CN103643277A - Aluminum shell based on nano molding machining and anode oxidation method thereof - Google Patents
Aluminum shell based on nano molding machining and anode oxidation method thereof Download PDFInfo
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Abstract
The invention discloses an aluminum shell based on nano molding machining and an anode oxidation method of the aluminum shell. The method comprises the following steps: performing foaming treatment on the aluminum shell at the temperature of 90+/-2 DEG C, wherein the aluminum shell is subjected to nano molding technology treatment and in-mold injection molding; performing anodic oxidation on the aluminum shell for 16-24 minutes at voltage of 14-20V, wherein the aluminum shell is subjected to foaming treatment; performing hole sealing on the aluminum shell subjected to anode oxidation for 8-12 minutes at the temperature of 85-100 DEG C. Through innovative improvement on an anode oxidation process of NMT (Nano Molding Technology) aluminum shell, on premise that the appearance quality of the surface of the aluminum shell is ensured, the damage influence on the binding force of the NMT aluminum shell caused by the anode oxidation process is greatly reduced, and practical binding forces of a plastic structure and a metal surface subjected to surface treatment are still maintained, so that beneficial conditions are provided for popularization and application of the NMT aluminum shell in smart phones.
Description
Technical field
The present invention relates to metal shell processing technique field, relate in particular to a kind of aluminium shell and anode oxidation method thereof based on nanometer forming process.
Background technology
Universal and fast development along with smart mobile phone, 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 the better sheet metal of intensity be aided with injection moulding buckle, snap fit even the plastic cement structure such as double-screw bolt make the bonnet of product, for example, nanometer forming technique (NMT, Nano Molding Technology) is exactly that a kind of plastic cement mortise that can allow is to the new technology on metallic surface.First this technology needs that metal casing is done to surface corrosion processes, and makes the nanoporous that metal casing surface coverage one deck diameter is 20 ~ 40nm, and then the metal casing after this processing is carried out to in-mould injection.By this working method, can make plastic cement directly be bonded on metal casing securely, and can not destroy again the integrity of metalwork outward appearance.
For aluminium shell, after injection moulding, conventionally all can adopt anodised process of surface treatment to improve hardness, solidity to corrosion, the wear resistance of aluminium shell.And for the aluminium shell with plastic cement structure that adopts NMT technology to prepare, also must consider the impact that anode oxidation process causes the plastic cement structure on aluminium shell.
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 limited 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 and anode oxidation method thereof based on nanometer forming process, be intended to solve the problem that causes NMT aluminium shell and plastic cement bonding force to decline due to anode oxidation process at present.
Technical scheme of the present invention is as follows:
An aluminium shell anode oxidation method based on nanometer forming process, wherein, described method comprises:
By after nanometer forming technique is processed and the aluminium shell that the carries out in-mould injection processing of foaming at 90 ± 2 ℃ of temperature;
Aluminium shell after foaming is processed adopts 14 ~ 20V voltage to carry out anodic oxidation 16 ~ 24min;
By sealing of hole 8 ~ 12min at 85 ~ 100 ℃ of temperature of the aluminium shell of anodic oxidation.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, described aluminium shell carried out sandblast before foaming is processed, and sandblast machine adopts the pressure of 2.0 ~ 2.4kg to carry out sandblast.
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 that contains 6% ~ 12% neutral degreaser agent.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, described aluminium shell after foaming is processed at room temperature in 8 ~ 12s, and carry out washed with de-ionized water.
The described aluminium shell anode oxidation method based on nanometer forming process wherein, in carrying out washed with de-ionized water process, passes into pressurized air in deionized water.
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 2.5 ~ 4.5min dyes at 45 ~ 65 ℃ 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 ℃ of temperature air-dry 8 ~ 12min.
The described aluminium shell anode oxidation method based on nanometer forming process, wherein, described foaming adopts concentration in processing be that 98% sulfuric acid foams, 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 ℃ of temperature.
