CN103643277B - A kind of aluminium shell based on nanometer forming process and anode oxidation method thereof - Google Patents
A kind of aluminium shell based on nanometer forming process and anode oxidation method thereof Download PDFInfo
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- CN103643277B CN103643277B CN201310737462.7A CN201310737462A CN103643277B CN 103643277 B CN103643277 B CN 103643277B CN 201310737462 A CN201310737462 A CN 201310737462A CN 103643277 B CN103643277 B CN 103643277B
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Abstract
The present invention discloses a kind of aluminium shell based on nanometer forming process and anode oxidation method thereof, and described method comprises: by through the process of nanometer forming technique and carry out the aluminium shell after in-mould injection carry out at 90 DEG C ± 2 DEG C temperature foaming process; 14 ~ 20V voltage is adopted to carry out anodic oxidation 16 ~ 24min the aluminium shell after foaming process; By sealing of hole 8 ~ 12min at aluminium shell 85 ~ 100 DEG C of temperature of anodic oxidation.The present invention is by improving the innovation of the anode oxidation process of NMT aluminium shell, under the prerequisite ensureing aluminium shell appearance quality, greatly reduce the damaging influence that anode oxidation process produces the bonding force of NMT aluminium shell, make the plastic cement structure after surface treatment and metallic surface still maintain comparatively practical bonding force, and then be that the universal and application of NMT aluminium shell in smart mobile phone creates favourable condition.
Description
Technical field
The present invention relates to metal shell processing technique field, particularly relate to a kind of aluminium shell based on nanometer forming process and anode oxidation method thereof.
Background technology
Along with the universal of smart mobile phone and fast development, the screen of product is all larger, thickness is also thinner, this makes originally to adopt the bonnet of plastic rubber shaping to be difficult to meet the requirement of strength of currently available products again, and then adopt intensity better sheet metal be aided with injection moulding buckle, snap fit even the plastic cement structure such as stud to make the bonnet of product, such as, nanometer forming technique (NMT, NanoMoldingTechnology) is exactly that a kind of plastic cement that can allow is firmly bound to new technology on metallic surface.First this technology needs metal casing to do surface corrosion process, makes metal casing surface coverage one deck diameter be the nanoporous of 20 ~ 40nm, and then the metal casing after this process is carried out in-mould injection.Plastic cement can be made directly to be bonded on metal casing securely by this working method, and the integrity of metalwork outward appearance can not be destroyed again.
For aluminium shell, after injection moulding, usually anodised process of surface treatment all can be adopted to improve hardness, solidity to corrosion, the wear resistance of aluminium shell.And for the aluminium shell with plastic cement structure adopting NMT technology to prepare, the impact that anode oxidation process causes the plastic cement structure on aluminium shell also must be considered.
But, traditional anode oxidation process can produce serious detrimentally affect to the aluminium shell with plastic cement structure, cause the key property-plastic cement of NMT product and the bonding force of aluminium shell to decline to a great extent, and then limit the application of NMT aluminium shell in smart mobile phone.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of aluminium shell based on nanometer forming process and anode oxidation method thereof, be intended to solve at present due to problem that anode oxidation process causes NMT aluminium shell and plastic cement bonding force to decline.
