CN113529151A - Anodic oxidation method for aluminum plate - Google Patents
Anodic oxidation method for aluminum plate Download PDFInfo
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- CN113529151A CN113529151A CN202110854838.7A CN202110854838A CN113529151A CN 113529151 A CN113529151 A CN 113529151A CN 202110854838 A CN202110854838 A CN 202110854838A CN 113529151 A CN113529151 A CN 113529151A
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- aluminum plate
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- acid solution
- anodic oxidation
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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
- C25D11/246—Chemical after-treatment for sealing layers
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses an anodic oxidation method for an aluminum plate. The method comprises the steps of firstly cleaning an aluminum plate in a sodium hydroxide solution, then placing the aluminum plate into a phosphoric acid solution for erosion, immersing the aluminum plate into a malic acid solution for anodic oxidation to obtain a corrosion-resistant aluminum plate, and finally drying the aluminum plate after sealing treatment to obtain an aluminum plate anodic oxide film. According to the invention, the aluminum plate is subjected to anodic oxidation in malic acid solution, and the sealed aluminum plate is subjected to sealing treatment by using the copolymer of sodium acetate and maleic anhydride acrylic acid, so that the prepared aluminum plate has high bonding strength, thicker oxide film and stronger corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of surface treatment of aluminum plates, and particularly relates to an aluminum plate anodizing method.
Background
The aluminum plate is one of aluminum material types, and is a plate-type aluminum product which is finally manufactured by rolling, extruding, stretching, forging and other methods of an aluminum billet by a plastic processing method, and annealing, solution treatment, quenching, natural aging and artificial aging treatment are carried out on a finished product in order to ensure the final performance of the plate. In order to improve the corrosion resistance of the aluminum plate, an oxide film having corrosion resistance is generally formed by a surface treatment method of primary anodic oxidation.
Patent 201910622987.3 discloses an aluminum profile anodizing electrolyte and a preparation method thereof, and an aluminum profile anodizing process. The electrolyte consists of phytic acid, fulvic acid, a pH regulator and water, wherein the concentration of the phytic acid in the electrolyte is 70-90 g/L, the concentration of the fulvic acid in the electrolyte is 35-55 g/L, and the pH value of the electrolyte is 2.0-2.8. The electrolyte is compounded by phytic acid and fulvic acid, and the prepared aluminum profile has a thin oxide film and poor corrosion resistance.
Patent 201710838203.1 discloses a highly cementitious and corrosion resistant anodizing process based on aluminum alloys. The method comprises the following steps: (1) degreasing aluminum alloy in a mixed solution of sodium hydroxide, sodium phosphate and sodium carbonate; (2) sequentially carrying out alkali washing and acid washing on the degreased aluminum alloy; (3) anodizing the cleaned aluminum alloy with a mixed solution of sulfuric acid and aluminum sulfate; (4) and sealing the anodized aluminum alloy by using a mixed additive and drying to obtain the aluminum alloy anodic oxide film. The aluminum profile prepared by the method has low bonding strength, thin oxide film and poor corrosion resistance.
Disclosure of Invention
The invention aims to provide an aluminum plate anodizing method.
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution for erosion;
(3) immersing the aluminum plate treated in the step (2) into malic acid solution for anodic oxidation to prepare a corrosion-resistant aluminum plate;
(4) and (4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain the anodic oxide film of the aluminum plate.
The concentration of the sodium hydroxide solution in the step (1) is 120-180g/L, and the cleaning time is 1-5 min.
The concentration of the phosphoric acid solution in the step (2) is 150-250g/L, and the erosion time is 3-10 min.
The concentration of the malic acid solution in the step (3) is 80-200 g/L.
And (3) anodizing at 25-40 ℃ at 30-50V for 30-60 min.
Anodizing in the step (3)Has a current density of 0.8-2.5A/dm2。
The mixed additive consists of sodium acetate with the concentration of 50-150ppm and maleic anhydride acrylic acid copolymer with the concentration of 10-50 ppm.
The sealing treatment temperature is 80-110 deg.C, and the treatment time is 30-60 min.