An aluminium shell based on nanometer forming process, wherein, described aluminium shell after nanometer forming technique is processed as described above anode oxidation method process.
Beneficial effect: the invention provides a kind of aluminium shell and anode oxidation method thereof based on nanometer forming process.By the innovation of the anode oxidation process of NMT aluminium shell is improved, guaranteeing under the prerequisite of aluminium shell appearance quality, greatly reduce the damaging influence that anode oxidation process produces the bonding force of NMT aluminium shell, make still retaining comparatively practical bonding force through the plastic cement structure after surface treatment and metallic surface, and then be that favourable condition has been created in the universal and application of NMT aluminium shell in smart mobile phone.
Accompanying drawing explanation
Fig. 1 is aluminium shell and the plastic cement draw ring integrated structure schematic diagram that the present invention is based on nanometer forming process.
Fig. 2 is the schematic diagram while the present invention is based on the aluminium shell test bonding force of nanometer forming process.
Embodiment
The invention provides a kind of aluminium shell and anode oxidation method thereof based on nanometer forming process.For making object of the present invention, technical scheme and effect clearer, clear and definite, below the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Owing to can using strong acid and highly basic 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 foamed at 90 ℃ ± 2 ℃ temperature processing, sulfuric acid concentration 98% used, the used time is 8 ~ 12s.
Aluminium shell after foaming is processed carries out anodic oxidation treatment, applied voltage 14 ~ 20V, used time 16 ~ 24min at 16 ~ 24 ℃ of temperature.
Aluminium shell after anodic oxidation is carried out to sealing of hole processing at 85 ~ 100 ℃ of temperature, used time 8 ~ 12min.Sealing of hole is processed wear resistance, erosion resistance and the electrical insulating property of the anode oxide film that can improve aluminium shell.
The present invention, by reducing the blowing temperature in anode oxidation process, has reduced the corrosive nature that the sulfuric acid in anodic oxidation treatment produces NMT aluminium shell, makes the suffered infringement of bonding force of aluminium shell and plastic parts drop to bottom line.
In preferred embodiment, described aluminium shell can carry out sandblasting before foaming is processed, and aluminium shell surface is cleared up, form the consistent hair side of metallic color, also be conducive to improve the strength of joint between conjunction, wherein, sandblast adopts the pressure of 2.0 ~ 2.4kg to carry out sandblast with sandblast machine.
In preferred embodiment, the aluminium shell after sandblasting can be soaked in the tank that fills 6% ~ 12% neutral degreaser agent to 6 ~ 10min and carry out skimming treatment, temperature is room temperature, then with clear water, rinses.
The neutral degreaser agent that the model that described neutral degreaser agent preferably adopts Guangzhou Su Jie Science and Technology Ltd. to produce is ST202, or the neutral degreaser agent that the model that Dongguan City Sen Yuan Chemical Co., Ltd. produces is CA-Q02, or the neutral degreaser agent that is QW-909 of the Guangzhou Qi Wei Chemical Co., Ltd. model of producing.
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 can effectively remove the greasy dirt of workpiece surface, can also effectively alleviate the corrosive nature to PPS plastic cement and aluminium shell generation, thereby keep the bonding force between PPS plastic cement and aluminium shell.In this step, also can be aided with in the lump ultrasonic wave and improve the degreasing effect to workpiece.
In preferred embodiment, in the process of cleaning, also can pass into pressurized air after foaming, to utilize the surging force of bubble to improve the cleaning performance to plastic cement and melts combine place, reduce as much as possible thus the impact that corrosive residue produces its bonding force.
In preferred embodiment, described aluminium shell after foaming is processed at room temperature in 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 2.5 ~ 4.5min dyes at 45 ~ 65 ℃ 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, through sealing of hole, process afterwards, by the fixing of dye in fenestra.
In preferred embodiment, after sealing of hole, described aluminium shell is washed, and at 80 ~ 100 ℃ 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 nanometer forming technique is processed as described above anode oxidation method process.
