiments, the acid electrolyte may employ a sulfuric acid solution in step S100. The concentration of the sulfuric acid solution is preferably 150g/L to 250g/L, more preferably 180g/L to 220g/L, such as 200 g/L. The concentration of the sulfuric acid solution is proper, so that the porous oxide layer has a better porous structure.

In some embodiments, the acid electrolyte may use a mixed solution of sulfuric acid and oxalic acid in step S100. In the mixed solution of the sulfuric acid and the oxalic acid, the concentration of the oxalic acid can be 20 g/L-80 g/L, such as 30 g/L-60 g/L. Further, in the mixed solution of sulfuric acid and oxalic acid, the mass ratio of sulfuric acid to oxalic acid may be 1:1 to 5:1, such as 2:1 to 3: 1. The acidic electrolyte can enable the porous oxide layer to have a better porous structure.

In some embodiments, in step S100, the porosity of the porous oxide layer is preferably 10% to 20%. For example, the porosity of the porous oxide layer may be 10% or more, 11% or more, 12% or more, or 13% or more. The method is favorable for the pigment to quickly penetrate into the porous oxide layer, and the dyed color is more transparent. The porosity of the porous oxide layer may be 20% or less, 19% or less, 18% or less, or 17% or less. The gradient color effect with clear pixels and good consistency is obtained, and meanwhile, the area where the porous oxide layer is located can be ensured to have higher strength, namely, the overall strength of the shell is higher.

In some embodiments, in step S100, the pore diameter of the pores in the porous oxide layer is preferably 10nm to 100 nm. For example, the pore diameter of the pores in the porous oxide layer may be 10nm or more, 20nm or more, 30nm or more, 40nm or more, or 50nm or more. The method is favorable for the pigment to quickly penetrate into the porous oxide layer, and the dyed color is more transparent. The pore diameter of pores in the porous oxide layer may be 100nm or less, 90nm or less, 80nm or less, 70nm or less, or 60nm or less. The gradient color effect with clear pixels and good consistency is obtained, and the area where the porous oxide layer is located is ensured to have higher strength, so that the shell has higher overall strength.

In some embodiments, the thickness (depth) of the porous oxide layer may be 8 μm to 20 μm, such as 9 μm to 16 μm, and further such as 10 μm to 15 μm, at step S100. The thickness of the porous oxide layer is proper, which is beneficial to improving the pixel definition of the gradient color and the gradient consistency.

In some preferred embodiments, in step S100, it is also simultaneously satisfied that the porosity of the porous oxide layer is 10% to 20%, the pore diameter of pores in the porous oxide layer is 10nm to 100nm, and the thickness of the porous oxide layer is 8 μm to 20 μm. Therefore, the shell has higher overall strength and better gradient effect.

At step S200, the pigment for printing may be selected according to the color requirement of the gradient color, and is not particularly limited herein. As an example, CMYK (also referred to as print color mode) may be employed when performing a gradation coloring using a print coloring process. CMYK is a four color mixture overlay, namely c (cyan): cyan, m (magenta): magenta, y (yellow): yellow, k (black): black in color. The mixture ratio of four colors can be determined according to the actual color requirement, for example, pure black is: 0% C, 0% M, 0% Y, 100% K; blue is: 100% C, 100% M, 0% Y, 0% K, etc.

In step S200, the gradient color can be printed on the target area of the housing profile in various ways to form a gradient color effect on the target area.

For example, in some embodiments, the print-dyeing process may be a thermal sublimation printing process. The gradient color obtained by the thermal sublimation printing process has higher resolution and is not easy to fade. Then, step S200 may include:

s210, shielding a target area of the shell sectional material by using a shielding piece, wherein a space is formed between the shielding piece and the shell sectional material to form a pigment channel, one end of the pigment channel corresponding to the gradient dark color boundary is a seal, and the other end of the pigment channel opposite to the one end (namely, one end of the pigment channel corresponding to the gradient light color boundary) is an opening.

In step S210, the shielding member may be any shielding structure having heat resistance and stability to the pigment, such as a metal plate, a plastic plate, or the like.

And S220, spraying the pigment to the target area from the opening of the pigment channel by adopting a thermal sublimation printing process so as to gradually dye the target area.

In step S220, the pigment is sublimated through the thermal sublimation printing process, and the pigment in the gas phase enters the pigment passage from the open end of the pigment passage. In the process, the pigment penetrates into the porous oxide layer to realize gradual dyeing.