Technical scheme of the present invention is as follows:
Based on an aluminium shell anode oxidation method for nanometer forming process, wherein, described method comprises:
By after the process of nanometer forming technique and the aluminium shell carrying out in-mould injection carries out foaming process at 90 ± 2 DEG C of temperature;
14 ~ 20V voltage is adopted to carry out anodic oxidation 16 ~ 24min the aluminium shell after foaming process;
By sealing of hole 8 ~ 12min at aluminium shell 85 ~ 100 DEG C of temperature of anodic oxidation.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, described aluminium shell carried out sandblasting before foaming process, and sandblast machine adopts the pressure of 19.61 ~ 23.54 Ns to carry out sandblasting.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, the aluminium shell after sandblasting soaks 6 ~ 10min and carries out degreasing in the tank containing 6% ~ 12% neutral degreaser agent.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, described aluminium shell after foaming process at room temperature in and 8 ~ 12s, and carry out washed with de-ionized water.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, is carrying out, in washed with de-ionized water process, in deionized water, passing into pressurized air.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, the aluminium shell of described anodic oxidation dyeed before sealing of hole, and dye 2.5 ~ 4.5min at 45 ~ 65 DEG C of temperature.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, aluminium shell is washed after sealing of hole, and at 80 ~ 100 DEG C of temperature air-dry 8 ~ 12min.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, described foaming process in adopt concentration be 98% sulfuric acid foam, foamed time is 8 ~ 12s.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, the anodic oxidation of described aluminium shell is carried out at 16 ~ 24 DEG C of temperature.
Based on an aluminium shell for nanometer forming process, wherein, described aluminium shell after the process of nanometer forming technique as described above anode oxidation method process.
Beneficial effect: the invention provides a kind of aluminium shell based on nanometer forming process and anode oxidation method thereof.Improved by the innovation of the anode oxidation process to NMT aluminium shell, under the prerequisite ensureing aluminium shell appearance quality, greatly reduce the damaging influence that anode oxidation process produces the bonding force of NMT aluminium shell, make the plastic cement structure after surface treatment and metallic surface still maintain comparatively practical bonding force, and then be that the universal and application of NMT aluminium shell in smart mobile phone creates favourable condition.
Accompanying drawing explanation
Fig. 1 is the aluminium shell and the plastic cement draw ring integrated structure schematic diagram that the present invention is based on nanometer forming process.
Schematic diagram when Fig. 2 is the aluminium shell test bonding force that the present invention is based on nanometer forming process.
Embodiment
The invention provides a kind of aluminium shell based on nanometer forming process and anode oxidation method thereof.For making object of the present invention, technical scheme and effect clearly, clearly, the present invention is described in more detail below.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Due to strong acid and highly basic can be used in anode oxidation process, the present invention adopts the polyphenylene sulfide (PPS) with excellent chemical corrosive nature to test as the material of plastic cement structure for this reason, by aluminium shell of the present invention after NMT technical finesse again at its surperficial injection moulding PPS plastic cement.
Aluminium shell anode oxidation method based on nanometer forming process of the present invention, the method comprises:
The aluminium shell of injection moulding PPS plastics is carried out at 90 DEG C ± 2 DEG C temperature foaming process, sulfuric acid concentration 98% used, the used time is 8 ~ 12s.
Aluminium shell after foaming process is carried out anodic oxidation treatment, applied voltage 14 ~ 20V, used time 16 ~ 24min at 16 ~ 24 DEG C of temperature.
Aluminium shell after anodic oxidation is carried out sealing pores at 85 ~ 100 DEG C of temperature, used time 8 ~ 12min.Sealing pores can improve the wear resistance of the anode oxide film of aluminium shell, erosion resistance and electrical insulating property.
The present invention, by reducing the blowing temperature in anode oxidation process, reduces the corrosive nature that the sulfuric acid in anodic oxidation treatment produces NMT aluminium shell, makes suffered infringement of the bonding force of aluminium shell and plastic parts drop to bottom line.
In preferred embodiment, described aluminium shell can carry out sandblasting before foaming process, cleared up aluminium shell surface, form the hair side that metallic color is consistent, also be conducive to improving the strength of joint between conjunction, wherein, sandblasting sandblast machine adopts the pressure of 2.0 ~ 2.4kg to carry out sandblasting.
In preferred embodiment, the aluminium shell after sandblasting can be soaked in the tank filling 6% ~ 12% neutral degreaser agent 6 ~ 10min and carry out skimming treatment, temperature is room temperature, then rinses with clear water.
