CN105525326A - Preparation method for aluminum alloy shell and aluminum alloy shell - Google Patents
Preparation method for aluminum alloy shell and aluminum alloy shell Download PDFInfo
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- CN105525326A CN105525326A CN201410804354.1A CN201410804354A CN105525326A CN 105525326 A CN105525326 A CN 105525326A CN 201410804354 A CN201410804354 A CN 201410804354A CN 105525326 A CN105525326 A CN 105525326A
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Abstract
In order to overcome the problem that an aluminum alloy shell obtained by a method in the prior art is low in surface brightness, the invention provides a preparation method for the aluminum alloy shell. The preparation method comprises the following steps: S1, carrying out sand blasting treatment, wherein pressure intensity for sand blasting treatment is 0.18-0.25MPa, and the grain size of sand aggregates is 80-205 meshes; S2, carrying out chemical polishing treatment: at a temperature of 90-100 DEG C, adopting a polishing solution to polish for 15-20 seconds; S3, carrying out anodic oxidation treatment: carrying out the anodic oxidation treatment in an anodic oxidation electrolyte comprising 180-200g/L sulfuric acid at a temperature of 18-20 DEG C under a voltage of 13-16V, thereby obtaining an anode oxidation film with a thickness of 10-20 mu m; and S4: carrying out polishing treatment on the surface of the anodic oxidation film. The invention further discloses the aluminum alloy shell prepared by the method. The aluminum alloy shell prepared by the method is high in surface brightness, has various decorative effects, and is good in appearance quality.
Description
Technical field
The present invention relates to a kind of preparation method of metal shell, especially the Al-alloy casing for preparing of the preparation method of Al-alloy casing and the method.
Background technology
At present, the use of each electronic product is more and more universal.Wherein, electronic product casing adopts aluminum alloy material usually.For meeting the demand of electronic product casing exterior decorative effect, the research for Al-alloy casing appearance performance is more and more extensive.
For reaching good appearance effect, in prior art, adopting the surface brightness improving Al-alloy casing with the following method: 1, mechanical polishing is carried out on aluminum alloy base material surface, then carrying out paraffin removal, changing throwing, neutralization, anodic oxidation, dyeing and sealing of hole; 2, buffing is carried out to aluminum alloy base material surface, more chemical pre-treatment (paraffin removal, change are thrown, neutralized), then anodic oxidation and dyeing sealing of hole are carried out to the product with this high finish surface, finally carry out buffing again.
But aforesaid method exists following shortcoming: 1, in the process of mechanical polishing, inevitably produce macroscopic cut on aluminum alloy base material surface.After carrying out anodic oxidation on this basis, above-mentioned cut is still obviously visible, has a strong impact on the outward appearance of the Al-alloy casing obtained; 2, aluminum alloy base material surface is after polished finish, and can remain a large amount of wax, above-mentioned wax is difficult to remove completely, produces and has a strong impact on, cause the exterior quality of the Al-alloy casing obtained poor to follow-up anodic oxidation treatment; 3, in process in chemical rightenning of the aluminum alloy base material of polishing, can there is glass mark in its surface, cause luminance brightness obviously to decline within the extremely short time.
Summary of the invention
Technical problem to be solved by this invention is the problem that the Al-alloy casing surface brightness for preparing for method of the prior art is low, provides a kind of Al-alloy casing and preparation method thereof.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
A kind of preparation method of Al-alloy casing is provided, comprises the steps:
S1, sandblasting is carried out to aluminum alloy base material surface; The pressure of described sandblasting is 0.18-0.25MPa, and sand material particle diameter is 80-205 order;
S2, chemical rightenning process is carried out to the aluminum alloy base material surface through sandblasting; Described chemical rightenning treatment process is: at 90-100 DEG C, adopts polishing fluid polishing 15-20s;
S3, anodic oxidation treatment is carried out to the aluminum alloy base material surface through chemical rightenning process; Described anode oxidative treatment method is: 18-20 DEG C, under voltage is the condition of 13-16V, in the anodic oxidation electrolyte comprising 180-200g/L sulfuric acid, carries out anodic oxidation treatment, obtain the anode oxide film that thickness is 10-20 μm;
Polished finish is carried out on S4, antianode oxide film surface.