For the relatively impact on NMT aluminium shell surface plastic parts bonding force, the present invention measures by following specific embodiment.
First adopted the aluminum alloy plate materials that the trade mark is 5052 to be prepared into aluminium shell 100 as shown in Figure 1 by impact briquetting, for the impact of verifying that anode oxidation process causes, side surface goes out one for testing the plastic parts 200 of drawing force by NMT technology PPS plastic-injection within it, and the area of junction is 7mm * 8mm.
Secondly after anode oxidation surface processing process, carry out again test bonding force experiment as shown in Figure 2, plastic parts 200 is tensile test ring, by apply one on this tensile test ring, perpendicular to the drawing force of itself and aluminium shell bonding surface, measures the size of bonding force between plastic cement and metal.
Embodiment 1
The anode oxidation process concrete steps and the parameter that in embodiment 1, adopt are as follows:
1, sandblast: aluminium shell is carried out to sandblasting, pressure 2.2kg used;
2, degreasing: the sulfuric acid that is 30% by concentration at 70 ℃ of temperature carries out degreasing 12s, then washes;
3, alkaline etching: the NaOH alkaline etching 10s that is 20% by concentration at 55 ℃ of temperature, then washes;
4, neutralization: in the nitric acid that is 30% by concentration at ambient temperature and 10s, then wash;
5, change and to grind (or foaming): the sulfuric acid of working concentration 98% 10s that foams at 100 ℃ of temperature, then washes;
6, neutralization: at ambient temperature and 10s, then wash;
7, anodic oxidation: use 16V voltage, carry out anodic oxidation at 20 ℃ of temperature, treatment time 20min, then washes;
8, dyeing: the 3.5min that dyes at 55 ℃ of temperature, then washes;
9, sealing of hole: carry out sealing of hole 10min at 85 ℃ of temperature, then wash;
10, air-dry: air-dry 10min at 90 ℃ of temperature.
Before carrying out anodic oxidation treatment, the average bonding force on plastic cement and aluminium shell surface is 126N, and through after the anodic oxidation treatment of embodiment 1, the average bonding force on plastic cement and aluminium shell surface has been down to 80.5N, bonding force has lost 36%, and visible aluminium shell after the anodic oxidation treatment of embodiment 1 can not meet the mechanics requirement of product structure design.
Embodiment 2
The anode oxidation process concrete steps and the parameter that in embodiment 2, adopt are as follows:
1, sandblast: sandblast machine pressure used is 2.2kg;
2, degreasing: the sulfuric acid degreasing 12s that is 30% by concentration at 70 ℃, then washes;
3, alkaline etching: the NaOH that is 20% by concentration at 55 ℃ of temperature processes 10s, then washes;
4, neutralization: the nitric acid treatment 10s that is 30% by concentration at ambient temperature, then washes;
5, change and grind (or foaming): use 98% sulfuric acid concentration to process 10s at the temperature of 90 ℃, then wash;
6, neutralization: process at ambient temperature 10s, then wash;
7, anodic oxidation: use 16V voltage, process 20min at 20 ℃ of temperature, then wash, adopt again washed with de-ionized water after washing;
8, dyeing: process 3.5min at 55 ℃ of temperature, adopt again washed with de-ionized water after washing;
9, sealing of hole: process 10min at 85 ℃ of temperature, then wash;
10, air-dry: air-dry 10min at 90 ℃ of temperature.