The model that described neutral degreaser agent preferably adopts Guangzhou Su Jie Science and Technology Ltd. to produce is the neutral degreaser agent of ST202, or the model that Dongguan City Sen Yuan Chemical Co., Ltd. produces is the neutral degreaser agent of CA-Q02, or the model of Guangzhou Qi Wei Chemical Co., Ltd. production is the neutral degreaser agent of QW-909.
Why the present invention adopts neutral degreaser agent to substitute traditional acidity or alkaline degreaser, because the corrodibility of neutral degreaser agent is lower, not only effectively can remove the greasy dirt of workpiece surface, effectively can also alleviate the corrosive nature that PPS plastic cement and aluminium shell are produced, thus keep the bonding force between PPS plastic cement and aluminium shell.Also can be aided with the degreasing effect of ultrasonic wave raising to workpiece in this step in the lump.
In preferred embodiment, carry out after foaming also can passing into pressurized air in the process of cleaning, to utilize the surging force of bubble to improve cleaning performance to plastic cement and melts combine place, reduce the impact that corrosive residue produces its bonding force thus as much as possible.
In preferred embodiment, described aluminium shell after foaming process at room temperature in and 8 ~ 12s, then carry out washed with de-ionized water, then carry out anodic oxidation.
In preferred embodiment, the aluminium shell of described anodic oxidation dyeed before sealing of hole, and dye 2.5 ~ 4.5min at 45 ~ 65 DEG C of temperature.In dyeing course, aluminum products immerse in dyestuff, and dye molecule diffuses in the fenestra of oxide film and forms covalent linkage and ionic linkage with oxide film, afterwards through sealing pores, by the fixing of dye in fenestra.
In preferred embodiment, after sealing of hole, described aluminium shell is washed, and at 80 ~ 100 DEG C of temperature air-dry 8 ~ 12min.
The present invention also protects a kind of aluminium shell based on nanometer forming process, wherein, described aluminium shell after the process of nanometer forming technique as described above anode oxidation method process.
For relatively on the impact of NMT aluminium shell surface plastic parts bonding force, the present invention is measured by following specific embodiment.
First have employed the trade mark be 5052 aluminum alloy plate materials be prepared into aluminium shell 100 as shown in Figure 1 by impact briquetting, for the impact that checking anode oxidation process causes, within it surface goes out one for testing the plastic parts 200 of drawing force by NMT technology PPS plastic-injection, and the area of junction is 7mm × 8mm.
Secondly after anode oxidation surface processing process, carry out test bonding force experiment as shown in Figure 2 again, plastic parts 200 is tensile test ring, by applying one to measure bonding force between plastic cement and metal size perpendicular to the drawing force of itself and aluminium shell bonding surface on this tensile test ring.
Embodiment 1
The anode oxidation process concrete steps adopted in embodiment 1 and parameter as follows:
1, sandblasting: sandblasting is carried out to aluminium shell, pressure 2.2kg used;
2, degreasing: carry out degreasing 12s with the sulfuric acid that concentration is 30% at 70 DEG C of temperature, then wash;
3, alkaline etching: be the NaOH alkaline etching 10s of 20% by concentration at 55 DEG C of temperature, then wash;
4, neutralize: be in the nitric acid of 30% at ambient temperature by concentration and 10s, then wash;
5, change and grind (or foaming): the sulfuric acid of working concentration 98% foams 10s at 100 DEG C of temperature, then washes;
6, neutralize: at ambient temperature and 10s, then wash;
7, anodic oxidation: use 16V voltage, carry out anodic oxidation at 20 DEG C of temperature, treatment time 20min, then washes;
8, dye: dye 3.5min at 55 DEG C of temperature, then washes;
9, sealing of hole: carry out sealing of hole 10min at 85 DEG C of temperature, then wash;
10, air-dry: air-dry 10min at 90 DEG C of temperature.
Before carrying out anodic oxidation treatment, the average bonding force on plastic cement and aluminium shell surface is 126N, and after the anodic oxidation treatment of embodiment 1, the average bonding force on plastic cement and aluminium shell surface is down to 80.5N, bonding force have lost 36%, and the aluminium shell as seen after the anodic oxidation treatment of embodiment 1 can not meet the mechanical requirements of product structure design.
