CN110938854A - Surface anticorrosion treatment method for aluminum alloy - Google Patents
Surface anticorrosion treatment method for aluminum alloy Download PDFInfo
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- CN110938854A CN110938854A CN201911280522.0A CN201911280522A CN110938854A CN 110938854 A CN110938854 A CN 110938854A CN 201911280522 A CN201911280522 A CN 201911280522A CN 110938854 A CN110938854 A CN 110938854A
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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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses an aluminum alloy surface anticorrosion treatment method, which comprises the following steps: a. sequentially dedusting and drying the aluminum alloy to obtain a1 product; b. placing the product a1 in a roller polishing machine with a motor rotating speed of 80-90 r/min, adding a polishing agent, and performing polishing treatment for 50min to obtain a product b 1; c. washing the product b1 with water, and defatting to obtain product c 1; d. washing the product c1 with water and performing alkaline etching treatment to obtain product d 1; e. washing the d1 product with deionized water, and oxidizing the electrode to obtain an e1 product; f. and sealing the hole of the e1 product to obtain the finished product of the aluminum alloy. The invention has the advantages that the oxidized electrolyte is not polluted, and the product percent of pass is relatively higher.
Description
Technical Field
The invention relates to an aluminum alloy metal processing technology, in particular to an aluminum alloy surface anticorrosion treatment method.
Background
Aluminum alloy is a non-ferrous metal structural material which is most widely applied in industry, and at present, aluminum alloy is the most widely applied alloy.
The surface of the aluminum alloy is oxidized in the atmosphere to form a layer of natural oxidation film, but the natural oxidation film is easily corroded, so that the service life of the aluminum alloy material is greatly shortened. Therefore, the industry generally adopts surface treatment technology to improve various properties of aluminum alloy, such as corrosion resistance, surface mechanical properties and the like.
The aluminum alloy surface machining adopted by the existing factory is simple electrode oxidation machining, and only simple cleaning pretreatment is carried out on the aluminum material in the actual production process, so that impurity metal on the surface of the aluminum material cannot be effectively removed, and further the electrolyte is polluted to influence the oxidation effect. Therefore, the surface corrosion prevention technology adopted by the current factory has the problems of polluted oxidation electrolyte and low product percent of pass.
Disclosure of Invention
The invention aims to provide a surface anticorrosion treatment method of an aluminum alloy. The invention has the advantages that the oxidized electrolyte is not polluted, and the product percent of pass is relatively higher.
The technical scheme of the invention is as follows: an aluminum alloy surface anticorrosion treatment method comprises the following steps:
a. sequentially dedusting and drying the aluminum alloy to obtain a1 product; the dust removal is to immerse the aluminum alloy into a metal cleaning agent for scrubbing;
b. placing the product a1 in a roller polishing machine with a motor rotating speed of 80-90 r/min, adding a polishing agent, and performing polishing treatment for 50min to obtain a product b 1; the polishing agent is aluminum product polishing solution;
c. washing the product b1 with water, and defatting to obtain product c 1; the degreasing treatment is to put the washed b1 product into degreasing liquid consisting of 40-60g/L of anhydrous sodium carbonate, 40-60g/L of trisodium phosphate and 20-30 g/L of sodium silicate for 15-30 min;
d. washing the product c1 with water and performing alkaline etching treatment to obtain product d 1; the alkali etching treatment is to immerse the washed c1 product in 55-75 g/L sodium hydroxide solution for 60-80 s;
e. washing the d1 product with deionized water, and oxidizing the electrode to obtain an e1 product;
f. and sealing the hole of the e1 product to obtain the finished product of the aluminum alloy.
In the surface anticorrosion treatment method for aluminum alloy, the electrode oxidation in the step e is sulfuric acid anodic oxidation; the sulfuric acid anode is oxidized by taking d1 product as an anode, pure aluminum as a cathode and sulfuric acid and tartaric acid as electrolytes.
In the surface anticorrosion treatment method for the aluminum alloy, the concentration of sulfuric acid in the electrolyte is 70-90 g/L, and the concentration of tartaric acid in the electrolyte is 40-60 g/L; the sulfuric acid anodizing temperature is 17-23 ℃, the time is 30min, and the voltage is 20V.
In the surface anticorrosion treatment method for the aluminum alloy, the hole sealing agent in the step f is a sodium metaaluminate solution.