In some embodiments, referring to fig. 2, preferably, the distance between the shielding element 20 and the housing profile 10 increases gradually from the sealed end 21 to the open end 22, i.e. the paint channel has an increasing height gradient from the sealed end 21 to the open end 22. Thereby, the pressure of the gas-phase pigment in the pigment passage in the direction from the open end 22 to the sealed end 21 is gradually increased. Thus, the amount of the pigment penetrating into the porous oxide layer gradually increases from the open end 22 to the closed end 21, thereby achieving a better gradation effect.

In some embodiments, the angle α between the shield 20 and the target area 11 can be 15 to 90 degrees, for example 20 to 70 degrees, and further for example 30 to 50 degrees. The pigment channel has proper height gradient, which is favorable for obtaining better gradient effect.

For example, the target area 11 may have a dimension in the direction of the gradual fade of 0.5mm to 1.5mm, such as 1mm, and the height gradient of the pigment channel may be in the range of 0mm to 1 mm. That is, the height of the lowest portion of the paint passage (i.e., the closed end 21) may be 0mm, 0.01mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc.; and the height of the highest point (i.e., open end) of the pigment channel may be 1mm, 0.9mm, 0.8mm, 0.7mm, 0.6mm, etc.

In step S220, the temperature of the thermal sublimation printing may be 100 ℃ to 250 ℃, such as 150 ℃ to 220 ℃. The temperature of thermal sublimation printing is proper, can guarantee the abundant gasification of pigment, improves the color resolution ratio of gradual change look.

The thermal sublimation printing is preferably performed in a vacuum environment. The vacuum pressure may be, for example, 1000Pa or less, such as 10Pa to 1000 Pa.

The step S220 may be performed using a sublimation printer.

In some embodiments, a porous oxide layer may be formed on the target area and the non-target area of the case profile through a surface anodization process at step S100. In these embodiments, the shield can also shield the non-target areas from the pigment during the gradient coloring process using the dye-sublimation printing process. This prevents the problem of the pigment staining the non-target area and deteriorating the gradation effect.

As shown in fig. 2, the non-target area 12 and the target area 11 are adjacently arranged, and the part of the shielding member 20 corresponding to the non-target area 12 can be attached to the non-target area 12, so as to achieve the effect of shielding the non-target area 12; with the portion of the shield 20 corresponding to the target area 11 being spaced from the target area 11 to provide a colour channel, and with the shield 20 forming an opening with the edge of the target area 11 remote from the non-target area 12 for the colour to enter.

In other embodiments, the print-dyeing process may be a thermal transfer printing process. The adoption of the thermal transfer printing process can also ensure that the gradient color has higher color resolution ratio and is not easy to fade. Then, step S200 may include:

s210', printing a gradient color pigment film layer on the substrate to obtain a transfer printing substrate.

In step S210', any material that is heat resistant and stable to pigment, such as plastic film, metal film, etc., may be used as the substrate. The thickness of the gradient film layer can be determined according to the thickness of the porous oxide layer.

S220', covering the transfer printing substrate on the target area of the shell sectional material, and enabling the gradient color film layer to face the shell sectional material.

In step S220', the color-gradient film layer is made to face the housing profile, so that the pigment in the color-gradient film layer can penetrate into the porous oxide layer.

And S230', heating the shell sectional material covered with the transfer printing substrate in a vacuum environment so as to transfer the pigment of the gradient color film layer to a target area for gradient dyeing.

In step S230', under a heating condition, the pigment of the gradient color film layer permeates into the porous oxide layer, so that the gradient color pattern is transferred to the shell profile, and a gradient color effect is obtained.

In step S230', the vacuum pressure of the vacuum environment may be 0-1000 Pa. The gradual dyeing temperature may be from 100 ℃ to 250 ℃, such as from 180 ℃ to 200 ℃. The gradual change dyeing time can be 3min to 30min, such as 1min to 10 min. The pigment of the gradient color film layer can fully permeate into the porous oxide layer, so that the shell sectional material can obtain a better gradient color pattern effect.

And after the pigment of the gradient color film layer is transferred into the porous oxide layer, removing the substrate.

In some embodiments, in step S300, the shell profile formed with the gradient color effect may be immersed in a sealing liquid for heat treatment to seal the holes. After hole sealing, the color of the gradient color area is clearer and more stable, the surface is smoother, and the corrosion resistance is better.

In step S300, the sealing liquid may be one or more selected from water, a nickel oxalate solution, a nickel sulfate solution, and a nickel acetate solution, and preferably a nickel acetate solution. The concentration of nickel ions in the nickel acetate solution can be 1.4 g/L-1.8 g/L. The nickel acetate solution may also contain additives, such as one or more of dispersants, complexing agents, and surfactants. The content of the additive in the nickel acetate solution can be 0.5 g/L-1.5 g/L. Preferably, the pH value of the nickel acetate solution is 5.5-6.5.