Meanwhile, present invention also offers the Al-alloy casing prepared by aforesaid method.
There is not cut, the bad phenomenon such as heterochromatic in the anode oxide film surface of the Al-alloy casing that method provided by the invention prepares.And visible sandblasting effect below transparent anode oxide film, the anode oxide film on upper strata can manifest good color effect after dyeing.
Especially the surface brightness of this Al-alloy casing is high, reaches 100-110, gives the exterior quality of Al-alloy casing excellence.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The preparation method of Al-alloy casing provided by the invention comprises the steps:
S1, sandblasting is carried out to aluminum alloy base material surface; The pressure of described sandblasting is 0.18-0.25MPa, and sand material particle diameter is 80-205 order;
S2, chemical rightenning process is carried out to the aluminum alloy base material surface through sandblasting; Described chemical rightenning treatment process is: at 90-100 DEG C, adopts polishing fluid polishing 15-20s;
S3, anodic oxidation treatment is carried out to the aluminum alloy base material surface through chemical rightenning process; Described anode oxidative treatment method is: 18-20 DEG C, under voltage is the condition of 13-16V, in the anodic oxidation electrolyte comprising 180-200g/L sulfuric acid, carries out anodic oxidation treatment, obtain the anode oxide film that thickness is 10-20 μm;
Polished finish is carried out on S4, antianode oxide film surface.
The aluminum alloy base material adopted in the present invention is aluminium alloy extrusions conventional in prior art, usually by founding and extrusion molding.As known to those skilled in the art, the shaping aluminum alloy surface obtained all has texture.When for production example as electronic product casing time, above-mentioned texture produces larger negative impact to the outward appearance of housing, usually, needs to process the shaping aluminum alloy surface obtained.What usually adopt in prior art is the mode of mechanical polishing.As previously mentioned, the Al-alloy casing appearance property (especially luminance brightness) obtained is made after mechanical polishing poor.
In the present invention, for aluminum alloy base material, first carry out sandblasting.On the one hand, the texture of aluminum alloy surface can be removed, on the other hand, sandblasting effect can be formed on aluminum alloy base material surface, be beneficial to the outward appearance variation realizing Al-alloy casing.
For realizing the high brightness of Al alloy shell surface, when sandblasting is carried out to aluminum alloy base material, strictly need control the particle diameter of the pressure of sandblasting and sand material.Found by great many of experiments, the pressure of described sandblasting is 0.18-0.25MPa, and sand material particle diameter is 80-205 order.Carry out sandblasting according to excessive blasting pressure and excessive sand material particle diameter, the luminance brightness of the Al alloy shell surface causing obtaining is declined greatly.Otherwise too small pressure and particle diameter effectively cannot form sandblasting effect on aluminum alloy base material surface, especially in the process such as subsequent chemistry polishing, very easily cause sandblasting effect to weaken further, affect the appearance property of Al-alloy casing.
According to the present invention, under preferable case, in described step S1, during sandblasting, the distance on spray gun and aluminum alloy base material surface is 15-35cm, and speed of feed is 0.5-1.5m/min.
After above-mentioned sandblasting; usually dirt can be there is in aluminum alloy base material surface; for avoiding above-mentioned residual dirt, subsequent processes is had an impact; in the present invention; under preferable case, after described step S1, before S2, also comprise the aluminum alloy base material surface after to sandblasting carry out clean.
The method of the clean aluminum alloy base material that above-mentioned clean can adopt this area to commonly use, such as, can adopt the method for neutralizing treatment after first alkali cleaning process.In the present invention, for ensureing to form effective sandblasting effect on aluminum alloy base material surface, cleaning step is avoided above-mentioned sandblasting effect to be weakened, the condition of alkali cleaning and neutralizing treatment needs strict control, concrete, described clean comprises: first by aluminum alloy base material at 55-65 DEG C, be less than alkali cleaning process 10-20s in the sodium hydroxide solution of 60g/L in concentration; Then at 22-26 DEG C, neutralizing treatment 20-30s in the salpeter solution that concentration is 20-30ml/L.
