CN105163540A - Surface treatment method for die-casting aluminum alloy, die-casting aluminum alloy, and mobile terminal housing - Google Patents
Surface treatment method for die-casting aluminum alloy, die-casting aluminum alloy, and mobile terminal housing Download PDFInfo
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- CN105163540A CN105163540A CN201510351690.XA CN201510351690A CN105163540A CN 105163540 A CN105163540 A CN 105163540A CN 201510351690 A CN201510351690 A CN 201510351690A CN 105163540 A CN105163540 A CN 105163540A
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Abstract
The present invention discloses a surface treatment method for a die-casting aluminum alloy, a die-casting aluminum alloy, and a mobile terminal housing. The surface treatment method comprises the following steps: 1) performing ultrasonic cleaning for the die-casting aluminum alloy obtained by die-casting molding and then removing surface impurity of the die-casting aluminum alloy; 2) performing vacuum plating, wherein the pressure in a vacuum chamber is kept at the level higher than 6.5*10<-3>Pa, argon gas with the purity higher than 99.99% is fed in, and the die-casting aluminum alloy treated by the step 1) is plated with a titanium target material with the purity higher than 99.99%, so that a layer of titanium film layer with the thickness of 1-10[mu]m is formed on the surface of the die-casting aluminum alloy; 3) performing anodic oxidation treatment for the die-casting aluminum alloy treated by the step 2); and 4) performing hole sealing processing for a titanium oxide layer of the die-casting aluminum alloy treated by the step 3). Through adoption of the surface treatment method of the present invention, the treated die-casting aluminum alloy has metallic luster and a good appearance effect, at the same time, the surface treatment method has simple treatment process and low cost, and can reduce cost of a mobile terminal when being applied to the mobile terminal.
Description
[technical field]
The present invention relates to the processing process of pack alloy, particularly relate to a kind of surface treatment method and pack alloy, handset shell of pack alloy.
[background technology]
Aluminium alloy, due to advantages such as density are little, heat conductivility energy is high, plasticity is good, is used for making notebook casing, smart mobile phone casing by many product men.But due to its Nature comparison active, easily form one deck amorphous state oxide-film in atmosphere, make its surface lose metallic luster and become ugly, therefore also limit the application of aluminium alloy to a certain extent.For meeting the demand of intelligent mobile terminal appearance looks elegant fashion, usual employing 6 is and 7 aluminium alloys being are the shell that raw material are processed into intelligent mobile terminal.Employing 6 is and 7 aluminium alloys being add man-hour, first punching press, is then processed to form housing profile by the CNC of tens procedures, finally by specific anodized technique, obtains the Al-alloy casing of certain appearance requirement.In this existing scheme, although the aluminum alloy casing obtained has metallic luster and appearance is better, course of processing complex procedures, processing cost is higher, and raw material 6 are and the 7 aluminium alloy prices being are also more expensive.
[summary of the invention]
Technical problem to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, a kind of surface treatment method and pack alloy, mobile terminal shell of pack alloy are proposed, the pack alloy after processing is made to have metallic luster and appearance is better, process treatment process simple, cost is lower simultaneously.
Technical problem of the present invention is solved by following technical scheme:
A surface treatment method for pack alloy, comprises the following steps: after 1) pack alloy obtained by die cast being carried out Ultrasonic Cleaning, removes surface impurity; 2) use vacuum coating mode, the pressure in vacuum chamber remains on 6.5 × 10
-3more than Pa, passes into the argon gas of purity more than 99.99%, by the titanium target plated film of purity more than 99.99% to step 1) on pack alloy after process, make described pack alloy surface form a layer thickness at the titanium film layer of 1 ~ 10 μm; 3) to step 2) process after pack alloy carry out anodized make described titanium film layer segment be oxidized formed titanium oxide layer, oxidation solution working concentration is sulfuric acid solution or the phosphoric acid solution of 100 ~ 200g/L, and after controlling to make anodized, the thickness of described titanium oxide layer and the ratio of the thickness of remaining titanium film layer are (1 ~ 3): 1; 4) to step 3) titanium oxide layer of pack alloy after process carries out sealing pores.
The pack alloy that the surface treatment method process of a kind of basis pack alloy as above obtains.
A kind of mobile terminal shell, described housing is pack alloy as above.
A kind of mobile terminal, the housing of described mobile terminal is mobile terminal shell as above.