In step S300, the temperature of the heat treatment may be controlled to be 80-100 deg.C, such as 90-100 deg.C. The time of the heating treatment can be controlled within 30 min-80 min, such as 35 min-40 min.

And a proper hole sealing liquid is selected and heated at a proper temperature for a proper time, so that a better hole sealing effect can be obtained.

In some embodiments, if a larger area (e.g., the entire surface including the target area) including the target area and the non-target area on the surface of the shell-shaped material is anodized in step S100, a porous oxide layer having an area larger than that of the target area is formed. Then, before step S200, the method may further include:

s400, immersing the shell sectional material with the porous oxide layer into dyeing liquor, and carrying out immersion dyeing on the shell sectional material to obtain the target ground color.

The color of the shell profile can be more diversified and personalized through the infiltration dyeing in the step S400.

It is understood that, in step S400, the non-target area may be dyed by immersing a portion of the non-target area in the dyeing solution; alternatively, the entire shell section may be immersed in the dyeing solution to dye the entire porous oxide layer region.

In step S400, there is no special requirement for the dye solution, and the dye solution can be selected according to the requirement of the target ground color. For example, the target background color is black, and the staining solution may contain the japanese ovolite dye 420: 5g/L, 411: 8g/L, 102: 3 g/L.

In step S400, optionally, the temperature of the soaking and dyeing may be 20 ℃ to 60 ℃, such as 30 ℃ to 50 ℃; the soaking and dyeing time can be 10min to 30min, such as 15min to 20 min.

Step S400 may be performed using equipment known in the art, such as a staining bath.

In some embodiments, before step S100, the method may further include:

and S510, forming the metal raw material to obtain a shell profile rough product with a required structure.

In step S510, the metal raw material may be a metal ingot, a metal plate, a metal powder, or the like. The metal stock may be shaped by methods known in the art to provide a shell profile preform having the desired configuration. For example, CNC milling is performed on a metal plate to obtain a metal frame.

S520, polishing the rough shell profile product to obtain the shell profile.

In step S520, the brightness of the porous oxide layer obtained after the anodic oxidation treatment of the shell profile can be improved by forming the shell profile into a mirror surface effect through the polishing treatment, so that the metallic luster of the gradient color region and other anodic oxidation dyeing regions can be improved.

In some embodiments, the shell profile obtained after polishing can be subjected to a cleaning process to remove surface residues.

Embodiments of a second aspect of the invention provide a housing comprising a gradient region. The graduated coloured regions of the shell are formed by any one of the processes of the first aspect of the invention. Therefore, the gradual color change area of the shell has clear and stable gradual color change effect and higher gradual color change consistency and corrosion resistance. The gradation region may have any size in the gradation direction, and particularly, the size is on the order of millimeters or less, for example, 5mm or less, 3mm or less, 2mm or less, 1mm or less, or the like.

The housing may be of any shape and configuration. In some embodiments, the housing is a front case, a back case, or a side bezel for an electronic device, among others. The electronic device may be a mobile phone, a notebook computer, a tablet computer, a learning machine, an electronic reader, a wearable electronic device (such as a smart watch), and the like.

Embodiments of the third aspect of the invention provide an electronic device comprising a housing of the second aspect of the invention. The type of the electronic device is not particularly limited, and the electronic device can be a mobile phone, a notebook computer, a tablet computer, a learning machine, an electronic reader, a wearable electronic device (such as a smart watch) and the like.

For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.

In the description herein, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive, and "a plurality" of "one or more" means two or more.

Examples

The present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and the equipment used in the examples is commercially available.

Example 1

1) Aluminum alloy blanking and polishing

And (4) grinding and polishing the aluminum alloy after the appearance of the metal mobile phone shell is milled by CNC for later use. The Z-direction (namely the thickness direction of the mobile phone) size of the metal mobile phone shell section is 3-4 mm.

2) Surface anodization

Cleaning the shell section bar obtained in the step 1), and putting the shell section bar into an anodic oxidation tank, wherein the anodic oxidation tank contains H with the concentration of 200g/L₂SO₄And (3) solution. Controlling the anodic oxidation voltage to be 13V, the anodic oxidation time to be 50min, the anodic oxidation temperature to be 15 ℃, and forming a porous oxide layer on the peripheral surface of the shell sectional material. The thickness of the obtained porous oxide layer is about 10 mu m, the porosity is about 15 percent, and the pore size distribution of pores is 40 nm-80 nm.

3) Soaking and dyeing

Transferring the shell sectional material with the anodized surface into a dyeing tank, and dyeing in a dyeing solution. The color toner depends on the desired color of the product. In this example, the staining color is black, and the staining solution contains a dye 420: 5g/L, 411: 8g/L, and 102: 3 g/L. The dyeing temperature is 35 ℃ and the dyeing time is 20 min. The whole peripheral surface of the soaked and dyed shell sectional material is dyed into black.

