CN110552040A - electrolytic coloring process for aluminum profile anodic copper oxide salt - Google Patents
electrolytic coloring process for aluminum profile anodic copper oxide salt Download PDFInfo
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- CN110552040A CN110552040A CN201910874704.4A CN201910874704A CN110552040A CN 110552040 A CN110552040 A CN 110552040A CN 201910874704 A CN201910874704 A CN 201910874704A CN 110552040 A CN110552040 A CN 110552040A
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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
- C25D11/16—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
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/20—Electrolytic after-treatment
- C25D11/22—Electrolytic after-treatment for colouring layers
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Abstract
The invention discloses an electrolytic coloring process of an aluminum profile anodic copper oxide salt, which comprises the following process steps: 1) pre-treating; 2) anodizing; 3) sensitizing treatment; 4) AC hole expansion; 5) electrolytic coloring copper salt: carrying out alternating current electrolytic coloring on copper salt by adopting coloring liquid consisting of 3-7% of sulfuric acid, 3-7% of copper sulfate, 25-35% of magnesium sulfate, 1-2.5% of dispersing agent and the balance of water under the process conditions of alternating current voltage of 5-15V, time of 3-10 min and temperature of room temperature to obtain a semi-finished product; 6) semi-hole sealing treatment; 7) and (5) performing electrophoresis treatment to obtain a finished product. The invention improves the coloring effect of the copper salt in many aspects by adjusting the process steps and parameters and combining sensitization treatment, alternating current hole expanding and alternating current electrolytic coloring copper salt, so that the processed aluminum profile surface film has good decoration, high hardness, strong binding force, good wear resistance and strong corrosion resistance, and the process is suitable for surface treatment of aluminum profiles with various sizes, specifications and forms.
Description
Technical Field
The invention relates to the technical field of surface treatment of aluminum profiles, in particular to an aluminum profile coloring process.
background
with the increasingly wide application of aluminum alloy materials, the aluminum alloy can naturally form an oxide film in the atmosphere, but the oxide film is thin, loose and porous and cannot be used as a reliable protective and decorative film. In order to enhance the protection and decoration of the aluminum alloy oxide film, the surface thereof is often subjected to anodic oxidation treatment and electrolytic coloring treatment. After anodic oxidation and electrolytic coloring, the corrosion resistance, weather resistance and wear resistance of the aluminum alloy are obviously improved. At present, a plurality of electrolytic coloring processes for aluminum alloy materials exist, but the copper salt coloring technology causes obvious color difference after coloring due to edge effect and point discharge which are difficult to solve, and the problems that a film layer of a treated product is poor in corrosion resistance after a subsequent process, the film color is not uniform, and even obvious color tone change and color fading occur are the reason that batch production is not formed all the time.
disclosure of Invention
the invention aims to provide an electrolytic coloring process of anodic copper oxide salt for aluminum profiles, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: an electrolytic coloring process of anodic copper oxide salt of aluminum profile comprises the following process steps:
1) pretreatment: cleaning, alkaline etching and polishing the aluminum profile in sequence;
2) Anodic oxidation: carrying out anodic oxidation treatment on the aluminum profile by using sulfuric acid and an aluminum ion solution;
3) Sensitization treatment: soaking the aluminum profile in sensitizing solution containing a reducing agent and a complexing agent for sensitizing treatment;
4) AC hole expansion: performing alternating-current hole expanding on the aluminum alloy by using a phosphoric acid solution;
5) electrolytic coloring copper salt: carrying out alternating current electrolytic coloring on copper salt by adopting coloring liquid consisting of 3-7% of sulfuric acid, 3-7% of copper sulfate, 25-35% of magnesium sulfate, 1-2.5% of dispersing agent and the balance of water under the process conditions of alternating current voltage of 5-15V, time of 3-10 min and temperature of room temperature to obtain a semi-finished product;
6) semi-hole sealing treatment: carrying out medium-temperature semi-hole sealing treatment on the semi-finished product;
7) electrophoresis treatment: and placing the aluminum profile subjected to semi-hole sealing in an electrophoresis tank for electrophoresis treatment to obtain a finished product.