Embodiment 2
The anode oxidation process concrete steps adopted in embodiment 2 and parameter as follows:
1, sandblasting: sandblast machine pressure used is 2.2kg;
2, degreasing: be the sulfuric acid degreasing 12s of 30% by concentration at 70 DEG C, then wash;
3, alkaline etching: be the NaOH process 10s of 20% by concentration at 55 DEG C of temperature, then wash;
4, neutralize: be the nitric acid treatment 10s of 30% by concentration at ambient temperature, then wash;
5, change is ground (or foaming): use 98% sulfuric acid concentration to process 10s at the temperature of 90 DEG C, then wash;
6, neutralize: process 10s at ambient temperature, then wash;
7, anodic oxidation: use 16V voltage, process 20min at 20 DEG C of temperature, then wash, adopt washed with de-ionized water again after washing;
8, dye: at 55 DEG C of temperature, process 3.5min, after washing, adopt washed with de-ionized water again;
9, sealing of hole: process 10min at 85 DEG C of temperature, then wash;
10, air-dry: air-dry 10min at 90 DEG C of temperature.
NMT aluminium shell after the anode oxidation method process of above-mentioned setting, the average bonding force on its plastic cement and aluminium shell surface is down to 102.6N, than reducing 126-102.6=23.4N before non-anodic oxidation treatment, bonding force have lost 18.6%, 17.4% is reduced compared to the loss of embodiment 1 pair of bonding force, this illustrates that the present invention reduces the loss that blowing temperature can effectively reduce plastic cement and NMT aluminium shell bonding force, is applicable to doing the less demanding buckle of some bonding forces or coupler construction according to the size of its bonding force.
Embodiment 3
Embodiment 3 uses the anode oxidation process parameter in embodiment 1, in the immovable situation of other processing parameters, only save alkaline etching and afterwards in and operation, NMT aluminium shell after the anodic oxidation treatment of above-mentioned setting, the average bonding force on its plastic cement and aluminium shell surface is down to 104.6N, than reducing 126-104.6=21.4N before non-anodic oxidation treatment, bonding force have lost 17%, 19% is reduced compared to the loss of embodiment 1 pair of bonding force, this illustrate the present invention save alkaline etching and in and operation also effectively can reduce the loss of plastic cement and NMT aluminium shell bonding force, be applicable to doing the less demanding buckle of some bonding forces or coupler construction according to the size of its bonding force.
Embodiment 4
Embodiment 4 also uses the anode oxidation process parameter in embodiment 1, but in the immovable situation of other processing parameters, only the sulfuric acid of used for the 2nd step degreasing 30% is changed into the neutral degreaser agent that the model adopting Dongguan City Sen Yuan Chemical Co., Ltd. to produce is CA-Q02, by aluminium shell fill 9% neutral degreaser agent tank in soak 8min and carry out degreasing, temperature is room temperature, then rinses with clear water.NMT aluminium shell after the anodic oxidation treatment of above-mentioned setting, the average bonding force on its plastic cement and aluminium shell surface is down to 94.5N, than reducing 126-94.5=31.5N before non-anodic oxidation treatment, bonding force have lost 25%, 11% is reduced compared to the loss of embodiment 1 pair of bonding force, this illustrates that the present invention adopts the way of neutral degreaser agent also can reduce the loss of plastic cement and NMT aluminum hull bonding force, is applicable to doing the not high buckle of ask for something or coupler construction according to the size of its bonding force.
