CN114672863A - Anodic oxidation process for manufacturing mirror surface pattern on aluminum alloy surface - Google Patents
Anodic oxidation process for manufacturing mirror surface pattern on aluminum alloy surface Download PDFInfo
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- CN114672863A CN114672863A CN202111620886.6A CN202111620886A CN114672863A CN 114672863 A CN114672863 A CN 114672863A CN 202111620886 A CN202111620886 A CN 202111620886A CN 114672863 A CN114672863 A CN 114672863A
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- aluminum alloy
- anodic oxidation
- oxidation process
- pattern
- mirror
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 43
- 230000003647 oxidation Effects 0.000 title claims abstract description 39
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000005488 sandblasting Methods 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 3
- 239000008151 electrolyte solution Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000010407 anodic oxide Substances 0.000 claims description 2
- 229910052845 zircon Inorganic materials 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 238000005498 polishing Methods 0.000 abstract description 11
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C25D11/12—Anodising more than once, e.g. in different baths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
-
- 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
- C25D11/16—Pretreatment, e.g. desmutting
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- ing And Chemical Polishing (AREA)
Abstract
The invention provides an anodic oxidation process for manufacturing mirror patterns on the surface of an aluminum alloy. Mechanically polishing the surface of the aluminum alloy to obtain a mirror surface effect, pressing a light-sensitive dry film on the surface of the aluminum alloy, exposing by using a film with a manufactured pattern, developing, performing sand blasting treatment on the unmasked surface, performing a primary anodic oxidation process on the product, removing the protective dry film, and performing secondary anodic oxidation treatment. The invention is a brand new anodic oxidation process, can make perfect mirror surface effect on the surface of the aluminum alloy, and can realize various complex patterns.
Description
Technical Field
The invention relates to an anodic oxidation process for an aluminum alloy surface, in particular to an anodic oxidation process for manufacturing a mirror surface pattern on the aluminum alloy surface, wherein the pattern can be LOGO. The aluminum alloy is generally an aluminum alloy plate, such as a shell of a mobile phone, a notebook computer, a Pad, wearing equipment and vehicle-mounted equipment; or an aluminum alloy piece of other shape.
Technical Field
The aluminum alloy shell is an attractive and durable material, is widely applied to the fields of notebook computers, mobile phones, tablet computers, wearing, vehicle-mounted computers and the like, and generally has two main aspects of factors influencing the appearance effect of the mirror surface anodized aluminum plate, namely, the mirror surface is required to be close to the base material before the base material is anodized, and the porosity and the thickness of an oxide film of the anodized aluminum plate are controlled.
At present, two methods are commonly adopted for LOGO marks on metal surfaces:
the first kind shields back laser beam machining and goes out LOGO sign figure, then carries out secondary anodic oxidation, and its shortcoming is that LOGO sign district surface receives the destruction of laser, and its roughness is Ra0.1, and defects such as white spot pockmark can appear in the surface moreover, and shields membrane LOGO sign district and receive laser high temperature to destroy, can produce the sawtooth defect. The process is only applied to scenes such as surface fonts and the like with low requirements on surface effects at present.
The second is the method that present cell-phone and pen power plant businessmen generally adopted, and LOGO identification area adopts the method of inlaying, and shell and LOGO sign are processed alone, then inlay the equipment, and this kind of method can LOGO identification area obtain perfect mirror surface effect, its shortcoming: the processing procedure is long and the cost is high; increasing the thickness of the shell encroaches into the interior space of the product.
Disclosure of Invention
The invention aims to provide an anodic oxidation process for manufacturing mirror patterns on the surface of an aluminum alloy, so that more delicate mirror patterns can be manufactured on the surface of the aluminum alloy. Therefore, the invention adopts the following technical scheme:
an anodic oxidation process for manufacturing mirror patterns on the surface of an aluminum alloy is characterized by comprising the following steps:
(1) The surface of the aluminum alloy is mechanically polished to have a mirror effect;
(2) arranging a light-sensitive dry film on the surface of the aluminum alloy with the mirror surface effect;
(3) exposing by using a film with a manufactured pattern;
(4) developing to enable the photosensitive dry film corresponding to the pattern to be photosensitive to form a protective dry film, and after developing, protecting the part, corresponding to the pattern, of the surface of the aluminum alloy by the photosensitive protective dry film;
(5) then carrying out sand blasting treatment on the surface of the aluminum alloy;
(6) carrying out a primary anodic oxidation process on the aluminum alloy subjected to the sand blasting treatment;
(7) stripping off the protective dry film to expose the surface of the aluminum alloy with the mirror effect corresponding to the pattern;
(8) and carrying out secondary anodic oxidation treatment.
On the basis of the technical scheme, the invention can also adopt the following further technical schemes or combine the further technical schemes for use:
the roughness of the polished surface reaches Ra0.01-Ra0.04.
The light-sensitive dry film uses a dry film light resistance or light resistance printing ink, and the thickness is 30-50 mu m.
