CN114892236A - Aluminum alloy alternating-current anodic oxidation process - Google Patents
Aluminum alloy alternating-current anodic oxidation process Download PDFInfo
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- CN114892236A CN114892236A CN202210369890.8A CN202210369890A CN114892236A CN 114892236 A CN114892236 A CN 114892236A CN 202210369890 A CN202210369890 A CN 202210369890A CN 114892236 A CN114892236 A CN 114892236A
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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
- C25D11/16—Pretreatment, e.g. desmutting
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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
- C25D11/06—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
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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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to an aluminum alloy alternating-current anodic oxidation process, and belongs to the technical field of aluminum alloy surface treatment. Sequentially carrying out S1. oil removal; s2, alkaline etching or polishing; s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing the anode plate and the cathode plate in electrolyte, wherein the voltage is 2-8V, and the current density is 1.0-5.0A/dm 2 The temperature of the electrolyte is 20-40 ℃, and the oxidation time is 10-60 min; the electrolyte comprises sulfuric acid and/or oxalic acid; s4, hole sealing; and S5, drying. The process solves the technical problem that when the existing aluminum alloy is applied to an aluminum strip/foil/wire, the oxide film is cracked in the bending process, so that the functionality is greatly reducedTo give a title.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy surface treatment, and relates to an aluminum alloy alternating-current anodic oxidation process.
Background
Aluminum alloys are widely used in daily life, and in order to expand the application range, anodic oxidation is usually performed on the surface of the aluminum alloy to enhance the appearance and functionality of the aluminum alloy. The conventional anodic oxide film basically adopts a direct current mode, and the produced anodic oxide film has the characteristics of high hardness, strong corrosion resistance, excellent insulating property and the like, but when the anodic oxide film is applied to an aluminum strip/foil/wire, the anodic oxide film is cracked in the bending process, so that the functionality is greatly reduced, and the actual requirement cannot be met.
Disclosure of Invention
In view of the above, the present invention provides an aluminum alloy ac anodizing process, which solves the technical problem that when the conventional aluminum alloy is applied to an aluminum strip/foil/wire, the oxide film is cracked during the bending process, and the functionality is greatly reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
an aluminum alloy alternating current anodic oxidation process comprises the following steps:
s1, oil removal: putting the aluminum alloy into a degreasing agent to clean grease;
s2, alkaline etching or polishing: performing alkaline etching or polishing treatment on the deoiled aluminum alloy to remove a natural oxidation film;
s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing the anode plate and the cathode plate in electrolyte, wherein the voltage is 2-8V, and the current density is 1.0-5.0A/dm 2 The temperature of the electrolyte is 20-40 ℃, and the oxidation time is 10-60 min; the electrolyte comprises sulfuric acid and/or oxalic acid;
s4, hole sealing: placing the dyed aluminum alloy in a sealing liquid for sealing treatment;
s5, drying: and (3) placing the aluminum alloy subjected to hole sealing in a drying box at 60-70 ℃ for 10-20 min.
Further, the step S3.1 of dyeing is further included between the steps S3 and S4, and the aluminum alloy after ac oxidation is immersed in a dyeing solution for 1-20min, wherein the dyeing solution contains an organic dye and/or an inorganic dye.
Further, in step S1, the oil removing agent is an acidic oil removing agent, a weakly basic oil removing agent, or an organic solvent.
Further, in step S3, the electrolyte solution further includes at least one of aluminum sulfate, magnesium chloride, and magnesium sulfate.
Furthermore, the concentration of sulfuric acid in the electrolyte is 50-250g/L, the concentration of oxalic acid is 0-30g/L, the concentration of aluminum sulfate is 0.1-2g/L, the concentration of magnesium chloride is 0.1-2g/L, and the concentration of magnesium sulfate is 0.1-1 g/L.
Further, the staining solution contains Cu 2+ 、Co 2+ 、Cd 2+ 、Ni 2+ 、Sn 2+ A metal salt solution of (a).
Further, in step S4, the sealing liquid contains nickel acetate and nickel fluoride.