The invention adopts the combination of sensitization treatment and alternating current hole expansion as the pretreatment process of electrolytic copper salt coloring, modifies micropores of an anodic oxide film layer formed on the surface of an aluminum profile, changes the microcosmic composition or structure of the film, and enables the film layer to contain substances which enable Cu 2+ to have a reduction trend, so that Cu 2+ reacts on the surface and the interior of the aluminum profile in the later electrolytic copper salt coloring process, and the defect of film layer color fading caused by the shedding of copper atoms on the surface of the film layer is effectively avoided.
As a further improvement of the scheme, in the step 2), the concentration of the sulfuric acid and the aluminum ion solution in the anodic oxidation process is 80-100 g/L, Al 3+ 1-3 g/L, the anodic oxidation voltage is 15-30V, the time is 10-30 min, and the temperature is 25-30 ℃.
As a further improvement of the above scheme, the reducing agent in step 3) is glyoxylic acid.
As a further improvement of the above scheme, the complexing agent in step 3) is citric acid.
as a further improvement of the scheme, in the step 4), the concentration of the phosphoric acid solution is 60-80 g/L, the voltage is 10-15V, and the time is 2-5 min.
As a further improvement of the above scheme, the process parameters in the electrophoresis treatment process in step 7) are as follows: the voltage is 100-120V, pH is 7.5-8.5, the temperature is 30-35 ℃, and the processing time is 30-60 s.
The invention has the beneficial effects that: the invention improves the coloring effect of the copper salt in many aspects by adjusting the process steps and parameters and combining sensitization treatment, alternating current hole expanding and alternating current electrolytic coloring copper salt, so that the processed aluminum profile surface film has good decoration, high hardness, strong binding force, good wear resistance and strong corrosion resistance, and the process is suitable for surface treatment of aluminum profiles with various sizes, specifications and forms.
Detailed Description
the present invention is specifically described below with reference to examples in order to facilitate understanding of the present invention by those skilled in the art. It should be particularly noted that the examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, as non-essential improvements and modifications to the invention may occur to those skilled in the art, which fall within the scope of the invention as defined by the appended claims. Meanwhile, the raw materials mentioned below are not specified in detail and are all commercial products; the process steps or preparation methods not mentioned in detail are all process steps or preparation methods known to the person skilled in the art.
example 1
An electrolytic coloring process of anodic copper oxide salt of aluminum profile comprises the following process steps:
1) pretreatment: cleaning, alkaline etching and polishing the aluminum profile in sequence;
2) Anodic oxidation: carrying out anodic oxidation treatment on the aluminum profile by using a mixed solution of 80g/L sulfuric acid and 3g/L aluminum ion solution, wherein the anodic oxidation voltage is 15V, the time is 30min, and the temperature is 25 ℃;
3) sensitization treatment: soaking the aluminum profile in a sensitizing solution containing glyoxylic acid and citric acid for sensitizing treatment;
4) AC hole expansion: performing alternating-current reaming on the aluminum alloy by using a phosphoric acid solution with the concentration of 80g/L, and controlling the voltage to be 10V and the time to be 5 min;
5) Electrolytic coloring copper salt: performing alternating current electrolysis on coloring copper salt by using coloring liquid consisting of 3% sulfuric acid, 7% copper sulfate, 25% magnesium sulfate, 2.5% dispersing agent and the balance of water under the process conditions of alternating current voltage of 15V, time of 3min and temperature of room temperature to obtain a semi-finished product;
6) Semi-hole sealing treatment: carrying out medium-temperature semi-hole sealing treatment on the semi-finished product;
7) electrophoresis treatment: and (3) placing the aluminum profile subjected to the semi-hole sealing in an electrophoresis tank for electrophoresis treatment, controlling the voltage 120V, pH to be 7.5, the temperature to be 35 ℃ and the treatment time to be 30s, and obtaining the finished product of the embodiment 1.