The beneficial effect that the present invention is compared with the prior art is:
The surface treatment method of pack alloy of the present invention, carries out surface treatment to pack alloy, makes partial-titanium rete be oxidized to titanium oxide layer through plating titanium film in vacuum layer, anodized.Owing to being that the titanium film layer on pack alloy carries out anodized, even if so the silicon containing more ratio in die-cast aluminum alloy material, containing Si, Mg, Fe, but all isolated by titanium film layer, anodised outward appearance treatment effect can not be affected, thus the pack alloy obtained can have the metal-like that titanium film layer reflects, and the titanium oxide layer effect that anodic oxidation obtains is better.And owing to being to pack alloy process, pack alloy by die cast, compared to 6 is and 7 aluminium alloys being need by the CNC machine-shaping of punching press+tens road, pack alloy handling ease of the present invention many, treatment process is also simple and easy to control, and cost is also lower.
[accompanying drawing explanation]
Fig. 1 is the flow chart of the surface treatment method of the pack alloy of the specific embodiment of the invention.
[embodiment]
Contrast accompanying drawing below in conjunction with embodiment the present invention is described in further details.
The present invention carries out surface treatment to pack alloy.Due to the pack alloy that pack alloy is often ADC3-ADC12 model, usual Si, Mg, Fe content is all very high, as direct anodic oxidation coating film treatment, the interval compounds such as AL-Mg-Si-Fe can be formed, and the higher Si of content ratio also can form siliceous point in anode oxidation process, above-mentioned all meetings make the oxide-film of formation turn black, turn blue, the defect such as be creamy white, and affect appearance, therefore pack alloy is difficult to carry out incrustation by simple anodic oxidation.In the process improved, some schemes attempt using anodic oxidation after falling silicon process, some schemes are then attempted by specific anodized operation, and the scheme also had then to be matched the good surface effect of incompatible acquisition by the anodized mode improving formula in aluminium alloy and improvement.And in the solution of the present invention, by in conjunction with plating titanium film in vacuum and anodic oxidation two kinds of techniques, solve the problem of carrying out decorative appearance on die casting aluminium handset shell surface well, die-cast aluminium shell surface energy can be made to keep stronger metal-like and outward appearance more attractive in appearance by the method.
As shown in Figure 1, be the flow chart of the surface treatment method of pack alloy in this embodiment, surface treatment method comprises the following steps:
1) clean: after the pack alloy obtained by die cast is carried out Ultrasonic Cleaning, remove surface impurity.
In this step, die casting aluminium raw material is obtained the pack alloy of die cast by conventional die casting process.After die cast can in conjunction with the shape of die-cut, polishing processing pack alloy, improve its outward appearance.Also the combination that injection mold injection moulding bonding plastic piece forms pack alloy and plastic parts can be put into, follow-up, plated film, anodized are carried out to the pack alloy part on combination.Whether carry out the process such as die-cut, polishing, injection moulding to adjust according to the difference of application demand, be not restricted.
During Ultrasonic Cleaning, put into acetone or absolute ethyl alcohol carries out Ultrasonic Cleaning 10 ~ 30 minutes, to remove the impurity (comprising surface and oil contaminant) on pack alloy surface.
2) vacuum coating: use vacuum coating mode, the pressure in vacuum chamber remains on 6.5 × 10
-3more than Pa, passes into the argon gas of purity more than 99.99%, by the titanium target plated film of purity more than 99.99% to step 1) on pack alloy after process, make described pack alloy surface form a layer thickness at the titanium film layer of 1 ~ 10 μm.
Particularly, the handset shell after strengthening is positioned in the vacuum chamber of coating machine, then by vacuum pump, the air of vacuum chamber is taken away, make the pressure of vacuum chamber remain on 6.5 × 10
-3more than Pa, passes into the argon gas of purity more than 99.99%, adopts the resistance of least cost to steam mode by titanium target plated film, namely needs the titanium target of the purity more than 99.99% for plated film to be placed on the evaporation boat inside vacuum chamber prior to aluminium alloy.Apply certain evaporation current, by titanium target plated film to pack alloy on the surface.The electric current applied during by controlling evaporation, time, thus control to make the thickness of the titanium film layer of formation be 1 ~ 10 μm.
