CN105624761A - Perspiration resisting liquid improving technique for aluminum alloy casing - Google Patents
Perspiration resisting liquid improving technique for aluminum alloy casing Download PDFInfo
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- CN105624761A CN105624761A CN201610004354.2A CN201610004354A CN105624761A CN 105624761 A CN105624761 A CN 105624761A CN 201610004354 A CN201610004354 A CN 201610004354A CN 105624761 A CN105624761 A CN 105624761A
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- sealing
- aluminum alloy
- hole
- alloy casing
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/243—Chemical after-treatment using organic dyestuffs
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention relates to a perspiration resisting liquid improving technique for an aluminum alloy casing. The technique comprises the following steps of providing materials: providing the aluminum alloy casing; performing anodic oxidation: performing anodic oxidation on the casing so as to form an oxidation layer with holes on the surface of the casing; dyeing: filling dyes in the holes of the oxidation layer; primarily sealing the holes: performing composite hole sealing on the casing dyed by using villiaumite and organic nickel so as form a deposition layer on the surfaces of the dyes; secondarily sealing the holes: using fluozirconate to perform chromate-free passivation on the casing subjected to the primary hole sealing so as to form a fluorine-containing passivation layer on the surface of the deposition layer; and sealing hole for the third time: using weak organic alkali to perform hole sealing and aging on the casing subjected to secondary hole sealing so as to form an ageing layer on the surface of the fluorine-containing passivation layer. The perspiration resisting liquid improving technique for the aluminum alloy casing, provided by the invention, the aluminum alloy casing, in particular to a colored aluminum alloy casing, does not easily age or fade, and meets test requirements of UV (Ultraviolet) and the perspiration resisting liquid.
Description
[technical field]
The present invention relates to a kind of aluminum alloy casing field of surface treatment, the resistance to perspiration particularly relating to a kind of aluminum alloy casing improves technique.
[background technology]
In present smart machine, aluminum alloy casing is because of its good physical property and appearance attractive in appearance so that its application is more and more extensive. But, so that the color of shell of smart machine more liking by consumer, it is necessary on shell, plate various beautiful color.
But existing this aluminum alloy casing, especially the colored aluminum shell on mobile phone it is applied in, often carry out anodized, in order to coordinate anodized, dyestuff is typically all metal-organic complex, by UV aging tester, product surface is carried out long ultraviolet illumination, the ultra-violet resistance energy of test product, it is metal-organic complex owing to being applied to the dyestuff major part of anode oxidation coloration, easily decompose aging under long ultraviolet radiation, fade, mobile phone shell processing procedure UV ageing test result is all difficult to meet reliability testing demand in the industry at present.
Therefore, it is necessary to provide the resistance to perspiration of a kind of novel aluminum alloy casing to improve technique.
[summary of the invention]
It is an object of the invention to provide the resistance to perspiration of a kind of aluminum alloy casing and improve technique, it easily decomposes technical problem aging, that fade for solving current colored aluminum shell under long ultraviolet radiation.
In order to solve above-mentioned technical problem, the invention provides the resistance to perspiration of a kind of aluminum alloy casing and improve technique, this technique comprises the steps: feed, it is provided that aluminum alloy casing; Anodic oxidation, carries out anodic oxidation to this shell, to form one layer of pertusate oxide layer of band in this case surface; Dyeing, fills dyestuff in the hole of this oxide layer; One sealing of hole, uses villiaumite and organic nickel that the shell after dyeing is carried out compound hole sealing, to form deposition layer on this dyestuff surface; Two road sealing of holes, use fluozirconate that the shell after having carried out one sealing of hole is carried out chromium-free deactivation, to form fluorine-containing passivation layer at described heavy build-up surface; Three road sealing of holes, use alkalescence organic base that the shell through two road sealing of holes is carried out sealing of hole ageing, to form seasoning layer in described fluorine-containing passivation layer surface.
Preferably, reduction voltage, reduction tank liquor concentration, temperature and prolongation oxidization time is adopted to promote the consistency of described oxide layer.
Preferably, the aperture of described oxide layer Hole is 10��16nm.
Preferably, described dyestuff is metal-organic complex.
Preferably, in one sealing of hole step, described organic nickel is organic nickel salt.
Preferably, in one sealing of hole step, employing concentration is 3��8g/L, PH be 4.0��7.0 villiaumite and organic nickel salt pair described in shell carry out sealing of hole 200��300s.
Preferably, in two road sealing of hole steps, employing concentration is 40��100ml/L, PH is the fluozirconate of 5.0��6.0, in room temperature, described shell is carried out sealing of hole 600��1200s.
Preferably, in three road sealing of hole steps, employing concentration is 80��150ml/L, PH be 11.0��13.0 alkalescence organic base, in 95 DEG C, described shell is carried out sealing of hole 1200��2400s.
