CN111379000A - Paint-sprayed aluminum product containing fluorocarbon composite film and surface treatment method thereof - Google Patents
Paint-sprayed aluminum product containing fluorocarbon composite film and surface treatment method thereof Download PDFInfo
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- CN111379000A CN111379000A CN202010278140.0A CN202010278140A CN111379000A CN 111379000 A CN111379000 A CN 111379000A CN 202010278140 A CN202010278140 A CN 202010278140A CN 111379000 A CN111379000 A CN 111379000A
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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
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/46—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates
-
- 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
- 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
-
- 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
Abstract
The invention discloses a paint spraying aluminum product containing a fluorocarbon composite film and a surface treatment method thereof, wherein the surface of the aluminum product and the low-lying part of the aluminum product profile are covered with a layer of fluorocarbon composite film; the fluorocarbon composite film is a composite film containing O, Al, C and F components; the fluorocarbon composite film is covered with a fluorocarbon paint film. Placing the aluminum product to be treated in an oil removal polishing solution, and reacting until the surface of the aluminum product and the low-lying part of the profile are covered with a uniform composite salt film protective layer; the water-free composite membrane is placed in electrolytic oxidation liquid and is electrolytically oxidized into a layer of fluorocarbon composite membrane; and washing and drying the aluminum product subjected to electrolytic oxidation or dripping and drying the aluminum product and then performing paint spraying treatment to form a paint film on the fluorine-containing oxide film. According to the invention, when the aluminum product is painted, the organic-inorganic fluorocarbon composite film is generated on the surface of the aluminum product with the composite salt film protective layer through electrolysis, so that good adhesive force can be generated between the oxide film and the paint layer, the corrosion resistance is improved, and the service life of the product is prolonged.
Description
Technical Field
The invention relates to the technical field of surface treatment of aluminum products, in particular to a surface treatment technology of a paint spraying aluminum product containing a fluorocarbon composite film.
Background
The present spray painting treatment process of aluminium alloy product is a technological treatment process using organic solvent type or water-soluble solvent type polyvinylidene fluoride (PVDF) paint as film layer, and is characterized by that it mainly adopts the steps of degreasing, alkali washing, acid washing, water washing, chemical conversion film-forming (chromizing and chromium-free passivation), water washing and drying to make pretreatment, then according to the regulation of GB5237.5, makes the steps of priming paint, barrier paint, finishing paint, varnish and curing. The prior art has complex paint spraying process, 2-3 times of water washing are needed among all working procedures of oil removal, acid washing, alkali washing and chemical conversion film formation (chromizing chromium-free passivation) of the aluminum product, a large amount of water is consumed, a large amount of waste water, solid waste and hazardous waste are generated, a large amount of pollutants are brought to the environment, a large amount of chemical raw materials and water are consumed, and about 4Kg of Al is washed off and discharged in pretreatment per ton. The formed chemical conversion film is only (20-200 mg/m)2) And the corrosion resistance capability is general, and the corrosion under the film is easy to generate under the humid environment (such as seaside).
Therefore, the existing aluminum product paint spraying process has the defects of complex process flow, water waste and water pollution caused by a large amount of water washing, and increase of production cost caused by the waste of part of chemical raw materials.
Disclosure of Invention
The first technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the paint spraying aluminum product containing the fluorocarbon composite film is provided, and the composite film interlayer of the paint spraying aluminum product has larger surface area, uniform and irregular geometric shape, so that the binding force between paint and an oxide film layer is increased, the paint film adhesion is strong, and the service life of the product is prolonged.
The second technical problem to be solved by the invention is: aiming at the defects in the prior art, the surface treatment method of the paint spraying aluminum product containing the fluorocarbon composite film is provided, the treatment method has short process flow, the treatment liquid can be recycled without replacement, a large amount of water and chemical raw materials are saved, and the product performance is better.
In order to solve the first technical problem, the technical scheme of the invention is as follows:
a paint spraying aluminum product containing a fluorocarbon composite film is characterized in that the surface of the aluminum product and the low-lying part of the aluminum product profile are covered with a layer of fluorocarbon composite film; the fluorocarbon composite film is a composite film containing O, Al, C and F components; the fluorocarbon composite film is covered with a fluorocarbon paint film.
As an improved technical scheme, the fluorocarbon composite membrane is a composite membrane containing aluminum oxalate, aluminum fluoride, sodium aluminum hexafluoride and aluminum oxide.