The invention has the beneficial effects that: according to the invention, the aluminum plate is subjected to anodic oxidation in malic acid solution, and the sealed aluminum plate is subjected to sealing treatment by using the copolymer of sodium acetate and maleic anhydride acrylic acid, so that the prepared aluminum plate has high bonding strength, thicker oxide film and stronger corrosion resistance.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 150g/L for 3 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 200g/L for erosion for 8 min;
(3) immersing the aluminum plate treated in the step (2) into malic acid solution with the concentration of 120g/L for anodic oxidation to obtain a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 1.5A/dm2The temperature is 30 ℃, the voltage is 40V, and the time is 50 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain an anodic oxide film of the aluminum plate; the mixed additive consists of sodium acetate with the concentration of 100ppm and maleic anhydride acrylic acid copolymer with the concentration of 30 ppm; the sealing treatment temperature is 90 ℃, and the treatment time is 50 min.
Example 2
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 130g/L for 5 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 160g/L for erosion for 10 min;
(3) immersing the aluminum plate treated in the step (2) into malic acid solution with the concentration of 100g/L for anodic oxidation to obtain a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 0.9A/dm2The temperature is 35 ℃, the voltage is 50V, and the time is 60 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain an anodic oxide film of the aluminum plate; the mixed additive consists of sodium acetate with the concentration of 60ppm and maleic anhydride acrylic acid copolymer with the concentration of 20 ppm; the sealing treatment temperature is 80 ℃, and the treatment time is 60 min.
Example 3
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 180g/L for 2 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 250g/L for erosion for 3 min;
(3) immersing the aluminum plate treated in the step (2) into malic acid solution with the concentration of 200g/L for anodic oxidation to obtain a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 2.5A/dm2The temperature is 28 ℃, the voltage is 30V, and the time is 30 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain an anodic oxide film of the aluminum plate; the mixed additive consists of sodium acetate with the concentration of 150ppm and maleic anhydride acrylic acid copolymer with the concentration of 50 ppm; the sealing treatment temperature is 110 ℃, and the treatment time is 30 min.
Comparative example 1
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 150g/L for 3 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 200g/L for erosion for 8 min;
(3) immersing the aluminum plate treated in the step (2) into malic acid solution with the concentration of 120g/L for anodic oxidation to obtain a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 1.5A/dm2The temperature is 30 ℃, the voltage is 40V, and the time is 50 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using sodium acetate with the concentration of 100ppm, and drying to obtain an aluminum plate anodic oxide film; the sealing treatment temperature is 90 ℃, and the treatment time is 50 min.
Comparative example 2
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 150g/L for 3 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 200g/L for erosion for 8 min;
(3) immersing the aluminum plate treated in the step (2) into malic acid solution with the concentration of 120g/L for anodic oxidation to obtain a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 1.5A/dm2The temperature is 30 ℃, the voltage is 40V, and the time is 50 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using 30ppm of maleic anhydride acrylic acid copolymer, and drying to obtain an anodic oxide film of the aluminum plate; the sealing treatment temperature is 90 ℃, and the treatment time is 50 min.
Comparative example 3
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 150g/L for 3 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 200g/L for erosion for 8 min;
(3) will go through the steps of (2) Immersing the treated aluminum plate into a sulfuric acid solution with the concentration of 120g/L for anodic oxidation to prepare a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 1.5A/dm2The temperature is 30 ℃, the voltage is 40V, and the time is 50 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain an anodic oxide film of the aluminum plate; the mixed additive consists of sodium acetate with the concentration of 100ppm and maleic anhydride acrylic acid copolymer with the concentration of 30 ppm; the sealing treatment temperature is 90 ℃, and the treatment time is 50 min.
Comparative example 4
An aluminum plate anodizing method comprises the following steps:
(1) cleaning an aluminum plate in a sodium hydroxide solution with the concentration of 150g/L for 3 min;
(2) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution with the concentration of 200g/L for erosion for 8 min;
(3) immersing the aluminum plate treated in the step (2) into a citric acid solution with the concentration of 120g/L for anodic oxidation to prepare a corrosion-resistant aluminum plate; the current density of the anodic oxidation is 1.5A/dm2The temperature is 30 ℃, the voltage is 40V, and the time is 50 min;
(4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain an anodic oxide film of the aluminum plate; the mixed additive consists of sodium acetate with the concentration of 100ppm and maleic anhydride acrylic acid copolymer with the concentration of 30 ppm; the sealing treatment temperature is 90 ℃, and the treatment time is 50 min.
Experimental example 1: lap shear test
After the Dow Betamate 4600F structural adhesive is used for bonding and baking the aluminum plate test piece, the bonding strength is measured, and the experimental results are shown in the table 1:
TABLE 1
Note: represents P <0.05 compared to example 1.