The beneficial effects of the present invention is: the resistance to perspiration of aluminum alloy casing provided by the invention improves technique, and it makes aluminum alloy casing, especially colored aluminum alloy casing not easily weather stain, meet that UV is aging and the test request of resistance to perspiration.
[accompanying drawing explanation]
Fig. 1 is the schematic perspective view of aluminum alloy casing of the present invention;
Fig. 2 is the anodization step schematic diagram that the resistance to perspiration of aluminum alloy casing of the present invention improves technique;
Fig. 3 is the staining procedure schematic diagram that the resistance to perspiration of aluminum alloy casing of the present invention improves technique;
Fig. 4 is one sealing of hole step schematic diagram that the resistance to perspiration of aluminum alloy casing of the present invention improves technique;
Fig. 5 is the two road sealing of hole step schematic diagrams that the resistance to perspiration of aluminum alloy casing of the present invention improves technique;
Fig. 6 is the three road sealing of hole step schematic diagrams that the resistance to perspiration of aluminum alloy casing of the present invention improves technique.
[detailed description of the invention]
Below in conjunction with drawings and embodiments, the present invention is described in further detail. Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
The invention provides the resistance to perspiration of a kind of aluminum alloy casing and improve technique, this aluminum alloy casing is mainly used in the bonnet of the portable electric appts such as mobile phone, iPAD, and cell phone rear cover 10 as shown in Figure 1, this technique comprises the steps:
S1, feed, it is provided that aluminum alloy casing 10.
S2, anodic oxidation, carry out anodic oxidation to this shell 10, to form one layer of oxide layer 11 with hole 110 in this case surface, as shown in Figure 2. It is 210��230g/L, Al by above-mentioned aluminum alloy casing 10 in sulphuric acid solubility3+For oxidation 800��2200s in the anolyte of��15g/L, and oxidizing temperature controls at 18��19 DEG C. Thus form oxide layer 11 on aluminum alloy casing 10 surface, forming a plurality of hole 110 in described oxide layer 11, the aperture of described hole is 10��16nm. Preferably, reduction voltage, reduction tank liquor concentration, temperature and prolongation oxidization time is adopted to promote the consistency of described oxide layer so that the hole in anodic oxide coating is reduced to 8 present��20nm by common 12��30nm.
S3, dyeing, fill dyestuff 12, as shown in Figure 3 in the hole 110 of this oxide layer 11. Described dyestuff 12 is metal-organic complex. To be placed in metal complex solubility to be 1��5g/L, PH be through anodised aluminum alloy casing 10 in the dyestuff groove of 6.0��7.0, dye under room temperature 300��600s.
S4, one sealing of hole, use villiaumite and organic nickel that the shell 10 after dyeing is carried out compound hole sealing, to form deposition layer 13 on this dyestuff 12 surface, as shown in Figure 4. Described organic nickel preferably adopts organic nickel salt in the present embodiment. In this step, being actually placed in the sealing of hole groove accommodating hole sealing agent and carry out sealing of hole by the aluminum alloy casing 10 after dyeing, described hole sealing agent includes Nickel difluoride and other auxiliary agent etc. Employing concentration is 3��8g/L, PH is the villiaumite of 4.0��7.0 and organic nickel salt hole sealing agent, in described sealing of hole groove, and room temperature, described aluminum alloy casing after dyeing is carried out one sealing of hole 200��300s.
S5, two road sealing of holes, use fluozirconate that the shell 10 after having carried out one sealing of hole is carried out chromium-free deactivation, to form fluorine-containing passivation layer 14 on described deposition layer 13 surface, as shown in Figure 5. Described hole sealing agent includes fluozirconate and other auxiliary agent etc. Employing concentration is 40��100ml/L, PH be 5.0��6.0 fluozirconate hole sealing agent, in sealing of hole groove, room temperature, to described through dyeing after aluminum alloy casing carry out two road sealing of hole 600��1200s.
S6, three road sealing of holes, use alkalescence organic base that the shell 10 through two road sealing of holes is carried out sealing of hole ageing, to form seasoning layer 15 on described fluorine-containing passivation layer 14 surface, as shown in Figure 6. Described hole sealing agent includes alkalescence organic base and other auxiliary agent etc., and this alkalescence organic base selects according to actual needs. Preferably, employing concentration is 80��150ml/L, PH be 11.0��13.0 alkalescence organic base hole sealing agent, in sealing of hole groove, 95 DEG C, to described through dyeing after aluminum alloy casing carry out three road sealing of hole 1200��2400s.