Compared with the prior art, the method has the advantages that polishing and alkaline etching pretreatment are carried out before the electrode is oxidized, so that other metal impurities remained on the surface of the aluminum alloy are effectively removed, the electrolyte is prevented from being polluted when the electrode is oxidized, the oxidation effect is ensured, and the qualification rate of products is improved. The surface of the aluminum alloy is preliminarily polished and finished by polishing, stubborn stains which are difficult to wash are removed, and oil stains on the surface of the aluminum alloy are removed by degreasing, so that electrolyte is prevented from being polluted, and the qualification rate of anodic oxidation is improved. And the natural oxide film on the surface of the aluminum alloy is removed through alkaline etching, so that the natural oxide film is prevented from influencing the oxidation effect of the electrode, and the anodic oxidation effect is further improved. Therefore, the method has the advantages that the oxidized electrolyte is not polluted, and the product percent of pass is relatively higher.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1. An aluminum alloy surface anticorrosion treatment method comprises the following steps:
a. sequentially dedusting and drying the aluminum alloy to obtain a1 product; the dust removal is to immerse the aluminum alloy into a metal cleaning agent for scrubbing;
b. placing the product a1 in a roller polishing machine with a motor rotating speed of 80-90 r/min, adding a polishing agent, and performing polishing treatment for 50min to obtain a product b 1; the polishing agent is aluminum product polishing solution;
c. washing the product b1 with water, and defatting to obtain product c 1; the degreasing treatment is to put the washed b1 product into degreasing liquid consisting of 40-60g/L of anhydrous sodium carbonate, 40-60g/L of trisodium phosphate and 20-30 g/L of sodium silicate for 15-30 min;
d. washing the product c1 with water and performing alkaline etching treatment to obtain product d 1; the alkali etching treatment is to immerse the washed c1 product in 55-75 g/L sodium hydroxide solution for 60-80 s;
e. washing the d1 product with deionized water, and oxidizing the electrode to obtain an e1 product;
f. and sealing the hole of the e1 product to obtain the finished product of the aluminum alloy.
The electrode oxidation in the step e is sulfuric acid anodic oxidation; the sulfuric acid anode is oxidized by taking d1 product as an anode, pure aluminum as a cathode and sulfuric acid and tartaric acid as electrolytes.
In the electrolyte, the concentration of sulfuric acid is 70-90 g/L, and the concentration of tartaric acid is 40-60 g/L; the sulfuric acid anodizing temperature is 17-23 ℃, the time is 30min, and the voltage is 20V.
And f, the hole sealing agent in the step f is a sodium metaaluminate solution.
Example 2. An aluminum alloy surface anticorrosion treatment method comprises the following steps:
a. sequentially dedusting and drying the aluminum alloy to obtain a1 product; the dust removal is to immerse the aluminum alloy into a metal cleaning agent for scrubbing;
b. placing the product a1 in a roller polishing machine with a motor rotating speed of 85r/min, adding a polishing agent, and performing polishing treatment for 50min to obtain a product b 1; the polishing agent is aluminum product polishing solution;
c. washing the product b1 with water, and defatting to obtain product c 1; the degreasing treatment is to put the washed b1 product into degreasing liquid consisting of 50g/L of anhydrous sodium carbonate, 50g/L of trisodium phosphate and 25g/L of sodium silicate for 25 min;
d. washing the product c1 with water and performing alkaline etching treatment to obtain product d 1; the alkali etching treatment is to immerse the washed c1 product in 65g/L sodium hydroxide solution for 70 s;
e. washing the d1 product with deionized water, and oxidizing the electrode to obtain an e1 product;
f. and sealing the hole of the e1 product to obtain the finished product of the aluminum alloy.
The electrode oxidation in the step e is sulfuric acid anodic oxidation; the sulfuric acid anode is oxidized by taking d1 product as an anode, pure aluminum as a cathode and sulfuric acid and tartaric acid as electrolytes.
In the electrolyte, the concentration of sulfuric acid is 80g/L, and the concentration of tartaric acid is 50 g/L; the anodic oxidation temperature of the sulfuric acid is 21 ℃, the time is 30min, and the voltage is 20V.
And f, the hole sealing agent in the step f is a sodium metaaluminate solution.