The invention has the beneficial effects that:
the alternating current anodic oxidation process is convenient and fast to operate and easy to control, when the produced product is bent around a finger, the oxidation film has no phenomena of embrittlement, falling, white exposure and the like, and the corrosion resistance and the insulating property of the film are not different from those of a direct current anodic oxidation film.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the following embodiments are merely illustrative of the basic idea of the present invention, and features in the following embodiments and examples may be combined with each other without conflict.
Example 1
S1, oil removal: putting the selected aluminum alloy into an acidic degreasing agent, a weakly alkaline degreasing agent or an organic solvent to clean grease;
s2, alkaline etching or polishing: performing alkaline etching or polishing treatment on the deoiled aluminum alloy to remove a natural oxidation film;
s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing the anode plate and the cathode plate in electrolyte, wherein the concentration of sulfuric acid in the electrolyte is 180g/L, the concentration of aluminum sulfate is 1.5g/L, the concentration of magnesium chloride is 0.5g/L, the oxidation voltage is 6V, the temperature is 21 ℃, and the oxidation time is 15 min;
s4, hole sealing: placing the dyed aluminum alloy in a sealing liquid for sealing treatment; the sealing liquid contains nickel acetate and nickel fluoride; wherein Ni 2+ : 0.8-1.3 g/L; sealing at normal temperature of 25-35 deg.C for 5 min;
s5, drying: and (3) placing the aluminum alloy subjected to hole sealing in a drying box at the temperature of 60-70 ℃ for 15 min.
Comparative example 1
Comparative example 1 is different from example 1 in that direct current oxidation was used in step S3, in which the sulfuric acid concentration in the electrolyte was 180g/L, the oxidation voltage was 15V, the temperature was 18-21 deg.C, and the oxidation time was 10 min.
Example 2
S1, oil removal: putting the selected aluminum alloy into an acidic degreasing agent, a weakly alkaline degreasing agent or an organic solvent to clean grease;
s2, alkaline etching or polishing: performing alkaline etching or polishing treatment on the deoiled aluminum alloy to remove a natural oxidation film;
s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing the anode plate and the cathode plate in an electrolyte, wherein the concentration of sulfuric acid is 200g/L, the concentration of aluminum sulfate is 0.5g/L, the concentration of magnesium chloride is 0.5g/L, the oxidation voltage is 6V, the temperature is 21 ℃, and the oxidation time is 15 min;
s4, dyeing: immersing the aluminum alloy after AC oxidation in a dyeing solution containing Cu 2+ 、Co 2+ 、Cd 2+ 、Ni 2 + 、Sn 2+ The content of the ammonium ferric oxalate in the aqueous solution of ammonium ferric oxalate is 20 g/L; the temperature is 50-55 deg.C, and dyeing time is 5 min;
s5, hole sealing: placing the dyed aluminum alloy in a sealing liquid for sealing treatment; the sealing liquid contains nickel acetate and nickel fluoride; sealing at medium temperature, wherein Ni 2+ : 0.8-1.3 g/L; 60-65 deg.C for 5 min.
S6, drying: and (3) placing the aluminum alloy subjected to hole sealing in a drying box at the temperature of 60-70 ℃ for 15 min.
Comparative example 2
Comparative example 2 differs from example 2 in that: in the step S3, direct current oxidation is adopted, wherein the sulfuric acid concentration of the electrolyte is 200g/L, the oxidation voltage is 15V, the temperature is 18-21 ℃, and the oxidation time is 12 min; and normal temperature hole sealing is adopted in the step S5, and the hole sealing temperature is 20-35 ℃.
Example 3
S1, oil removal: putting the selected aluminum alloy into an acidic degreasing agent, a weakly alkaline degreasing agent or an organic solvent to clean grease;
s2, alkaline etching or polishing: performing alkaline etching or polishing treatment on the deoiled aluminum alloy to remove a natural oxidation film;
s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing an anode plate and a cathode plate in electrolyte, wherein the concentration of oxalic acid in the electrolyte is 30g/L, the concentration of aluminum sulfate is 1g/L, the concentration of magnesium chloride is 1g/L, the concentration of magnesium sulfate is 1g/L, the oxidation voltage is 5V, the temperature is 30-35 ℃, and the oxidation time is 30 min;
s4, hole sealing: placing the dyed aluminum alloy in a sealing liquid for sealing treatment; the sealing liquid contains nickel acetate and nickel fluoride; wherein Ni 2+ : 0.8-1.3 g/L; sealing at normal temperature of 25-35 deg.C for 15 min;
s5, drying: and (3) placing the aluminum alloy subjected to hole sealing in a drying box at the temperature of 60-70 ℃ for 15 min.