Embodiment 5
The anode oxidation process concrete steps adopted in embodiment 5 and parameter as follows:
1, sandblasting: sandblast machine pressure used is 2.2kg;
2, degreasing: by aluminium shell fill 9% neutral degreaser agent tank in soak 8min, temperature is room temperature, then rinses with clear water;
3, change is ground (or foaming): use 98% sulfuric acid concentration to process 10s at 90 DEG C of temperature, then wash;
4, neutralize: process 10s at ambient temperature, then wash;
5, anodic oxidation: use 16V voltage, process 20min at 20 DEG C of temperature, adopt washed with de-ionized water again after washing;
6, dye: at 55 DEG C of temperature, process 3.5min, after washing, adopt washed with de-ionized water again;
7, sealing of hole: process 10min at 85 DEG C of temperature, then wash;
8, air-dry: air-dry 10min at 90 DEG C of temperature.
Adopt the NMT aluminium shell after the anodic oxidation treatment of embodiment 5, the average bonding force on its plastic cement and aluminium shell surface is only reduced to 115.9N, than reducing 126-115.9=10.1N before non-anodic oxidation treatment, bonding force only have lost 8%, 28% is reduced compared to the loss of embodiment 1 pair of bonding force, this illustrate the present invention save alkaline etching and in and operation, reduce blowing temperature and adopt the way of neutral degreaser agent to substantially reduce the loss of plastic cement and NMT aluminum hull bonding force, be enough to the requirement of strength meeting aluminium shell surface bonding plastic cement stud or coupler construction, be applicable to doing the higher stud of some bonding forces or coupler construction.
Embodiment 6
1, sandblasting: sandblast machine pressure used is 2.0kg;
2, degreasing: by aluminium shell fill 6% neutral degreaser agent tank in soak 6min, temperature is room temperature, then rinses with clear water;
3, change is ground (or foaming): use 98% sulfuric acid concentration to process 12s at 88 DEG C of temperature, then wash;
4, neutralize: process 12s at ambient temperature, then wash;
5, anodic oxidation: use 15V voltage, process 24min at 24 DEG C of temperature, adopt washed with de-ionized water again after washing;
6, dye: at 45 DEG C of temperature, process 4.5min, after washing, adopt washed with de-ionized water again;
7, sealing of hole: process 12min at 90 DEG C of temperature, then wash;
8, air-dry: air-dry 12min at 80 DEG C of temperature.
Adopt the NMT aluminium shell after the anodic oxidation treatment of embodiment 6, the average bonding force on its plastic cement and aluminium shell surface is only reduced to 114N, than reducing 126-114=12N before non-anodic oxidation treatment, bonding force only have lost 9.5%, , 26.5% is reduced compared to the loss of embodiment 1 pair of bonding force, this illustrate the present invention save alkaline etching and in and operation, reduce blowing temperature and adopt the way of neutral degreaser agent to substantially reduce the loss of plastic cement and NMT aluminum hull bonding force, be enough to the requirement of strength meeting aluminium shell surface bonding plastic cement stud or coupler construction, be applicable to doing the higher stud of some bonding forces or coupler construction.
Embodiment 7
1, sandblasting: sandblast machine pressure used is 2.4kg;
2, degreasing: by aluminium shell fill 12% neutral degreaser agent tank in soak 10min, temperature is room temperature, then rinses with clear water;
3, change is ground (or foaming): use 98% sulfuric acid concentration to process 12s at 92 DEG C of temperature, then wash;
4, neutralize: process 8s at ambient temperature, then wash;
5, anodic oxidation: use 18V voltage, process 16min at 16 DEG C of temperature, adopt washed with de-ionized water again after washing;
6, dye: at 65 DEG C of temperature, process 2.5min, after washing, adopt washed with de-ionized water again;
7, sealing of hole: process 8min at 95 DEG C of temperature, then wash;
8, air-dry: air-dry 8min at 100 DEG C of temperature.
Adopt the NMT aluminium shell after the anodic oxidation treatment of embodiment 7, the average bonding force on its plastic cement and aluminium shell surface is only reduced to 110.5N, than reducing 126-110.5=15.5N before non-anodic oxidation treatment, bonding force only have lost 12.3%, , 23.7% is reduced compared to the loss of embodiment 1 pair of bonding force, this illustrate the present invention save alkaline etching and in and operation, reduce blowing temperature and adopt the way of neutral degreaser agent to substantially reduce the loss of plastic cement and NMT aluminum hull bonding force, be enough to the requirement of strength meeting aluminium shell surface bonding plastic cement stud or coupler construction, be applicable to doing the higher stud of some bonding forces or coupler construction.