Preferably, also plasma cleaning step can be carried out in vacuum chamber before vacuum coating: be 1 × 10 at vacuum chamber pressure
-4pa ~ 9 × 10
-4under Pa, passing into the argon gas of purity more than 99.99%, use plasma cleaning rifle to step 1) pack alloy after process carries out the clean of 5 ~ 30 minutes, removes surface impurity further.By utilizing the plasma cleaning chamber in vacuum chamber to remove surface impurity further, the titanium film layer formed after making evaporation coating is easy to attachment and is attached on pack alloy, makes both combine closely.
3) anodic oxidation: to step 2) process after pack alloy carry out anodized make in described titanium film layer partial-titanium rete oxidation formed titanium oxide layer, oxidation solution working concentration is sulfuric acid solution or the phosphoric acid solution of 100 ~ 200g/L, and after controlling to make anodized, the thickness of described titanium oxide layer and the ratio of the thickness of remaining titanium film layer are (1 ~ 3): 1.
In this step, the oxyacid soln of anodized can be phosphoric acid solution, salpeter solution and sulfuric acid solution.Preferably, phosphoric acid solution is adopted.Pass through anodic oxidation, the partial-titanium rete on pack alloy surface is made to be oxidized to titanium oxide layer, by controlling anodised technological parameter, such as temperature, electric current, time etc., the thickness of the titanium oxide layer formed after making oxidation processes is (1 ~ 3) with the ratio of the thickness of not oxidized residual titanium rete: 1.The thickness of controlled oxidization titanium layer is because if thickness is too thick, then the adhesion of titanium oxide layer and titanium film layer is inadequate, and both can not combine well; If thickness is too thin, then can not protect titanium film layer well, and oxidation appearance does not reach requirement yet.
4) sealing pores: to step 3) titanium oxide layer of pack alloy after process carries out sealing pores.
Because anodic oxidation is formed in the process of alumina layer, oxidation titanium film can form Minute pores, by this sealing pores, pore is closed, titanium oxide layer surface pores is few, smooth surface, also namely processes the pack alloy smooth surface obtained smooth.Preferably, the pack alloy after oxidation can be put into the normal temperature ion tank cleaning 10 ~ 15 minutes of 20 DEG C ± 5 DEG C, the de-ionized water tank then pack alloy being put into 80 DEG C ± 5 DEG C carries out the sealing pores of 10 ~ 15min.By this sealing pores mode, relative to the mode using hole sealing agent or plating, sealing of hole can be realized lower cost.In addition, if pack alloy surface is comparatively clean after anodic oxidation, also can not clean, the de-ionized water tank directly pack alloy being put into 80 DEG C ± 5 DEG C carries out the sealing pores of 10 ~ 15min.
Like this, by above-mentioned process, the surface of pack alloy is followed successively by titanium film layer, titanium oxide layer.Titanium film layer makes pack alloy have metal-like through the titanium oxide layer that surface is transparent, and the titanium oxide layer that oxidation processes is formed makes pack alloy have good appearance, makes the softer exquisiteness of metal-like.Because above-mentioned processing mode is carried out for pack alloy, therefore can reach 6 by pack alloy is and the appearance of 7 aluminium alloys being significantly reduce material cost, and pass through die cast, process complexity also significantly reduces, without the need to adopting tens road CNC operations again.Coordinate anodized by vacuum titanium plated film in processing procedure, technique is simply controlled, is applicable to large-scale industrial production application.
Through the pack alloy of above-mentioned process, as need specific occasion be used for, then simple CNC operation can be coordinated again to remove unnecessary auxiliary, be processed into the profile of required housing.It should be noted that, because preorder has formed the body contours structure of required housing by extrusion process, therefore CNC processing herein is only assisted and is removed unnecessary auxiliary for processing, but not as in the past the main profile relying on CNC operation to process required housing.Although this embodiment relates to CNC operation, only play booster action, so the operation that disposed of in its entirety operation is processed into housing than aluminium alloy is in the past simply too much.