After clean, according to the present invention, for realizing the high brightness of Al alloy shell surface further, as step S2, chemical rightenning process need be carried out to aluminum alloy base material surface.Chemical rightenning is the surface treatment method that this area is commonly used, and by corroding aluminum alloy base material surface, makes its surfacing, light.But, as previously mentioned, on aluminum alloy base material surface through sandblasting, and when need retain effective sandblasting effect, need the strict condition controlling chemical rightenning process, in order to avoid weaken sandblasting effect.In the present invention, under preceding method and condition, described chemical rightenning treatment process is: at 90-100 DEG C, adopts polishing fluid polishing 15-20s;
For the polishing fluid adopted during above-mentioned polished finish, the polishing fluid for carrying out chemical rightenning to aluminum alloy base material surface conventional in prior art can be adopted, such as, in described step S2, described polishing fluid is phosphoric acid and sulfuric acid mass ratio is the mixed polishing solution of 3:1.
Concrete, in above-mentioned polishing fluid, the concentration of phosphoric acid is 700-800ml/L, and the concentration of sulfuric acid is 200-300ml/L.
In the present invention, by " ash " that the aluminum alloy base material surface meeting chemical residue polishing more or less after above-mentioned chemical rightenning process produces, for avoiding above-mentioned residual " ash ", follow-up anodic oxidation treatment step is had an impact, under preferable case, after described step S2, before S3, also comprise the aluminum alloy base material surface after to chemical rightenning process carry out clean again.By above-mentioned clean again, above-mentioned residual " ash " is removed.
Simultaneously, for above-mentioned clean again, weaken impact, under preferable case for avoiding producing aforesaid sandblasting effect, described clean again comprises: by aluminum alloy base material at 24-26 DEG C, neutralizing treatment 10-20s in the salpeter solution that concentration is 20-30ml/L.
After aforementioned processing, described by step S3, anodic oxidation treatment need be carried out to aluminum alloy base material surface, thus son aluminum alloy base material surface forms anode oxide film.
As previously mentioned, the present invention need prepare the high Al-alloy casing of surface brightness, and Al alloy shell surface is transparent anode oxide film.For ensureing that the anode oxide film prepared is the water white transparency rete of high brightness, anode oxide film is avoided to produce color and hide sandblasting effect, in the present invention, the condition of anodic oxidation treatment needs strict control, concrete, described anode oxidative treatment method is: 18-20 DEG C, under voltage is the condition of 13-16V, in the anodic oxidation electrolyte comprising 180-200g/L sulfuric acid, carry out anodic oxidation treatment, obtain the anode oxide film that thickness is 10-20 μm.Found by great many of experiments, the anode oxide film formed by aforesaid method has higher luminance brightness, simultaneously the water white transparency of anode oxide film own.
According to the present invention, under preferable case, in described step S3, the described anodic oxidation treatment time is 10-40min.
In the present invention, according to actual needs, the anode oxide film that step S3 is formed can be dyeed and sealing pores, thus give anode oxide film abundanter appearance effect.Above-mentioned dyeing and sealing pores are the method that this area is commonly used, such as, aluminum alloy base material surface with anode oxide film is immersed in that temperature is 20-80 DEG C, pH value is 4.5-5.5 containing 1-30min in the solution of dyestuff, makes the hole absorbing dye in anode oxide film and catches shades of colour.The dyestuff adopted in above-mentioned dyeing process is conventional various in this area, such as can adopt dye type be 419 dyestuff.The concentration of dyestuff can be 10g/L.
Then the aluminum alloy base material after dyeing is soaked in that pH value is 4.5-5.5, temperature is that in the nickel salt solution of 80-85 DEG C, 10-20min carries out sealing pores.
According to the present invention, as step S4, antianode oxide film is also needed to carry out polished finish.Above-mentioned polished finish can adopt existing polishing machine antianode oxide film to carry out mechanical polishing, and polishing machine specifically can with rotating buffing machine etc.
When using cloth wheel antianode oxide film surface to carry out polishing, under preferable case, use abrasive to carry out polishing, abrasive main component is Al
2o
3, abrasive particles size is generally 30-80 μm, and the cloth density wherein used in cloth wheel is 220-290g/m
3, cloth wheel external diameter is 350-550mm, and during polishing, wire velocity control is at 21-31m/s, and speed of feed controls at 2.5-4.5m/min.
