CN114481255A - Hard anodizing process for pure aluminum sand blasting surface - Google Patents
Hard anodizing process for pure aluminum sand blasting surface Download PDFInfo
- Publication number
- CN114481255A CN114481255A CN202210048709.3A CN202210048709A CN114481255A CN 114481255 A CN114481255 A CN 114481255A CN 202210048709 A CN202210048709 A CN 202210048709A CN 114481255 A CN114481255 A CN 114481255A
- Authority
- CN
- China
- Prior art keywords
- cleaning
- pure aluminum
- anodizing process
- deionized water
- sand blasting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005488 sandblasting Methods 0.000 title claims abstract description 13
- 238000007743 anodising Methods 0.000 title claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 230000003647 oxidation Effects 0.000 claims abstract description 11
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000005237 degreasing agent Methods 0.000 claims abstract description 9
- 239000013527 degreasing agent Substances 0.000 claims abstract description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005238 degreasing Methods 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005530 etching Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a hard anodizing process for a pure aluminum sand blasting surface, which is characterized in that after sand blasting is carried out on the surface of a pure aluminum material, an alkaline degreasing agent is adopted to carry out ultrasonic degreasing cleaning on the surface of the pure aluminum material, oil stains and floating particles on the surface of a product are removed, and then overflowing deionized water is used for cleaning residual degreasing agent; after degreasing and cleaning, sequentially cleaning by 3% HF and 20% HNO3 for 15-20 s; and (3) performing 20% HNO3 cleaning for 100-120s, performing 2-3min deionized water overflow cleaning after each step, and simultaneously performing deionized water spray cleaning for 2-3 min. By adopting a special pretreatment process and a sulfuric acid hard anodic oxidation process containing additives, the acid corrosion resistance of the hard anodic oxidation film is greatly improved on the premise of ensuring the uniform and consistent appearance of the film.
Description
Technical Field
The patent belongs to the field of surface treatment, and mainly relates to the technical requirements of surface treatment of hard anodic oxidation on a pure aluminum sand blasting surface.
Background
Generally, the surface of pure aluminum is blasted mainly to remove the natural oxide on the surface, and the surface roughness is increased. However, the sandblasted surface often has a color difference in appearance due to reaction difference during the oxide removal process. Meanwhile, due to the pure aluminum surface, the color of the hard anodized film layer is lighter, so that the appearance color difference is more obvious. The invention mainly aims at the problem of color difference and improves the acid corrosion resistance of the film layer on the premise of consistent appearance.
Disclosure of Invention
Aiming at the hard anodizing process of the pure aluminum sand blasting surface, the invention adopts a pretreatment mode of acid etching and a sulfuric acid hard anodizing process of an additive, and finally, a film layer with uniform appearance and excellent acid corrosion resistance is obtained.
The purpose of the invention is realized by the following technical scheme:
a hard anodizing process for a pure aluminum sand blasting surface comprises the steps of carrying out ultrasonic degreasing cleaning on a pure aluminum material surface by using an alkaline degreasing agent after sand blasting is carried out on the pure aluminum material surface, removing oil stains, floating particles and the like on the product surface, wherein the cleaning time is 10-15min, and then cleaning residual degreasing agent by using overflowing deionized water, wherein the cleaning time is 2 min; after degreasing and cleaning, respectively and sequentially cleaning 3% HF + 20% HNO3 and 20% HNO3 for 15-20s and 120s, overflowing and cleaning with deionized water for 2min after each cleaning, and simultaneously spraying water with deionized water for 2-3 min.
The technical scheme is optimized, after water spraying, the anode material is placed into a hard anodic oxidation tank, the tank liquid is 150-165g/L sulfuric acid and 3% -5% of additive, the current density is 1.5A/dm2, and the temperature of the tank liquid is 1-3 ℃;
the technical scheme is optimized, after anodic oxidation, pure water with the temperature of 95-98 ℃ is adopted for hole sealing, and the hole sealing time is 2-4 min/mu m.
The invention has the beneficial effects that:
1. the process adopts the acid etching and pickling pretreatment processes, the sand blasting surface is uniform, and the consistency and uniformity of the sand blasting surface on appearance are ensured;
2. the process adopts the sulfuric acid hard anodic oxidation process of the additive, ensures the compactness of the film layer and improves the acid corrosion resistance of the film layer;
3. the invention has simple and convenient process operation and easy batch processing.
Detailed Description
The present invention will be described in detail with reference to examples.