As an improved technical scheme, the thickness of the fluorocarbon composite film is 0.5-6 microns.
As an improved technical scheme, the fluorocarbon composite film is a uniform honeycomb-shaped film.
In order to solve the second technical problem, the technical solution of the present invention is:
the surface treatment method of the paint spraying aluminum product containing the fluorocarbon composite film comprises the following steps:
(1) oil removal and polishing: placing the aluminum product to be treated in an oil removal polishing solution, reacting until bubbles emerge from the treatment solution, then continuing to soak and react for 1-10 min, and covering a uniform composite salt film protective layer on the surface of the aluminum product and the low-lying part of the profile;
(2) electrolytic oxidation: placing the degreased and polished aluminum product in electrolytic oxidation liquid without washing, and electrolytically oxidizing the aluminum product into a layer of fluorine-containing oxide film; in the electrolytic film forming process, the fluorine-containing oxide film and the composite salt film protective layer are compounded into a fluorocarbon composite film; the current density during electrolysis is 1.2-7A/dm2(ii) a The electrolysis time of the electrolysis is 1-5 min;
(3) painting: and washing and drying the aluminum product subjected to electrolytic oxidation or dripping and drying the aluminum product and then performing paint spraying treatment to form a fluorocarbon paint film on the fluorine-containing oxide film.
As an improved technical scheme, the oil removing polishing solution comprises the following components: 5-30 g/L oxalic acid, 0.5-4 g/L ammonium bifluoride, 0.003-0.008 g/L surfactant and 0.05-0.15 g/L auxiliary agent.
As a preferred technical scheme, the surfactant comprises one or more of alkylphenol polyoxyethylene, octylphenol polyoxyethylene, nonylphenol polyoxyethylene, glycerol fatty acid ester and sorbitan fatty acid ester; the auxiliary agent comprises sodium salt: one or more of sodium nitrite, sodium oxalate, sodium fluoride, sodium carbonate and sodium sulfate.
In the process of degreasing and polishing aluminum profiles, grease enters the treatment liquid, a transparent fiber with the specific gravity less than 1 and the thickness of about 30mm is generated under the combined action of oxalic acid, fluoride ions, an ammonia ion surfactant, an oxidation assistant and the like, the main component is polyamide, and the fiber tank liquid is regularly filtered out so that the fiber tank liquid cannot be updated and replaced due to the increase of the concentration of the grease. The foreign impurities are precipitated (with extremely small quantity) every year, and the foreign impurities are removed by inverting the tank. The invention has no pollution when no discharge exists, and the invention is different from the prior art in that the tank liquor does not need to be replaced and updated, and the flocculent fiber polymerized by grease can be removed by regular filtration, thereby ensuring the limpidity and sustainable reuse of the tank liquor and solving the problem of environmental protection.
As an improved technical scheme, the electrolytic oxidation solution contains the following components: 0.5-1.5 g/L ammonium hydrogen fluoride and 10-60 g/L oxalic acid.
The existence of F ions in the electrolytic oxidation liquid reduces the chemical energy of AI, so that AI can be generated more easily3+’The concentration of oxalic acid is about 30 times of that of ammonium hydrogen fluoride, and AI is ensured3+Can produce aluminum oxalate and participate in film formation. The F ion also acts as a catalyst during the reaction.
As an improved technical scheme, Al in the electrolytic oxidation solution3+The equilibrium concentration is less than 1 g/L.
As an improved technical scheme, the electrolysis temperature during electrolysis is less than or equal to 29 ℃.