There is sandblasting effect, the Al-alloy casing that surface brightness is high by internal layer can be obtained after above-mentioned process.
According to the present invention, the surface brightness of above-mentioned Al-alloy casing can reach 100-110.Exterior quality is high.
By the following examples the present invention is further detailed.
Embodiment 1
The present embodiment is for illustration of Al-alloy casing disclosed by the invention and preparation method thereof.
Adopt particle diameter to be 180 object sand material, carry out sandblasting to aluminum alloy base material surface under pressure of 0.20 mpa, the distance on spray gun and aluminum alloy base material surface is 15cm, and speed of feed is 1m/min.
Then by aluminum alloy base material alkaline etching 20s in the sodium hydroxide solution of the 50g/L of 55 DEG C.Again at 25 DEG C, neutralizing treatment 30s in the salpeter solution that concentration is 20ml/L.
The phosphoric acid and the sulfuric acid mass ratio that recycle 100 DEG C are that the mixed polishing solution of 3:1 is to aluminum alloy base material chemical rightenning 15s.
Then by aluminum alloy base material at 25 DEG C DEG C, neutralizing treatment 20s in the salpeter solution that concentration is 20ml/L.
To through chemical rightenning process aluminum alloy base material 18 DEG C, under voltage is the condition of 14V, in the anodic oxidation electrolyte comprising 180g/L sulfuric acid, anodic oxidation treatment 10min, obtains the anode oxide film that thickness is 10 μm.
Adopt washed with de-ionized water anode oxide film surface, the aluminum alloy base material then surface with anode oxide film is immersed in the solution (dye type: 419 containing dyestuff that temperature is 60 DEG C, pH value is 5, dye strength: 10g/L) in 6min dye, then the aluminum alloy base material after dyeing is soaked in that pH value is 5, temperature is that in the nickel salt solution of 80 DEG C, 20min carries out sealing pores.
Last antianode oxide film carries out mechanical polishing, obtains Al-alloy casing.
The luminance brightness of being tested Al alloy shell surface by glossometer is 102.
Embodiment 2
The present embodiment is for illustration of Al-alloy casing disclosed by the invention and preparation method thereof.
Adopt particle diameter to be 205 object sand material, carry out sandblasting to aluminum alloy base material surface under pressure of 0.20 mpa, the distance on spray gun and aluminum alloy base material surface is 35cm, and speed of feed is 1m/min.
Then by aluminum alloy base material alkaline etching 10s in the sodium hydroxide solution of the 58g/L of 55 DEG C.Again at 25 DEG C, neutralizing treatment 20s in the salpeter solution that concentration is 30ml/L.
The phosphoric acid and the sulfuric acid mass ratio that recycle 95 DEG C are that the mixed polishing solution of 3:1 is to aluminum alloy base material chemical rightenning 20s.
Then by aluminum alloy base material at 25 DEG C, neutralizing treatment 10s in the salpeter solution that concentration is 30ml/L.
To through chemical rightenning process aluminum alloy base material 19 DEG C, under voltage is the condition of 15V, in the anodic oxidation electrolyte comprising 190g/L sulfuric acid, anodic oxidation treatment 40min, obtains the anode oxide film that thickness is 20 μm.
Adopt washed with de-ionized water anode oxide film surface, the aluminum alloy base material then surface with anode oxide film is immersed in the solution (dye type: 419 containing dyestuff that temperature is 80 DEG C, pH value is 4.5, dye strength: 10g/L) in 3min dye, then the aluminum alloy base material after dyeing is soaked in that pH value is 5, temperature is that in the nickel salt solution of 80 DEG C, 20min carries out sealing pores.
Last antianode oxide film carries out mechanical polishing, obtains Al-alloy casing.
The luminance brightness of being tested Al alloy shell surface by glossometer is 110.
Embodiment 3
The present embodiment is for illustration of Al-alloy casing disclosed by the invention and preparation method thereof.
Adopt particle diameter to be 80 object sand material, under 0.25MPa pressure, carry out sandblasting to aluminum alloy base material surface, the distance on spray gun and aluminum alloy base material surface is 20cm, and speed of feed is 1.5m/min.