Example (b):
1. after sand blasting is carried out on the surface of a pure aluminum material, ultrasonic degreasing cleaning is carried out on the surface of the pure aluminum material by adopting an alkaline degreasing agent, oil stain, floating particles and the like on the surface of a product are removed, the cleaning time is 10-15min, then, overflowing deionized water is used for cleaning residual degreasing agent, and the cleaning time is 2 min.
2. After degreasing and cleaning, respectively and sequentially carrying out cleaning and water cleaning of 3% HF + 20% HNO3 and cleaning and water cleaning of 20% HNO3 for 15-20s, 2min, 120s and 2min, wherein deionized water is adopted in the water cleaning process, and finally, deionized water is adopted for water spraying and cleaning for 2-3 min.
3. After water spraying and washing, the mixture is put into a hard anodic oxidation tank for hard anodic oxidation. The bath solution is 150-165g/L sulfuric acid and 3% -5% of additive, the current density is 1.5A/dm2 in the process, and the temperature of the bath solution is 1-3 ℃.
4. After anodic oxidation, sealing holes by pure water at 95-98 ℃, wherein the hole sealing time is 2-4 min/mum.
Claims (5)
1. A hard anodizing process for a pure aluminum sand blasting surface is characterized by comprising the following steps: after sand blasting is carried out on the surface of a pure aluminum material, ultrasonic degreasing cleaning is carried out on the surface of the pure aluminum material by adopting an alkaline degreasing agent to remove oil stains and floating particles on the surface of a product, and then overflowing deionized water is used for cleaning residual degreasing agent; after degreasing and cleaning, sequentially cleaning by 3% HF and 20% HNO3 for 15-20 s; and (3) performing 20% HNO3 cleaning for 100-120s, performing 2-3min deionized water overflow cleaning after each step, and simultaneously performing deionized water spray cleaning for 2-3 min.
2. The hard anodizing process of a pure aluminum blasted surface as claimed in claim 1, wherein: after water spraying, the mixture is put into a hard anodic oxidation tank, the bath solution is 150-165g/L sulfuric acid and 3% -5% of additive, the current density is 1.5A/dm2, and the bath solution temperature is 1-3 ℃.
3. The hard anodizing process of a pure aluminum blasted surface as claimed in claim 1, wherein: after anodic oxidation, sealing holes by pure water at 95-98 ℃, wherein the hole sealing time is 2-4 min/mum.
4. The hard anodizing process of a pure aluminum blasted surface as claimed in claim 1, wherein:
the cleaning time for removing oil stains and floating particles on the surface of the pure aluminum material is 10-15 min.
5. The hard anodizing process of a pure aluminum sandblasted surface according to claim 1, wherein:
the cleaning time of the degreasing agent for removing the surface of the pure aluminum material is 2 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210048709.3A CN114481255A (en) | 2022-01-17 | 2022-01-17 | Hard anodizing process for pure aluminum sand blasting surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210048709.3A CN114481255A (en) | 2022-01-17 | 2022-01-17 | Hard anodizing process for pure aluminum sand blasting surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114481255A true CN114481255A (en) | 2022-05-13 |
Family
ID=81512604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210048709.3A Pending CN114481255A (en) | 2022-01-17 | 2022-01-17 | Hard anodizing process for pure aluminum sand blasting surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114481255A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484913A (en) * | 2013-09-16 | 2014-01-01 | 青岛聚蚨源机电有限公司 | Aluminum alloy hard anodic oxidization treating process |
| CN105970269A (en) * | 2016-05-23 | 2016-09-28 | 沈阳富创精密设备有限公司 | Sand blasting oxalic acid anode process |
| CN110607549A (en) * | 2019-08-20 | 2019-12-24 | 帝京半导体科技(苏州)有限公司 | Anti-static hard anodic oxidation process |
-
2022
- 2022-01-17 CN CN202210048709.3A patent/CN114481255A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484913A (en) * | 2013-09-16 | 2014-01-01 | 青岛聚蚨源机电有限公司 | Aluminum alloy hard anodic oxidization treating process |
| CN105970269A (en) * | 2016-05-23 | 2016-09-28 | 沈阳富创精密设备有限公司 | Sand blasting oxalic acid anode process |
| CN110607549A (en) * | 2019-08-20 | 2019-12-24 | 帝京半导体科技(苏州)有限公司 | Anti-static hard anodic oxidation process |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220513 |