Example 2
an electrolytic coloring process of anodic copper oxide salt of aluminum profile comprises the following process steps:
1) pretreatment: cleaning, alkaline etching and polishing the aluminum profile in sequence;
2) anodic oxidation: carrying out anodic oxidation treatment on the aluminum profile by using a mixed solution of sulfuric acid with the concentration of 100g/L and a solution with the concentration of aluminum ions of 1g/L, wherein the anodic oxidation voltage is 30V, the time is 10min, and the temperature is 30 ℃;
3) sensitization treatment: soaking the aluminum profile in a sensitizing solution containing glyoxylic acid and citric acid for sensitizing treatment;
4) AC hole expansion: performing alternating-current reaming on the aluminum alloy by using a phosphoric acid solution with the concentration of 60g/L, controlling the voltage to be 15V and the time to be 2 min;
5) Electrolytic coloring copper salt: carrying out alternating current electrolytic coloring of copper salt by using coloring liquid consisting of 7% sulfuric acid, 3% copper sulfate, 35% magnesium sulfate, 1% dispersing agent and the balance of water under the process conditions of alternating current voltage of 15V, time of 3min, temperature and room temperature to obtain a semi-finished product;
6) Semi-hole sealing treatment: carrying out medium-temperature semi-hole sealing treatment on the semi-finished product;
7) Electrophoresis treatment: and (3) placing the aluminum profile subjected to the semi-hole sealing in an electrophoresis tank for electrophoresis treatment, controlling the voltage of 100V, pH to be 8.5, the temperature to be 30 ℃ and the treatment time to be 60s, and obtaining the finished product of the embodiment 2.
example 3
an electrolytic coloring process of anodic copper oxide salt of aluminum profile comprises the following process steps:
1) pretreatment: cleaning, alkaline etching and polishing the aluminum profile in sequence;
2) Anodic oxidation: carrying out anodic oxidation treatment on the aluminum profile by using a mixed solution of sulfuric acid with the concentration of 90g/L and a solution with the concentration of aluminum ions of 2g/L, wherein the anodic oxidation voltage is 20V, the time is 15min, and the temperature is 28 ℃;
3) sensitization treatment: soaking the aluminum profile in a sensitizing solution containing glyoxylic acid and citric acid for sensitizing treatment;
4) AC hole expansion: performing alternating-current reaming on the aluminum alloy by using a phosphoric acid solution with the concentration of 70g/L, and controlling the voltage to be 12V and the time to be 4 min;
5) Electrolytic coloring copper salt: performing alternating current electrolytic coloring of copper salt by using coloring liquid consisting of 5% sulfuric acid, 5% copper sulfate, 30% magnesium sulfate, 2% dispersant and the balance of water under the process conditions of alternating current voltage of 10V, time of 8min, temperature and room temperature to obtain a semi-finished product;
6) semi-hole sealing treatment: carrying out medium-temperature semi-hole sealing treatment on the semi-finished product;
7) Electrophoresis treatment: and (3) placing the aluminum profile subjected to the semi-hole sealing in an electrophoresis tank for electrophoresis treatment, controlling the voltage of 120V, pH to be 8, the temperature to be 30 ℃ and the treatment time to be 50s, and obtaining the finished product of the embodiment 3.
Example 4
an electrolytic coloring process of anodic copper oxide salt of aluminum profile comprises the following process steps:
1) pretreatment: cleaning, alkaline etching and polishing the aluminum profile in sequence;
2) anodic oxidation: carrying out anodic oxidation treatment on the aluminum profile by using a mixed solution of sulfuric acid with the concentration of 100g/L and a solution with the concentration of aluminum ions of 2g/L, wherein the anodic oxidation voltage is 25V, the time is 15min, and the temperature is 25 ℃;
3) Sensitization treatment: soaking the aluminum profile in a sensitizing solution containing glyoxylic acid and citric acid for sensitizing treatment;
4) AC hole expansion: performing alternating-current reaming on the aluminum alloy by using a phosphoric acid solution with the concentration of 65g/L, controlling the voltage to be 15V and the time to be 4 min;
5) Electrolytic coloring copper salt: carrying out alternating current electrolytic coloring of copper salt by using coloring liquid consisting of 4% sulfuric acid, 6% copper sulfate, 28% magnesium sulfate, 2% dispersing agent and the balance of water under the process conditions of alternating current voltage of 12V, time of 7min, temperature and room temperature to obtain a semi-finished product;
6) Semi-hole sealing treatment: carrying out medium-temperature semi-hole sealing treatment on the semi-finished product;
7) Electrophoresis treatment: and (3) placing the aluminum profile subjected to the semi-hole sealing in an electrophoresis tank for electrophoresis treatment, controlling the voltage 110V, pH to be 8.5, the temperature to be 35 ℃ and the treatment time to be 45s, and obtaining the finished product of the embodiment 4.