Visible, verify through above-mentioned kinds of experiments, the anode oxidation method after the present invention improves reduces the weakening effect of the bonding force to NMT aluminium shell really, ensure that bonding force higher between plastic parts and NMT aluminium shell.
The invention provides a kind of aluminium shell based on nanometer forming process and anode oxidation method thereof, improved by the innovation of the anode oxidation process to NMT aluminium shell, under the prerequisite ensureing aluminium shell appearance quality, greatly reduce the damaging influence that anode oxidation process produces the bonding force of NMT aluminium shell, make the plastic cement structure after surface treatment and metallic surface still maintain comparatively practical bonding force, and then be that the universal and application of NMT aluminium shell in smart mobile phone creates favourable condition.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (10)
1. based on an aluminium shell anode oxidation method for nanometer forming process, it is characterized in that, described method comprises:
By through the process of nanometer forming technique and carry out the aluminium shell after in-mould injection carry out at 90 DEG C ± 2 DEG C temperature foaming process;
14 ~ 20V voltage is adopted to carry out anodic oxidation 16 ~ 24min the aluminium shell after foaming process;
By sealing of hole 8 ~ 12min at aluminium shell 85 ~ 100 DEG C of temperature of anodic oxidation.
2. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, is characterized in that, described aluminium shell carried out sandblasting before foaming process, and sandblast machine adopts the pressure of 19.61 ~ 23.54 Ns to carry out sandblasting.
3. the aluminium shell anode oxidation method based on nanometer forming process according to claim 2, is characterized in that, the aluminium shell after sandblasting soaks 6 ~ 10min and carries out degreasing in the tank containing 6% ~ 12% neutral degreaser agent.
4. the aluminium shell anode oxidation method based on nanometer forming process according to claim 3, is characterized in that, is carrying out, in washed with de-ionized water process, in deionized water, passing into pressurized air.
5. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, is characterized in that, described aluminium shell after foaming process at room temperature in and 8 ~ 12s, and carry out washed with de-ionized water.
6. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, it is characterized in that, the aluminium shell of described anodic oxidation dyeed before sealing of hole, and dye 2.5 ~ 4.5min at 45 ~ 65 DEG C of temperature.
7. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, it is characterized in that, described aluminium shell is washed after sealing of hole, and at 80 ~ 100 DEG C of temperature air-dry 8 ~ 12min.
8. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, is characterized in that, described foaming process in adopt concentration be 98% sulfuric acid foam, foamed time is 8 ~ 12s.
9. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, is characterized in that, the anodic oxidation of described aluminium shell is carried out at 16 ~ 24 DEG C of temperature.
10. based on an aluminium shell for nanometer forming process, it is characterized in that, described aluminium shell processes according to the anode oxidation method as described in any one of claim 1-9 after the process of nanometer forming technique.
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| CN104618538B (en) * | 2015-02-06 | 2017-06-06 | 福建省石狮市通达电器有限公司 | A kind of aftertreatment technology of cell phone rear cover |
| CN106555214B (en) * | 2015-09-25 | 2019-05-17 | 比亚迪股份有限公司 | The preparation method of metal surface microporous processing method and metal-resin composite |
| CN106884193B (en) * | 2016-12-30 | 2018-07-27 | 广东长盈精密技术有限公司 | The preparation method of alloy-plastic combined case |
| CN109722696A (en) * | 2019-03-05 | 2019-05-07 | 东莞金稞电子科技有限公司 | A kind of three color gradual change dyeing of aluminum alloy anode |
| CN110552041B (en) * | 2019-09-16 | 2021-02-19 | 歌尔股份有限公司 | Surface treatment method for metal material |
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