Then by aluminum alloy base material alkaline etching 16s in the sodium hydroxide solution of the 55g/L of 55 DEG C.Again at 25 DEG C, neutralizing treatment 25s in the salpeter solution that concentration is 25ml/L.
The phosphoric acid and the sulfuric acid mass ratio that recycle 95 DEG C are that the mixed polishing solution of 3:1 is to aluminum alloy base material chemical rightenning 16s.
Then by aluminum alloy base material at 25 DEG C, neutralizing treatment 15s in the salpeter solution that concentration is 25ml/L.
To through chemical rightenning process aluminum alloy base material 19 DEG C, under voltage is the condition of 14V, in the anodic oxidation electrolyte of 200g/L sulfuric acid, anodic oxidation treatment 30min, obtains the anode oxide film that thickness is 15 μm.
Adopt washed with de-ionized water anode oxide film surface, the aluminum alloy base material then surface with anode oxide film is immersed in the solution (dye type: 419 containing dyestuff that temperature is 20 DEG C, pH value is 5.5, dye strength: 10g/L) in 30min dye, then the aluminum alloy base material after dyeing is soaked in that pH value is 5.5, temperature is that in the nickel salt solution of 80 DEG C, 10min carries out sealing pores.
Last antianode oxide film carries out mechanical polishing, obtains Al-alloy casing.
The luminance brightness of being tested Al alloy shell surface by glossometer is 100.
Embodiment 4
The present embodiment is for illustration of Al-alloy casing disclosed by the invention and preparation method thereof.
Adopt particle diameter to be 205 object sand material, under 0.18MPa pressure, carry out sandblasting to aluminum alloy base material surface, the distance on spray gun and aluminum alloy base material surface is 25cm, and speed of feed is 0.5m/min.
Then by aluminum alloy base material alkaline etching 15s in the sodium hydroxide solution of the 55g/L of 55 DEG C.Again at 25 DEG C, neutralizing treatment 26s in the salpeter solution that concentration is 24ml/L.
The phosphoric acid and the sulfuric acid mass ratio that recycle 90 DEG C are that the mixed polishing solution of 3:1 is to aluminum alloy base material chemical rightenning 18s.
Then by aluminum alloy base material at 25 DEG C, neutralizing treatment 16s in the salpeter solution that concentration is 24ml/L.
To through chemical rightenning process aluminum alloy base material 20 DEG C, voltage be 15V, condition under, in the anodic oxidation electrolyte comprising 190g/L sulfuric acid, anodic oxidation treatment 35min, obtains the anode oxide film that thickness is 18 μm.
Adopt washed with de-ionized water anode oxide film surface, the aluminum alloy base material then surface with anode oxide film is immersed in the solution (dye type: 419 containing dyestuff that temperature is 50 DEG C, pH value is 5, dye strength: 10g/L) in 15min dye, then the aluminum alloy base material after dyeing is soaked in that pH value is 4.5, temperature is that in the nickel salt solution of 85 DEG C, 15min carries out sealing pores.
Last antianode oxide film carries out mechanical polishing, obtains Al-alloy casing.
The luminance brightness of being tested Al alloy shell surface by glossometer is 105.
Comparative example 1
This comparative example is used for comparative illustration Al-alloy casing disclosed by the invention and preparation method thereof.
Al-alloy casing is prepared according to the method for embodiment 1, unlike: adopt mechanical polishing to replace sandblasting, and do not carry out mechanical polishing process after anodic oxidation treatment.Obtain Al-alloy casing.
Observe Al alloy shell surface, find obvious cut, and anode oxide film irregular colour one.
The luminance brightness of being tested Al alloy shell surface by glossometer is 70.
Comparative example 2
This comparative example is used for comparative illustration Al-alloy casing disclosed by the invention and preparation method thereof.
Al-alloy casing is prepared according to the method for embodiment 1, unlike: adopt particle diameter to be 210 object sand material, under 0.3MPa pressure, sandblasting is carried out to aluminum alloy base material surface.Obtain Al-alloy casing.
The luminance brightness of being tested Al alloy shell surface by glossometer is 85.
Comparative example 3
This comparative example is used for comparative illustration Al-alloy casing disclosed by the invention and preparation method thereof.