example 5: performance detection
The products obtained in examples 1 to 4 were subjected to correlation performance tests, and the test results are shown in table 1 below.
TABLE 1 Performance test results
the above embodiments are preferred embodiments of the present invention, and all similar processes and equivalent variations to those of the present invention should fall within the scope of the present invention.
Claims (6)
1. an electrolytic coloring process of anodic copper oxide salt for aluminum profiles is characterized by comprising the following process steps:
1) Pretreatment: cleaning, alkaline etching and polishing the aluminum profile in sequence;
2) Anodic oxidation: carrying out anodic oxidation treatment on the aluminum profile by using sulfuric acid and an aluminum ion solution;
3) sensitization treatment: soaking the aluminum profile in sensitizing solution containing a reducing agent and a complexing agent for sensitizing treatment;
4) AC hole expansion: performing alternating-current hole expanding on the aluminum alloy by using a phosphoric acid solution;
5) Electrolytic coloring copper salt: carrying out alternating current electrolytic coloring on copper salt by adopting coloring liquid consisting of 3-7% of sulfuric acid, 3-7% of copper sulfate, 25-35% of magnesium sulfate, 1-2.5% of dispersing agent and the balance of water under the process conditions of alternating current voltage of 5-15V, time of 3-10 min and temperature of room temperature to obtain a semi-finished product;
6) Semi-hole sealing treatment: carrying out medium-temperature semi-hole sealing treatment on the semi-finished product;
7) Electrophoresis treatment: and placing the aluminum profile subjected to semi-hole sealing in an electrophoresis tank for electrophoresis treatment to obtain a finished product.
2. The electrolytic coloring process of the aluminum profile anodic copper oxide salt according to claim 1, characterized in that in the step 2) anodic oxidation process, the concentration of the sulfuric acid and the aluminum ion solution is 80-100 g/L, Al 3+ 1-3 g/L, the anodic oxidation voltage is 15-30V, the time is 10-30 min, and the temperature is 25-30 ℃.
3. The electrolytic coloring process of the anodic copper oxide salt for the aluminum profile according to claim 1, characterized in that: the reducing agent in the step 3) is glyoxylic acid.
4. The electrolytic coloring process of the anodic copper oxide salt for the aluminum profile according to claim 1, characterized in that: the complexing agent in the step 3) is citric acid.
5. the electrolytic coloring process of the anodic copper oxide salt for the aluminum profile according to claim 1, characterized in that: in the step 4), the concentration of the phosphoric acid solution is 60-80 g/L, the voltage is 10-15V, and the time is 2-5 min.
6. The electrolytic coloring process of the anodic copper oxide salt for the aluminum profile according to claim 1, characterized in that: step 7) technological parameters in the electrophoresis treatment process are as follows: the voltage is 100-120V, pH is 7.5-8.5, the temperature is 30-35 ℃, and the processing time is 30-60 s.
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Cited By (2)
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| CN115449878A (en) * | 2022-08-24 | 2022-12-09 | 四会市建鑫装饰材料有限公司 | Black coloring process for aluminum profile |
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| CN115449878A (en) * | 2022-08-24 | 2022-12-09 | 四会市建鑫装饰材料有限公司 | Black coloring process for aluminum profile |
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Application publication date: 20191210 |