This embodiment also provides a kind of mobile terminal, and it comprises housing, and housing adopts the pack alloy obtained according to above-mentioned disposal methods to make.Mobile terminal can be mobile phone, panel computer, notebook computer.Adopt pack alloy obtained above as the housing of mobile terminal, housing not only has metallic luster, and appearance is better, and the material cost of housing and processing cost lower than adopting on the market 6 are and housing that 7 aluminium alloys being are obtained all simultaneously.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, make some substituting or obvious modification without departing from the inventive concept of the premise, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. a surface treatment method for pack alloy, is characterized in that: comprise the following steps: after 1) pack alloy obtained by die cast being carried out Ultrasonic Cleaning, removes surface impurity; 2) use vacuum coating mode, the pressure in vacuum chamber remains on 6.5 × 10
-3more than Pa, passes into the argon gas of purity more than 99.99%, by the titanium target plated film of purity more than 99.99% to step 1) on pack alloy after process, make described pack alloy surface form a layer thickness at the titanium film layer of 1 ~ 10 μm; 3) to step 2) process after pack alloy carry out anodized make described titanium film layer segment be oxidized formed titanium oxide layer, oxidation solution working concentration is sulfuric acid solution or the phosphoric acid solution of 100 ~ 200g/L, and after controlling to make anodized, the thickness of described titanium oxide layer and the ratio of the thickness of remaining titanium film layer are (1 ~ 3): 1; 4) to step 3) titanium oxide layer of pack alloy after process carries out sealing pores.
2. the surface treatment method of pack alloy according to claim 1, is characterized in that: described step 2) in, before vacuum coating, also comprise plasma cleaning step: be 1 × 10 at vacuum chamber pressure
-4pa ~ 9 × 10
-4under Pa, passing into the argon gas of purity more than 99.99%, use plasma cleaning rifle to step 1) pack alloy after process carries out the clean of 5 ~ 30 minutes.
3. the surface treatment method of pack alloy according to claim 1, it is characterized in that: described step 4) be specially, by rapid 3) pack alloy after process puts into the ion tank cleaning 10 ~ 15 minutes of 20 DEG C ± 5 DEG C, and the de-ionized water tank then putting into 80 DEG C ± 5 DEG C carries out the sealing pores of 10 ~ 15min.
4. the surface treatment method of pack alloy according to claim 1, is characterized in that: described step 4) be specially, by rapid 3) pack alloy after the process de-ionized water tank of putting into 80 DEG C ± 5 DEG C carries out the sealing pores of 10 ~ 15min.
5. the surface treatment method of pack alloy according to claim 1, is characterized in that: also comprise step 5), described pack alloy is carried out CNC processing, removes unnecessary auxiliary, be processed into the profile of required housing.
6. the pack alloy that obtains of the surface treatment method process of the pack alloy according to any one of Claims 1 to 5.
7. a mobile terminal shell, is characterized in that: described housing is pack alloy according to claim 6.
8. a mobile terminal, is characterized in that: the housing of described mobile terminal is mobile terminal shell according to claim 7.
9. mobile terminal according to claim 8, is characterized in that: described mobile terminal is mobile phone, panel computer or notebook computer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639865A (en) * | 2019-01-15 | 2019-04-16 | 广东长盈精密技术有限公司 | The surface treatment method and mobile phone battery cover of mobile phone battery cover |
| CN115896731A (en) * | 2022-12-06 | 2023-04-04 | 等离子体装备科技(广州)有限公司 | Preparation process and processing equipment for metal shell of electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477529A (en) * | 2010-11-26 | 2012-05-30 | 鸿富锦精密工业（深圳）有限公司 | Vacuum coated component and production method thereof |
| US20120164438A1 (en) * | 2010-12-28 | 2012-06-28 | Hon Hai Precision Industry Co., Ltd. | Process for surface treating aluminum or aluminum alloy and article made with same |
| CN103052290A (en) * | 2011-10-14 | 2013-04-17 | 三星电子株式会社 | Electronic device case and method for treating surface thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477529A (en) * | 2010-11-26 | 2012-05-30 | 鸿富锦精密工业（深圳）有限公司 | Vacuum coated component and production method thereof |
| US20120164438A1 (en) * | 2010-12-28 | 2012-06-28 | Hon Hai Precision Industry Co., Ltd. | Process for surface treating aluminum or aluminum alloy and article made with same |
| CN103052290A (en) * | 2011-10-14 | 2013-04-17 | 三星电子株式会社 | Electronic device case and method for treating surface thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639865A (en) * | 2019-01-15 | 2019-04-16 | 广东长盈精密技术有限公司 | The surface treatment method and mobile phone battery cover of mobile phone battery cover |
| CN115896731A (en) * | 2022-12-06 | 2023-04-04 | 等离子体装备科技(广州)有限公司 | Preparation process and processing equipment for metal shell of electronic equipment |
| CN115896731B (en) * | 2022-12-06 | 2024-01-12 | 等离子体装备科技(广州)有限公司 | Preparation process and processing equipment for metal shell of electronic equipment |
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