Existing organic nickel salt sealing of hole deposition Ni (OH)2, AL2O3��nH2O, it is impossible to the long-time irradiation of block ultraviolet, also resistance to weakly alkaline synthetic perspiration cannot corrode, need to this operation be improved. Therefore, in the present invention, first, introducing villiaumite and organic nickel compound hole sealing, fluorion promotes the hydration reaction of oxide layer, fluorion and amorphous alumina reacting generating complex, discharge hydroxide ion simultaneously, make pH value in oxide-film raise, nickel ion hydrolysis in oxide layer, generate hydroxide, with fluoro-containing alumina AL (OH)3F6Co-deposited to reach the purpose of sealing of hole; after this step completes; increase by two road sealing of holes; i.e. chromium-free deactivation operation; use fluozirconate that aluminum alloy casing 10 is processed; one layer of fluorine-containing passivation layer 14 is formed in case surface; the deposition layer 13 of one sealing of hole step is protected; after this operation completes; enter the high temperature hole sealing ageing stage of three road sealing of hole steps; this stage uses alkalescence organic base that the sealing of hole layer of product is carried out sealing of hole ageing, to form seasoning layer 15 on described fluorine-containing passivation layer 14 surface, thus reaching the sealing of hole performance of the best.
In actual process step; also needed to carry out before described aluminum alloy casing 10 is carried out anodic oxidation ultrasound wave alkalescence defat, in and except the step such as stain, chemical polishing; but these steps are all consistent with step with conventional process conditions; and it is not belonging to protection scope of the present invention, therefore do not describe in detail one by one at this.
Before the poststaining of anodization step, it is also possible to select traditional anti-acid regurgitation processing step, the anti-acid regurgitation agent namely using solubility to be 30��60g/L, PH:1.5��2.5, in room temperature, process 300��600s to through anodised aluminum alloy casing 10. Described anti-acid regurgitation agent includes organic acid or acylate etc.
At described aluminum alloy casing 10 after three road hole-sealing technology steps, it is also possible to adopt conventional process to carry out ash disposal. Namely the neutralization filth remover that solubility can be selected to be 30��70g/L, except stain 120��180s in room temperature, wherein, described neutralization filth remover can be nitric acid, ferrous sulfate etc.
Resistance to perspiration through above-mentioned aluminum alloy casing is improved the aluminum alloy casing 10 that process improving crosses and carries out UV burn-in test.
Test condition one:
UV time and temperature are 4h and 60 DEG C, and light intensity is 630uW/m2, interlunation and temperature is 4h and 50 DEG C, and total testing time is 96h. Test result is as shown in table 1:
Table 1
Test condition two:
UV time and temperature are 8h and 60 DEG C, and light intensity is 1000uW/m2, interlunation and temperature is 4h and 50 DEG C, and total testing time is 96h. Test result is as shown in table 2:
Table 2
In above-mentioned table 1 and 2, A is the aluminum alloy casing that traditional handicraft processed, and B, C, D and E are the employing resistance to perspiration of aluminum alloy casing of the present invention and improve the aluminum alloy casing that process improving is crossed. Three axles of the Lab representative products color 3D in form, L-value is the bright saturation of color, the namely depth, and numerical value is more big, and color is more shallow, and numerical value is more little, and color is more deep; A value represents the red green phase of color, and the more big color of numerical value is more partially reddish tint, more low more green phase; B value represents the champac form and aspect of color, the more partially yellow phase of the more big color of numerical value, and numerical value is more low more inclined blue phase, therefore by Lab value digitized description color. �� Lab and �� E value are aberration, i.e. color distortion value between each color, and �� E value is more big, and namely heterochromia (changing value) is more big, and �� E value is more little, and color distortion (amount of variability) is more little; �� L, �� a, �� b, respectively three color parameter amount of variability. In sum, compare based on �� Lab and �� E, it is seen that B, C, D, E sample improves significantly than A.
Resistance to perspiration through above-mentioned aluminum alloy casing is improved the aluminum alloy casing 10 that process improving crosses and carries out resistance to perspiration test.
Test condition one: synthetic perspiration's pH value is 4.0, temperature is 55 DEG C, and the time is 48h.
Test condition two: synthetic perspiration's pH value is 8.8, temperature is 55 DEG C, and the time is 48h.
Test result is as shown in table 3:
Table 3
In above-mentioned table 3, A is the aluminum alloy casing that traditional handicraft processed, and B, C, D and E are the employing resistance to perspiration of aluminum alloy casing of the present invention and improve the aluminum alloy casing that process improving is crossed. Can be seen that, rising along with perspiration pH value, the aluminum alloy casing that traditional handicraft processed can not meet the test request of resistance to perspiration, and adopts the color stability that the resistance to perspiration of aluminum alloy casing of the present invention improves the aluminum alloy casing that process improving is crossed to be significantly improved.