The working principle is as follows: immersing the aluminum alloy to be coated in a metal cleaning agent for preliminary decontamination and dust removal, and then putting the aluminum alloy into a roller polishing machine for polishing and finishing the surface. And (3) putting the polished aluminum alloy into degreasing liquid to remove oil stains, and then putting the aluminum alloy into sodium hydroxide solution to remove the natural oxide film with the slightly thin surface by alkali corrosion. And placing the pretreated aluminum alloy into electrolyte for anodic oxidation to form a flat and uniform oxide film, and placing the oxidized aluminum alloy into a sodium metaaluminate solution hole sealing agent for final hole sealing treatment to obtain the finished product aluminum alloy.
Claims (4)
1. The surface anticorrosion treatment method of the aluminum alloy is characterized by comprising the following steps:
a. sequentially dedusting and drying the aluminum alloy to obtain a1 product; the dust removal is to immerse the aluminum alloy into a metal cleaning agent for scrubbing;
b. placing the product a1 in a roller polishing machine with a motor rotating speed of 80-90 r/min, adding a polishing agent, and performing polishing treatment for 50min to obtain a product b 1; the polishing agent is aluminum product polishing solution;
c. washing the product b1 with water, and defatting to obtain product c 1; the degreasing treatment is to put the washed b1 product into degreasing liquid consisting of 40-60g/L of anhydrous sodium carbonate, 40-60g/L of trisodium phosphate and 20-30 g/L of sodium silicate for 15-30 min;
d. washing the product c1 with water and performing alkaline etching treatment to obtain product d 1; the alkali etching treatment is to immerse the washed c1 product in 55-75 g/L sodium hydroxide solution for 60-80 s;
e. washing the d1 product with deionized water, and oxidizing the electrode to obtain an e1 product;
f. and sealing the hole of the e1 product to obtain the finished product of the aluminum alloy.
2. The surface anticorrosion treatment method of an aluminum alloy, as recited in claim 1, wherein: the electrode oxidation in the step e is sulfuric acid anodic oxidation; the sulfuric acid anode is oxidized by taking d1 product as an anode, pure aluminum as a cathode and sulfuric acid and tartaric acid as electrolytes.
3. The surface anticorrosion treatment method of an aluminum alloy, as recited in claim 2, wherein: in the electrolyte, the concentration of sulfuric acid is 70-90 g/L, and the concentration of tartaric acid is 40-60 g/L; the temperature of the sulfuric acid anodic oxidation is 17-23 ℃, the time is 30min, and the voltage is 20V.
4. The surface anticorrosion treatment method of an aluminum alloy, as recited in claim 1, wherein: and f, the hole sealing agent in the step f is a sodium metaaluminate solution.
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| CN201911280522.0A CN110938854A (en) | 2019-12-13 | 2019-12-13 | Surface anticorrosion treatment method for aluminum alloy |
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| CN201911280522.0A CN110938854A (en) | 2019-12-13 | 2019-12-13 | Surface anticorrosion treatment method for aluminum alloy |
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| CN110938854A true CN110938854A (en) | 2020-03-31 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59113199A (en) * | 1982-12-17 | 1984-06-29 | Okuno Seiyaku Kogyo Kk | Surface treatment of aluminum alloy casting or aluminum alloy die casting |
| CN102321904A (en) * | 2011-08-25 | 2012-01-18 | 东北大学 | Mixed acid anodizing and hole sealing method of magnesium-containing high-silicon-content wrought aluminum alloy surface |
| CN105401199A (en) * | 2015-11-24 | 2016-03-16 | 安徽鑫发铝业有限公司 | Anodic oxidation surface treatment method for aluminum alloy section bar |
| CN105543932A (en) * | 2016-02-03 | 2016-05-04 | 温州安能科技有限公司 | Continuous surface treatment technology for aluminum alloy strip |
-
2019
- 2019-12-13 CN CN201911280522.0A patent/CN110938854A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59113199A (en) * | 1982-12-17 | 1984-06-29 | Okuno Seiyaku Kogyo Kk | Surface treatment of aluminum alloy casting or aluminum alloy die casting |
| CN102321904A (en) * | 2011-08-25 | 2012-01-18 | 东北大学 | Mixed acid anodizing and hole sealing method of magnesium-containing high-silicon-content wrought aluminum alloy surface |
| CN105401199A (en) * | 2015-11-24 | 2016-03-16 | 安徽鑫发铝业有限公司 | Anodic oxidation surface treatment method for aluminum alloy section bar |
| CN105543932A (en) * | 2016-02-03 | 2016-05-04 | 温州安能科技有限公司 | Continuous surface treatment technology for aluminum alloy strip |
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