Al-alloy casing is prepared according to the method for embodiment 1, unlike: regulate anodic oxidation condition, make anodic oxidation film thickness be 30 μm.Obtain Al-alloy casing.
Wherein, anode oxide film self produces color, blocks the sandblasting effect of internal layer.
The luminance brightness of being tested Al alloy shell surface by glossometer is 90.
Comparative example 4
This comparative example is used for comparative illustration Al-alloy casing disclosed by the invention and preparation method thereof.
Al-alloy casing is prepared according to the method for embodiment 1, unlike: regulate anodic oxidation condition, make anodic oxidation film thickness be 5 μm.Obtain Al-alloy casing.
The luminance brightness of being tested Al alloy shell surface by the luminance brightness testing method of embodiment 1 is 87.
The test result of comparative example 1 and comparative example 1 is known, and compared to method of the prior art, the luminance brightness of the Al-alloy casing that method provided by the invention prepares is high, and exterior quality is good.
The test result of comparative example 1 and comparative example 2 is known, and when carrying out sandblasting, excessive sand material particle diameter and blasting pressure can cause the luminance brightness of Al-alloy casing obviously to decline.
The test result of comparative example 1 and comparative example 3 is known, and the blocked up anode oxide film that will cause of the anode oxide film that anodic oxidation treatment is formed produces color, blocks the sandblasting effect of internal layer, affects the exterior quality of Al-alloy casing.
The test result of comparative example 1 and comparative example 4 is known, and the anodic oxidation that anodic oxidation treatment is formed is lepthymenia will cause the luminance brightness of Al-alloy casing obviously to decline.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a preparation method for Al-alloy casing, is characterized in that, comprises the steps:
S1, sandblasting is carried out to aluminum alloy base material surface; The pressure of described sandblasting is 0.18-0.25MPa, and sand material particle diameter is 80-205 order;
S2, chemical rightenning process is carried out to the aluminum alloy base material surface through sandblasting; Described chemical rightenning treatment process is: at 90-100 DEG C, adopts polishing fluid polishing 15-20s;
S3, anodic oxidation treatment is carried out to the aluminum alloy base material surface through chemical rightenning process; Described anode oxidative treatment method is: 18-20 DEG C, under voltage is the condition of 13-16V, in the anodic oxidation electrolyte comprising 180-200g/L sulfuric acid, carries out anodic oxidation treatment, obtain the anode oxide film that thickness is 10-20 μm;
Polished finish is carried out on S4, antianode oxide film surface.
2. preparation method according to claim 1, is characterized in that, in described step S1, during sandblasting, the distance on spray gun and aluminum alloy base material surface is 15-35cm, and speed of feed is 0.5-1.5m/min.
3. preparation method according to claim 1 and 2, is characterized in that, also comprises the aluminum alloy base material surface after to sandblasting and carry out clean after described step S1 before S2.
4. preparation method according to claim 3, is characterized in that, described clean comprises: first by aluminum alloy base material at 55-65 DEG C, be less than alkali cleaning process 10-20s in the sodium hydroxide solution of 60g/L in concentration; Then at 22-26 DEG C, neutralizing treatment 20-30s in the salpeter solution that concentration is 20-30ml/L.
5. preparation method according to claim 1, is characterized in that, in described step S2, described polishing fluid is phosphoric acid and sulfuric acid mass ratio is the mixed polishing solution of 3:1.
6. according to the preparation method in claim 1,2,4,5 described in any one, it is characterized in that, after described step S2, before S3, also comprise the aluminum alloy base material surface after to chemical rightenning process carry out clean again.
7. preparation method according to claim 6, is characterized in that, described clean again comprises: by aluminum alloy base material at 24-26 DEG C, neutralizing treatment 10-20s in the salpeter solution that concentration is 20-30ml/L.
8. according to the preparation method in claim 1,2,4,5,7 described in any one, it is characterized in that, in described step S3, the described anodic oxidation treatment time is 10-40min.
9. preparation method according to claim 1, is characterized in that, also comprises antianode oxide film and carry out dyeing and sealing pores after described step S3 before S4.
10. an Al-alloy casing, is characterized in that, is prepared by such as the method in claim 1-9 as described in any one.
11. Al-alloy casings according to claim 10, is characterized in that, the surface brightness of described Al-alloy casing is 100-110.
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