The resistance to perspiration of aluminum alloy casing 10 provided by the invention improves technique, and it makes aluminum alloy casing 10, especially colored aluminum alloy casing 10 not easily weather stain, meets that UV is aging and the test request of resistance to perspiration.
Above-described is only the better embodiment of the present invention, it should be noted here that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, it is also possible to make improvement, but these belong to protection scope of the present invention.
Claims (8)
1. the resistance to perspiration of an aluminum alloy casing improves technique, it is characterised in that this technique comprises the steps:
Feed, it is provided that aluminum alloy casing;
Anodic oxidation, carries out anodic oxidation to this shell, to form one layer of pertusate oxide layer of band in this case surface;
Dyeing, fills dyestuff in the hole of this oxide layer;
One sealing of hole, uses villiaumite and organic nickel that the shell after dyeing is carried out compound hole sealing, to form deposition layer on this dyestuff surface;
Two road sealing of holes, use fluozirconate that the shell after having carried out one sealing of hole is carried out chromium-free deactivation, to form fluorine-containing passivation layer at described heavy build-up surface;
Three road sealing of holes, use alkalescence organic base that the shell through two road sealing of holes is carried out sealing of hole ageing, to form seasoning layer in described fluorine-containing passivation layer surface.
2. the resistance to perspiration of aluminum alloy casing as claimed in claim 1 improves technique, it is characterised in that: adopt reduction voltage, reduction tank liquor concentration, temperature and prolongation oxidization time to promote the consistency of described oxide layer.
3. the resistance to perspiration of aluminum alloy casing as claimed in claim 1 improves technique, it is characterised in that: the aperture of described oxide layer Hole is 10��16nm.
4. the resistance to perspiration of aluminum alloy casing as claimed in claim 1 improves technique, it is characterised in that described dyestuff is metal-organic complex.
5. the resistance to perspiration of aluminum alloy casing as claimed in claim 1 improves technique, it is characterised in that: in one sealing of hole step, described organic nickel is organic nickel salt.
6. the resistance to perspiration of aluminum alloy casing as claimed in claim 1 improves technique, it is characterised in that in one sealing of hole step, employing concentration is 3��8g/L, PH be 4.0��7.0 villiaumite and organic nickel salt pair described in shell carry out sealing of hole 200��300s.
7. the resistance to perspiration of the aluminum alloy casing as described in claim 1 or 6 improves technique, it is characterized in that, in two road sealing of hole steps, employing concentration is 40��100ml/L, PH is the fluozirconate of 5.0��6.0, in room temperature, described shell is carried out sealing of hole 600��1200s.
8. the resistance to perspiration of aluminum alloy casing as claimed in claim 7 improves technique, it is characterized in that, in three road sealing of hole steps, employing concentration is 80��150ml/L, PH be 11.0��13.0 alkaline pore-sealing liquid, in 95 DEG C, described shell is carried out sealing of hole 1200��2400s.
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| CN201610004354.2A CN105624761A (en) | 2016-01-04 | 2016-01-04 | Perspiration resisting liquid improving technique for aluminum alloy casing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950638A (en) * | 2018-07-27 | 2018-12-07 | 歌尔股份有限公司 | Aluminum alloy materials and preparation method thereof |
| CN110552041A (en) * | 2019-09-16 | 2019-12-10 | 歌尔股份有限公司 | Surface treatment method for metal material |
| CN113943961A (en) * | 2020-07-16 | 2022-01-18 | 北京小米移动软件有限公司 | Metal shell, manufacturing method thereof and electronic equipment |
| CN117845306A (en) * | 2024-03-07 | 2024-04-09 | 深圳万佳原精化科技股份有限公司 | Hole sealing technology for improving alkali resistance of dyed aluminum alloy anodic oxide film |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950638A (en) * | 2018-07-27 | 2018-12-07 | 歌尔股份有限公司 | Aluminum alloy materials and preparation method thereof |
| CN110552041A (en) * | 2019-09-16 | 2019-12-10 | 歌尔股份有限公司 | Surface treatment method for metal material |
| CN110552041B (en) * | 2019-09-16 | 2021-02-19 | 歌尔股份有限公司 | Surface treatment method for metal material |
| CN113943961A (en) * | 2020-07-16 | 2022-01-18 | 北京小米移动软件有限公司 | Metal shell, manufacturing method thereof and electronic equipment |
| CN117845306A (en) * | 2024-03-07 | 2024-04-09 | 深圳万佳原精化科技股份有限公司 | Hole sealing technology for improving alkali resistance of dyed aluminum alloy anodic oxide film |
| CN117845306B (en) * | 2024-03-07 | 2024-05-17 | 深圳万佳原精化科技股份有限公司 | Hole sealing technology for improving alkali resistance of dyed aluminum alloy anodic oxide film |
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Application publication date: 20160601 |