And (3) using a film for manufacturing patterns in the step (2), exposing by using contact type parallel exposure equipment, and standing for more than 4 hours after exposure.
1 to 3 percent of Na is used2CO3The solution is subjected to a development treatment.
And carrying out sand blasting treatment on the surface by using 150-mesh zircon sand or iron sand, wherein the sand blasting pressure is 0.1-0.2 Mpa, and the sand blasting time is 30-120 seconds.
Under the condition of primary anodic oxidation, the electrolytic solution is sulfuric acid, the electrolytic voltage is 12V-15V, the electrolytic time is 25-35 min, and the thickness of the anode film is 12-15 mu m.
In the step (5), an organic alkali stripping solution is used to prevent the stripping solution from corroding points on the surface of the aluminum alloy.
The secondary anodic oxidation voltage is 6-10V, the electrolysis time is adjusted according to the thickness requirement, and the anodic oxide film is controlled to be less than 10 micrometers.
The invention has the following effects: can overcome the shortcoming among the prior art, under the condition of making aluminum alloy mechanical polishing mirror surface earlier, through shielding LOGO district, remain the mirror surface effect behind the mechanical polishing, the anodic oxidation is distinguished apart to LOGO district and non-LOGO, and the effect of mechanical polishing Ra0.02 can be remained to LOGO sign area roughness. The LOGO mark area is manufactured by using an exposure and development process, the exposure and development resolution can reach 10 mu m, and the LOGO mark edge is very smooth. In addition, the LOGO identification region is shielded, and after other surfaces of the shell are machined, the LOGO identification region is subjected to anodic oxidation, so that damage of other processes to the LOGO identification region is avoided.
Drawings
Fig. 1 is a schematic diagram illustrating the anodic oxidation process of the present invention, taking a mobile phone cover as an example.
Detailed Description
The present invention will be described in further detail below in order to enable those skilled in the art to better understand the technical solution of the present invention.
Referring to fig. 1, the following describes in detail an anodic oxidation process for manufacturing a mirror pattern on an aluminum alloy surface, taking a LOGO with a mirror effect on a mobile phone cover as an example, and the specific implementation manner is as follows:
s1: polishing the outer surface of the aluminum alloy mobile phone cover by using a mechanical polishing machine, wherein the polishing comprises rough polishing, middle polishing and fine polishing, and the surface roughness reaches Ra0.01-Ra0.04;
s2: covering a film: the masking film uses dry film photoresistor with thickness of 30-50 μm, and is laminated by a dry film pressing machine, and the surface of the masking film is free from wrinkles and bubbles after film lamination.
S3: exposing by using a film with a manufactured pattern to enable the part corresponding to the pattern to be sensitized into a protective dry film, wherein the contact exposure requires that a light source of an exposure machine is parallel light, the power of an exposure lamp is more than 5KW, and the next procedure is carried out after standing for 4 hours after exposure;
s4: and (3) developing: 1 to 3 percent of Na is used2CO3Developing with solution to remove unexposed dry film photoresist to develop LOGO shape protected by the protected dry film
S5: sand blasting: carrying out sand blasting treatment on the outer surface of the aluminum alloy mobile phone cover by using 150-mesh zirconium sand or iron sand, wherein the sand blasting pressure is 0.1-0.2 Mpa, and the sand blasting time is 30-120 seconds;
S6: primary anodic oxidation: the solution that can not use the hydroxyl ion washs, and the outer sensitization of LOGO back protection dry film can be destroyed by the solution of hydroxyl ion, and anodic oxidation electrolytic solution is sulphuric acid, and electrolytic voltage 12V ~ 15V, electrolysis time 25 ~ 35min, and the membrane thickness of positive pole 12 ~ 15 mu m, and the electrolysis is accomplished and can be carried out dyeing according to the demand.
S7: stripping the film: and an organic alkali stripping liquid is used, so that the phenomenon that the stripping liquid corrodes points on the surface of the aluminum alloy to cause surface defects of the LOGO area is avoided. The cleaning process cannot be performed with hot water at more than 70 ℃.
S8: secondary anodic oxidation: and (3) carrying out anodic oxidation treatment on the LOGO mirror surface area after membrane stripping during secondary anodic oxidation, wherein the anodic oxidation voltage is 6-10V, the electrolysis time is adjusted according to the thickness requirement, and the anodic oxidation membrane is controlled to be below 10 micrometers.
After the product is manufactured, the roughness of the LOGO mark area can keep the effect of mechanical polishing Ra0.02. LOGO edges are very smooth.
The above embodiment is merely a preferred embodiment of the present invention, and those skilled in the art will understand that modifications or substitutions of technical solutions or parameters in the embodiment can be made without departing from the principle and essence of the present invention, and all of them shall be covered by the protection scope of the present invention.