NMT aluminium shell after the anode oxidation method of above-mentioned setting is processed, the average bonding force on its plastic cement and aluminium shell surface is down to 102.6N, than, before anodic oxidation treatment, do not reduced 126-102.6=23.4N, bonding force has lost 18.6%, loss than 1 pair of bonding force of embodiment reduces 17.4%, this explanation 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
The anode oxidation process parameter that embodiment 3 is used 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, before anodic oxidation treatment, do not reduced 126-104.6=21.4N, bonding force has lost 17%, loss than 1 pair of bonding force of embodiment reduces 19%, this explanation the present invention save alkaline etching and in and operation also can effectively 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 is also used the anode oxidation process parameter in embodiment 1, but in the immovable situation of other processing parameters, the neutral degreaser agent that only the 2nd step degreasing 30% sulfuric acid used to be changed into the model that adopts Dongguan City Sen Yuan Chemical Co., Ltd. to produce be CA-Q02, aluminium shell is soaked to 8min in filling the tank of 9% neutral degreaser agent and carry out degreasing, temperature is room temperature, then with clear water, rinses.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, before anodic oxidation treatment, do not reduced 126-94.5=31.5N, bonding force has lost 25%, loss than 1 pair of bonding force of embodiment reduces 11%, this explanation 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 according to the size of its bonding force buckle or the coupler construction that ask for something is not high.
Embodiment 5
The anode oxidation process concrete steps and the parameter that in embodiment 5, adopt are as follows:
1, sandblast: sandblast machine pressure used is 2.2kg;
2, degreasing: aluminium shell is soaked to 8min in filling the tank of 9% neutral degreaser agent, and temperature is room temperature, then rinses with clear water;
3, change and grind (or foaming): use 98% sulfuric acid concentration to process 10s at 90 ℃ of temperature, then wash;
4, neutralization: process at ambient temperature 10s, then wash;
5, anodic oxidation: use 16V voltage, process 20min at 20 ℃ of temperature, adopt again washed with de-ionized water after washing;
6, dyeing: process 3.5min at 55 ℃ of temperature, adopt again washed with de-ionized water after washing;
7, sealing of hole: process 10min at 85 ℃ of temperature, then wash;
8, air-dry: air-dry 10min at 90 ℃ of temperature.
NMT aluminium shell after the anodic oxidation treatment of employing embodiment 5, the average bonding force on its plastic cement and aluminium shell surface is only reduced to 115.9N, than, before anodic oxidation treatment, do not reduced 126-115.9=10.1N, bonding force has only lost 8%, loss than 1 pair of bonding force of embodiment reduces 28%, this explanation the present invention save alkaline etching and in and operation, the way that reduces blowing temperature and the agent of employing neutral degreaser has reduced the loss of plastic cement and NMT aluminum hull bonding force greatly, be enough to meet the requirement of strength of aluminium shell surface bonding plastic cement double-screw bolt or coupler construction, be applicable to doing double-screw bolt or the coupler construction that some bonding forces are higher.
Embodiment 6
1, sandblast: sandblast machine pressure used is 2.0kg;
2, degreasing: aluminium shell is soaked to 6min in filling the tank of 6% neutral degreaser agent, and temperature is room temperature, then rinses with clear water;
3, change and grind (or foaming): use 98% sulfuric acid concentration to process 12s at 88 ℃ of temperature, then wash;
4, neutralization: process at ambient temperature 12s, then wash;
5, anodic oxidation: use 15V voltage, process 24min at 24 ℃ of temperature, adopt again washed with de-ionized water after washing;
6, dyeing: process 4.5min at 45 ℃ of temperature, adopt again washed with de-ionized water after washing;
7, sealing of hole: process 12min at 90 ℃ of temperature, then wash;
8, air-dry: air-dry 12min at 80 ℃ of temperature.
NMT aluminium shell after the anodic oxidation treatment of employing embodiment 6, the average bonding force on its plastic cement and aluminium shell surface is only reduced to 114N, than, before anodic oxidation treatment, do not reduced 126-114=12N, bonding force has only lost 9.5%, , loss than 1 pair of bonding force of embodiment reduces 26.5%, this explanation the present invention save alkaline etching and in and operation, the way that reduces blowing temperature and the agent of employing neutral degreaser has reduced the loss of plastic cement and NMT aluminum hull bonding force greatly, be enough to meet the requirement of strength of aluminium shell surface bonding plastic cement double-screw bolt or coupler construction, be applicable to doing double-screw bolt or the coupler construction that some bonding forces are higher.