Comparative example 3
Comparative example 3 differs from example 3 in that: in the step S3, direct current oxidation is adopted, wherein the concentration of oxalic acid in the electrolyte is 30g/L, the oxidation voltage is 50V, the temperature is 30-35 ℃, and the oxidation time is 30 min.
Example 4
S1, oil removal: putting the selected aluminum alloy into an acidic degreasing agent, a weakly alkaline degreasing agent or an organic solvent to clean grease;
s2, alkaline etching or polishing: performing alkaline etching or polishing treatment on the deoiled aluminum alloy to remove a natural oxidation film;
s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing the anode plate and the cathode plate in electrolyte, wherein the concentration of sulfuric acid is 60g/L, the concentration of oxalic acid is 20g/L, the concentration of magnesium sulfate is 1g/L, the oxidation voltage is 8V, the temperature is 28-31 ℃, and the oxidation time is 15 min;
s4, dyeing: immersing the aluminum alloy after AC oxidation in a dyeing solution containing Cu 2+ 、Co 2+ 、Cd 2+ 、Ni 2 + 、Sn 2+ The content of the black organic aqueous solution is 8 g/L; the solution temperature is 50-55 deg.C, and dyeing time is 3 min;
s5, hole sealing: placing the dyed aluminum alloy in a sealing liquid for sealing treatment; the sealing liquid contains nickel acetate and nickel fluoride; sealing at normal temperature, wherein Ni 2+ : 0.8-1.3 g/L; at 25-35 deg.C for 5 min.
S6, drying: and (3) placing the aluminum alloy subjected to hole sealing in a drying box at the temperature of 60-70 ℃ for 15 min.
Comparative example 4
Comparative example 4 differs from example 4 in that: in the step S3, direct current oxidation is adopted, the sulfuric acid concentration of the electrolyte is 60g/L, the oxalic acid concentration is 20g/L, the oxidation voltage is 18V, the temperature is 28-31 ℃, and the oxidation time is 20 min.
The alloy properties obtained in the above examples and comparative examples were tested and summarized in the following table:
TABLE 1
The voltage used by the alternating current oxidation is lower than that of the conventional direct current oxidation, the energy is saved, the film forming rate of an alternating current oxidation product is higher than that of the conventional direct current oxidation, the production time is short, and the production efficiency is greatly improved. As can be seen from table 1, the product obtained by the ac anodizing technique of the present invention has the same film thickness range, and compared with the conventional dc anodizing technique, the product of the present invention does not crack or show white when being bent around a finger under the condition that the corrosion resistance and the insulation performance are not reduced; the process disclosed by the invention can be used for greatly improving the flexibility and the bending performance of a coating layer on the aluminum alloy, and is more suitable for products such as aluminum strips, foils, wires and the like.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. An aluminum alloy alternating current anodic oxidation process is characterized by comprising the following steps:
s1, oil removal: putting the aluminum alloy into a degreasing agent to clean grease;
s2, alkaline etching or polishing: performing alkaline etching or polishing treatment on the deoiled aluminum alloy to remove a natural oxidation film;
s3, alternating current oxidation: an alternating current type rectifier is used as a power supply, the aluminum alloy subjected to alkaline etching or polishing is used as an anode plate, and an aluminum, lead or graphite plate is used as a cathode plate; placing the anode plate and the cathode plate in electrolyte, wherein the voltage is 2-8V, and the current density is 1.0-5.0A/dm 2 The temperature of the electrolyte is 20-40 ℃, and the oxidation time is 10-60 min; the electrolyte comprises sulfuric acid and/or oxalic acid;
s4, hole sealing: placing the dyed aluminum alloy in a sealing liquid for sealing treatment;
s5, drying: and (3) placing the aluminum alloy subjected to hole sealing in a drying box at the temperature of 60-70 ℃ for 10-20 min.