Claims (9)
1. An anodic oxidation process for manufacturing mirror patterns on the surface of an aluminum alloy is characterized by comprising the following steps:
(1) the surface of the aluminum alloy is mechanically polished to have a mirror effect;
(2) arranging a light-sensitive dry film on the surface of the aluminum alloy with the mirror surface effect;
(3) exposing by using a film with a manufactured pattern;
(4) developing to enable the photosensitive dry film corresponding to the pattern to be photosensitive to form a protective dry film, and after developing, protecting the part, corresponding to the pattern, of the surface of the aluminum alloy by the photosensitive protective dry film;
(5) then carrying out sand blasting treatment on the surface of the aluminum alloy;
(6) carrying out a primary anodic oxidation process on the aluminum alloy subjected to the sand blasting treatment;
(7) stripping off the protective dry film to expose the surface of the aluminum alloy with the mirror effect corresponding to the pattern;
(8) and carrying out secondary anodic oxidation treatment.
2. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: the roughness of the polished surface reaches Ra0.01-Ra0.04.
3. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: the light-sensitive dry film uses a dry film light resistance or light resistance printing ink, and the thickness is 30-50 mu m.
4. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: and (3) using a film for manufacturing patterns in the step (2), exposing by using contact type parallel exposure equipment, and standing for more than 4 hours after exposure.
5. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: 1 to 3% of Na is used2CO3The solution is subjected to a development treatment.
6. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: and carrying out sand blasting treatment on the surface by using 150-mesh zircon sand or iron sand, wherein the sand blasting pressure is 0.1-0.2 Mpa, and the sand blasting time is 30-120 seconds.
7. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: under the condition of primary anodic oxidation, the electrolytic solution is sulfuric acid, the electrolytic voltage is 12V-15V, the electrolytic time is 25-35 min, and the thickness of the anode film is 12-15 mu m.
8. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: in the step (5), an organic alkali stripping solution is used to prevent the stripping solution from corroding points on the surface of the aluminum alloy.
9. The anodic oxidation process for making a mirror surface pattern on the surface of an aluminum alloy according to claim 1, wherein: the secondary anodic oxidation voltage is 6-10V, the electrolysis time is adjusted according to the thickness requirement, and the anodic oxide film is controlled to be less than 10 micrometers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111620886.6A CN114672863A (en) | 2021-12-28 | 2021-12-28 | Anodic oxidation process for manufacturing mirror surface pattern on aluminum alloy surface |
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| CN202111620886.6A CN114672863A (en) | 2021-12-28 | 2021-12-28 | Anodic oxidation process for manufacturing mirror surface pattern on aluminum alloy surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117947481A (en) * | 2023-12-21 | 2024-04-30 | 建民五金科技(东莞)有限公司 | Manufacturing process of aluminum alloy finished product with mirror surface pattern |
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| CN105926017A (en) * | 2016-05-19 | 2016-09-07 | 深圳天珑无线科技有限公司 | Treatment method of aluminum alloy surface textures and aluminum alloy product thereof |
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| CN107059014A (en) * | 2017-05-11 | 2017-08-18 | 深圳市信利特金属有限公司 | Aluminum alloy surface synthesizes smooth surface and the technique of cloudy surface pattern |
| CN108130578A (en) * | 2017-12-07 | 2018-06-08 | 研精舍(上海)精密机械加工有限公司 | Metallic mirror surface LOGO manufacture crafts |
| US20180310425A1 (en) * | 2015-12-30 | 2018-10-25 | Byd Company Limited | Aluminum alloy housing and preparation method therefor |
| CN113089045A (en) * | 2021-03-29 | 2021-07-09 | 北京小米移动软件有限公司 | Dyeing method, shell and terminal equipment |
-
2021
- 2021-12-28 CN CN202111620886.6A patent/CN114672863A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09297320A (en) * | 1996-05-02 | 1997-11-18 | Casio Comput Co Ltd | Production of liquid crystal display device |
| KR20030077482A (en) * | 2003-07-26 | 2003-10-01 | (주)그레인 | A Method of surface design using a metallic internal structure and there for products |
| CN102014577A (en) * | 2010-11-24 | 2011-04-13 | 深南电路有限公司 | Process for manufacturing local gold-plated board |
| CN102654782A (en) * | 2011-03-04 | 2012-09-05 | 汉达精密电子(昆山)有限公司 | Manufacturing method of computer shell |
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| CN105926017A (en) * | 2016-05-19 | 2016-09-07 | 深圳天珑无线科技有限公司 | Treatment method of aluminum alloy surface textures and aluminum alloy product thereof |
| CN106947993A (en) * | 2017-03-27 | 2017-07-14 | 东莞智富五金制品有限公司 | A kind of noninductive light anodic process |
| CN107059014A (en) * | 2017-05-11 | 2017-08-18 | 深圳市信利特金属有限公司 | Aluminum alloy surface synthesizes smooth surface and the technique of cloudy surface pattern |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117947481A (en) * | 2023-12-21 | 2024-04-30 | 建民五金科技(东莞)有限公司 | Manufacturing process of aluminum alloy finished product with mirror surface pattern |
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Application publication date: 20220628 |