Embodiment 7
1, sandblast: sandblast machine pressure used is 2.4kg;
2, degreasing: aluminium shell is soaked to 10min in filling the tank of 12% neutral degreaser agent, and temperature is room temperature, then rinses with clear water;
3, change and grind (or foaming): use 98% sulfuric acid concentration to process 12s at 92 ℃ of temperature, then wash;
4, neutralization: process at ambient temperature 8s, then wash;
5, anodic oxidation: use 18V voltage, process 16min at 16 ℃ of temperature, adopt again washed with de-ionized water after washing;
6, dyeing: process 2.5min at 65 ℃ of temperature, adopt again washed with de-ionized water after washing;
7, sealing of hole: process 8min at 95 ℃ of temperature, then wash;
8, air-dry: air-dry 8min at 100 ℃ of temperature.
NMT aluminium shell after the anodic oxidation treatment of employing embodiment 7, the average bonding force on its plastic cement and aluminium shell surface is only reduced to 110.5N, than, before anodic oxidation treatment, do not reduced 126-110.5=15.5N, bonding force has only lost 12.3%, , loss than 1 pair of bonding force of embodiment reduces 23.7%, this explanation the present invention save alkaline etching and in and operation, the way that reduces blowing temperature and the agent of employing neutral degreaser has reduced the loss of plastic cement and NMT aluminum hull bonding force greatly, be enough to meet the requirement of strength of aluminium shell surface bonding plastic cement double-screw bolt or coupler construction, be applicable to doing double-screw bolt or the coupler construction that some bonding forces are higher.
Visible, through above-mentioned kinds of experiments checking, the anode oxidation method after the present invention improves has reduced the weakening effect to the bonding force of NMT aluminium shell really, has guaranteed bonding force higher between plastic parts and NMT aluminium shell.
The invention provides a kind of aluminium shell and anode oxidation method thereof based on nanometer forming process, by the innovation of the anode oxidation process of NMT aluminium shell is improved, guaranteeing under the prerequisite of aluminium shell appearance quality, greatly reduce the damaging influence that anode oxidation process produces the bonding force of NMT aluminium shell, make still retaining comparatively practical bonding force through the plastic cement structure after surface treatment and metallic surface, and then be that favourable condition has been created in the universal and application of NMT aluminium shell in smart mobile phone.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
1. the aluminium shell anode oxidation method based on nanometer forming process, is characterized in that, described method comprises:
To through nanometer forming technique, process and carry out the processing of foaming of aluminium shell after in-mould injection at 90 ℃ ± 2 ℃ temperature;
Aluminium shell after foaming is processed adopts 14 ~ 20V voltage to carry out anodic oxidation 16 ~ 24min;
By sealing of hole 8 ~ 12min at 85 ~ 100 ℃ of temperature of the aluminium shell 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 sandblast before foaming is processed, and sandblast machine adopts the pressure of 2.0 ~ 2.4kg to carry out sandblast.
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 that contains 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, in carrying out washed with de-ionized water process, in deionized water, passes 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 is processed at room temperature in 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, is characterized in that, the aluminium shell of described anodic oxidation dyeed before sealing of hole, and 2.5 ~ 4.5min dyes at 45 ~ 65 ℃ of temperature.
7. the aluminium shell anode oxidation method based on nanometer forming process according to claim 1, is characterized in that, described aluminium shell is washed after sealing of hole, and at 80 ~ 100 ℃ 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 adopts concentration in processing be that 98% sulfuric acid foams, and 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 ℃ of temperature.
10. the aluminium shell based on nanometer forming process, is characterized in that, described aluminium shell is processed according to the anode oxidation method as described in claim 1-9 any one after nanometer forming technique is processed.
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