2. The aluminum alloy alternating current anodic oxidation process of claim 1, characterized in that: and the step S3.1 of dyeing is also included between the steps S3 and S4, the aluminum alloy after alternating current oxidation is immersed in a dyeing solution for 1-20min, and the dyeing solution contains organic dye and/or inorganic dye.
3. The aluminum alloy alternating current anodic oxidation process of claim 1, characterized in that: in step S1, the oil remover is an acidic oil remover, a weakly basic oil remover, or an organic solvent.
4. The aluminum alloy alternating current anodic oxidation process of claim 1, characterized in that: in step S3, the electrolyte further includes at least one of aluminum sulfate, magnesium chloride, and magnesium sulfate.
5. The aluminum alloy alternating current anodic oxidation process of claim 4, characterized in that: the concentration of sulfuric acid in the electrolyte is 50-250g/L, the concentration of oxalic acid is 0-30g/L, the concentration of aluminum sulfate is 0.1-2g/L, the concentration of magnesium chloride is 0.1-2g/L, and the concentration of magnesium sulfate is 0.1-1 g/L.
6. The aluminum alloy alternating current anodic oxidation process according to claim 2, characterized in that: what is needed isThe staining solution contains Cu 2+ 、Co 2+ 、Cd 2+ 、Ni 2+ 、Sn 2+ A metal salt solution of (a).
7. The aluminum alloy alternating current anodic oxidation process of claim 1, characterized in that: in step S4, the sealing liquid contains nickel acetate and nickel fluoride.
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| CN202210369890.8A CN114892236A (en) | 2022-04-08 | 2022-04-08 | Aluminum alloy alternating-current anodic oxidation process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06192888A (en) * | 1991-02-15 | 1994-07-12 | Takada Kenkyusho:Kk | High-corrosion-resistance surface treatment of aluminum alloy |
| JPH10265996A (en) * | 1997-03-21 | 1998-10-06 | Satoshi Kawai | Anodic oxidation treatment of aluminum or its alloy with good alkaline corrosion resistance |
| CN104822865A (en) * | 2012-10-30 | 2015-08-05 | 海德鲁铝业钢材有限公司 | Coated aluminum strip and method for manufacturing |
| CN108221023A (en) * | 2016-12-22 | 2018-06-29 | 无锡金科涂装有限公司 | Aluminium alloy anode oxide technique |
| CN110241449A (en) * | 2019-06-24 | 2019-09-17 | 辽宁忠旺集团有限公司 | A kind of method of 6 line aluminium alloy surface insulation oxidation |
-
2022
- 2022-04-08 CN CN202210369890.8A patent/CN114892236A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06192888A (en) * | 1991-02-15 | 1994-07-12 | Takada Kenkyusho:Kk | High-corrosion-resistance surface treatment of aluminum alloy |
| JPH10265996A (en) * | 1997-03-21 | 1998-10-06 | Satoshi Kawai | Anodic oxidation treatment of aluminum or its alloy with good alkaline corrosion resistance |
| CN104822865A (en) * | 2012-10-30 | 2015-08-05 | 海德鲁铝业钢材有限公司 | Coated aluminum strip and method for manufacturing |
| CN108221023A (en) * | 2016-12-22 | 2018-06-29 | 无锡金科涂装有限公司 | Aluminium alloy anode oxide technique |
| CN110241449A (en) * | 2019-06-24 | 2019-09-17 | 辽宁忠旺集团有限公司 | A kind of method of 6 line aluminium alloy surface insulation oxidation |
Non-Patent Citations (2)
| Title |
|---|
| 吴小源 等: "机械制造工程训练 第3版", 华南理工大学出版社, pages: 86 - 87 * |
| 梁成浩 等: "铝箔交流电氧化工艺的研究", 表面处理, vol. 26, no. 5, pages 15 - 18 * |
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