Experimental example 2: corrosion resistance test
The method adopts a Bubble Test, utilizes a hydrochloric acid solution with the mass fraction solubility of 5%, and comprises the following specific operations: the method comprises the following steps of adhering a glass tube on the surface of an aluminum plate by using covering glue, adding a hydrochloric acid solution with the mass fraction solubility of 5% for testing into the glass tube, wherein the liquid level is 2-3 cm, continuously emitting more than three bubbles at the same point of the solution in a testing area within one second, representing the end of testing, and showing the testing result in a table 2:
TABLE 2
Note: represents P <0.05 compared to example 1.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An aluminum plate anodizing method is characterized by comprising the following steps:
(1) and (3) washing the aluminum plate in a sodium hydroxide solution.
(2) And (3) putting the aluminum plate cleaned in the step (1) into a phosphoric acid solution for erosion.
(3) And (3) immersing the aluminum plate treated in the step (2) into malic acid solution for anodic oxidation to obtain the corrosion-resistant aluminum plate.
(4) And (4) sealing the corrosion-resistant aluminum plate prepared in the step (3) by using a mixed additive, and drying to obtain the anodic oxide film of the aluminum plate.
2. The method as claimed in claim 1, wherein the concentration of the sodium hydroxide solution in step (1) is 180g/L, and the cleaning time is 1-5 min.
3. The method as claimed in claim 1, wherein the concentration of the phosphoric acid solution in step (2) is 150-250g/L, and the etching time is 3-10 min.
4. The aluminum plate anodizing method of claim 1, wherein the concentration of the malic acid solution in the step (3) is 80-200 g/L.
5. The aluminum plate anodizing method of claim 1, wherein the anodizing temperature of step (3) is 25-40 ℃, the voltage is 30-50V, and the time is 30-60 min.
6. The method of claim 1, wherein the current density of the anodic oxidation of step (3) is 0.8-2.5A/dm2。
7. The method of claim 1, wherein the mixed additive is composed of sodium acetate with a concentration of 50-150ppm and maleic anhydride acrylic acid copolymer with a concentration of 10-50 ppm.
8. The aluminum plate anodizing method of claim 1, wherein the sealing treatment is performed at a temperature of 80-110 ℃ for 30-60 min.
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| CN202110854838.7A CN113529151A (en) | 2021-07-28 | 2021-07-28 | Anodic oxidation method for aluminum plate |
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| CN202110854838.7A CN113529151A (en) | 2021-07-28 | 2021-07-28 | Anodic oxidation method for aluminum plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108221023A (en) * | 2016-12-22 | 2018-06-29 | 无锡金科涂装有限公司 | Aluminium alloy anode oxide technique |
| CN108950638A (en) * | 2018-07-27 | 2018-12-07 | 歌尔股份有限公司 | Aluminum alloy materials and preparation method thereof |
| CN109518252A (en) * | 2017-09-18 | 2019-03-26 | 中铝材料应用研究院有限公司 | A kind of high splicing based on aluminium alloy and corrosion resistant anode oxidation method |
| CN109518253A (en) * | 2017-09-18 | 2019-03-26 | 中铝材料应用研究院有限公司 | A kind of high splicing based on aluminum alloy surface and corrosion resistant anode oxidation method |
| CN110219031A (en) * | 2019-06-06 | 2019-09-10 | 北京航空航天大学 | Anodic oxidation electrolyte and method, the aluminum or aluminum alloy with anode oxide film |
-
2021
- 2021-07-28 CN CN202110854838.7A patent/CN113529151A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108221023A (en) * | 2016-12-22 | 2018-06-29 | 无锡金科涂装有限公司 | Aluminium alloy anode oxide technique |
| CN109518252A (en) * | 2017-09-18 | 2019-03-26 | 中铝材料应用研究院有限公司 | A kind of high splicing based on aluminium alloy and corrosion resistant anode oxidation method |
| CN109518253A (en) * | 2017-09-18 | 2019-03-26 | 中铝材料应用研究院有限公司 | A kind of high splicing based on aluminum alloy surface and corrosion resistant anode oxidation method |
| CN108950638A (en) * | 2018-07-27 | 2018-12-07 | 歌尔股份有限公司 | Aluminum alloy materials and preparation method thereof |
| CN110219031A (en) * | 2019-06-06 | 2019-09-10 | 北京航空航天大学 | Anodic oxidation electrolyte and method, the aluminum or aluminum alloy with anode oxide film |
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Application publication date: 20211022 |