4) Gradual change dyeing

The soaked and dyed shell sectional material is divided into a first half part and a second half part in the Z direction, and the Z-direction width of the second half part is 1 mm. Shielding the peripheral surface of the shell profile by using a shielding piece, wherein the shielding piece is attached to the surface of the first half part to shield the first half part; the shielding piece is bent from the junction of the first half part and the second half part to the direction far away from the shell profile, so that an included angle of 45 degrees is formed between the shielding piece and the second half part. An opening for pigment to enter is formed between the shielding piece and the edge of the second half part far away from the first half part.

The shell profile was then placed in a vacuum printing apparatus (marteng MUTOH VJ-1624W) and was dyed in a gradient by a dye sublimation printing process. The print color depends on the desired color of the product. In this example, blue. The print dye process employs CMYK (also known as print color mode): 100% C, 100% M, 0% Y, 0% K. The thermal sublimation printing is performed under a vacuum atmosphere at a vacuum pressure of 1000Pa or less. The temperature of printing was 200 ℃. The printing head runs a circle around the circumference of the shell section bar corresponding to the opening to finish the gradual change dyeing. I.e. a graduated dyeing effect is obtained in the second half of the shell profile.

5) Hole sealing

Immersing the product in nickel acetate solution, heating at 95 ℃ for 60min, and sealing the holes. The nickel acetate solution takes water as a solvent, and the concentration of nickel acetate contained in the nickel acetate solution is 5 g/L. The pH of the nickel acetate solution was 5.5.

Finally, the mobile phone shell with the gradient color effect is obtained. In the mobile phone shell, the width of the gradient color area in the Z direction is 1mm, so that the gradient color effect of the narrow area is realized, and the gradient color pixels are clear and have good gradient color consistency. The integrated appearance design of the whole mobile phone can be realized by the technical scheme, and the whole mobile phone is thinner and more fashionable visually.

While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and it will be apparent to those of ordinary skill in the art in light of the teachings of the present invention that many more modifications can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A surface processing method of a housing, characterized by comprising:

carrying out gradient dyeing on the target area of the shell profile by utilizing a printing and dyeing process so as to form a gradient color effect in the target area, wherein the gradient dyeing process comprises the following steps:

shielding the target area of the shell profile by using a shielding piece, wherein a distance is reserved between the shielding piece and the target area to form a pigment channel, one end of the pigment channel corresponding to the gradient color dark boundary is a seal, the other end of the pigment channel opposite to the one end is an opening, and the pigment channel is in an increasing height gradient from the one end to the other end;

spraying pigment to the target area from the opening by adopting a thermal sublimation printing process so as to gradually dye the target area;

and carrying out hole sealing treatment on the shell section bar with the gradient color effect to obtain the shell.

2. The method of claim 1, wherein the step of spraying the pigment from the opening to the target area using a sublimation printing process to gradually dye the target area comprises a sublimation printing temperature of 100 ℃ to 250 ℃.

3. The method of claim 1, wherein the angle between the shield and the target area is 15-70 degrees.

4. The method of claim 1, wherein in the step of surface anodizing the case section using the acidic electrolyte to form the porous oxide layer at least in the target region of the case section, the region where the porous oxide layer is formed includes the target region and a non-target region;

the shield also shields the non-target area from contact by paint.

5. The method according to claim 1, wherein the acidic electrolyte is selected from a sulfuric acid solution with a concentration of 150 g/L-250 g/L, or a mixed solution of sulfuric acid and oxalic acid with an oxalic acid concentration of 20 g/L-80 g/L and a mass ratio of sulfuric acid to oxalic acid of 1: 1-5: 1; the voltage of the anodic oxidation is 10V-20V, the temperature of the anodic oxidation is 10 ℃ to 20 ℃, and the time of the anodic oxidation is 40min to 100 min.

6. The method of any one of claims 1-5, wherein the porous oxide layer has a porosity of 10% to 20%; the pore diameter of pores in the porous oxide layer is 10 nm-100 nm; the thickness of the porous oxide layer is 8-20 μm.

7. The method according to any one of claims 1-5, further comprising, prior to the step of gradient dyeing the target area of the housing profile using a print-and-dye process to create a gradient color effect in the target area:

and immersing the shell section bar with the porous oxide layer into dyeing liquid, and carrying out immersion dyeing on the shell section bar so as to obtain the target ground color.

8. A housing, characterized in that the housing comprises a gradient color region;

wherein the tapered region of the housing is formed by processing according to the method of any one of claims 1 to 7.

9. An electronic device characterized by comprising the housing of claim 8.