As an improved technical scheme, when the solvent-based paint is used in the paint spraying treatment, the water washing and drying are needed; the water-soluble paint does not need to be washed and dried, and the paint spraying treatment can be carried out only after dripping.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the surface pretreatment of the aluminum product is carried out, firstly, degreasing polishing solution is adopted, oil stain on the surface of the aluminum product can be removed by natural oxidation, fluoride ions, aluminum oxide on the surface of the aluminum profile and aluminum ions generated by the aluminum are captured by oxalic acid and precipitated on the low-lying position on the surface of the aluminum profile, mechanical lines of the aluminum profile are filled, a layer of composite protective film of aluminum oxalate, aluminum oxide and aluminum fluoride is formed on the surface of the aluminum profile, and the corrosion resistance, pollution resistance and surface bonding capability of the aluminum profile are improved by oxidation treatment, so that the aluminum product can obtain good corrosion resistance without primer when being painted; the aluminum product with the composite salt film protective layer is subjected to electrolytic oxidation film formation in electrolytic oxidation liquid, an organic inorganic fluorine-containing oxidation film is generated through electrolysis, and SEM + EDS detection and analysis show that the oxidation film has uniform and irregular shapes, and the oxidation film and a paint layer can generate good adhesive force, so that the problem that under-film corrosion is easy to generate between the organic film and the product is solved greatly, the performance index of the product is improved, and the service life of the product is prolonged. The invention finishes oil removal and polishing in one step, simplifies the steps, saves the water washing step between each step in the prior art, and saves a large amount of water because ofThe concentration of aluminum ions in the electrolytic oxidation liquid is generally about 0.1g/L to generate ionization balance, the concentration of the aluminum ions is not increased any more, so the oxidation liquid does not need to be replaced and can be recycled, thereby compared with the prior art, the solid waste is reduced, and less Al is discharged when 5000 tons of section bars are produced3+About 50 tons, reduce the discharge amount of waste water by more than 80%, and reduce solid waste and dangerous waste by more than 90%.
The product quality of the invention is superior to the GB/T5237.5 performance in the prior art. The weight of a chemical conversion film before paint spraying in the prior art is less than or equal to 200mg/m2In addition, the chromium-free passivation corrosion resistance is general, the thickness of a formed film before spray painting is about 2 mu m, the detection and the control are easy, the optimal shape state which is easily and firmly combined with the paint film can be obtained, and the diffusion process of the corrosion under the film is effectively blocked.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 shows the current density of the present invention at 2.5A/dm2Electrolyzing the fluorocarbon composite film formed for 5min to obtain a surface topography map amplified by eighty thousand times;
FIG. 2 shows the current density of the present invention at 2.5A/dm2Electrolyzing the fluorocarbon composite film formed for 5min to obtain a surface topography map amplified by fifty thousand times;
FIG. 3 shows the current density of the present invention at 3.5A/dm2Electrolyzing the fluorocarbon composite film formed for 2min to obtain a surface topography map amplified by one hundred thousand times;
FIG. 4 shows the current density of the present invention at 3.5A/dm2Electrolyzing the fluorocarbon composite film formed for 2min to obtain a surface topography map amplified by fifty thousand times;
FIG. 5 shows the current density of the present invention at 3.5A/dm2Electrolyzing the fluorocarbon composite film formed for 4min to obtain a surface topography map amplified by eighty thousand times;
FIG. 6 shows the current density of the present invention at 3.5A/dm2Electrolyzing the fluorocarbon composite film formed for 4min to obtain a surface topography map amplified by fifty thousand times;
FIG. 7 is a graph showing the appearance of an oxide film formed by a sulfuric acid process in the background art.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in the figures 1 and 6, the fluorocarbon composite film formed by the aluminum product by the degreasing and polishing and then the electrolytic oxidation method has a uniform and irregular appearance, has a large surface area when being combined with a paint film, can obtain the maximum oxide film-paint film bonding force, improves the adhesive force and the performances of impact resistance, alkali resistance and salt mist resistance, and can effectively solve the corrosion defect under the film. FIG. 7 shows that the film formed by sulfuric acid oxidation in the background art has no uniform irregular morphology, and the oxide film has poor binding force with the paint film and is not corrosion-resistant.
Example 1
A paint spraying aluminum product containing a fluorocarbon composite film is characterized in that the surface of the aluminum product and the low-lying part of the aluminum product profile are covered with a layer of fluorocarbon composite film; the fluorocarbon composite film is a composite film containing aluminum oxalate, aluminum fluoride, sodium aluminum hexafluoride and aluminum oxide; the thickness of the fluorocarbon composite film is 1.5 mu m; the fluorocarbon composite film is uniform and irregular in shape and is shown in the attached drawing; and a paint film is covered on the fluorocarbon composite film.
Example 2
A paint spraying aluminum product containing a fluorocarbon composite film is characterized in that the surface of the aluminum product and the low-lying part of the aluminum product profile are covered with a layer of fluorocarbon composite film; the fluorocarbon composite film is a composite film containing aluminum oxalate, aluminum fluoride, sodium aluminum hexafluoride and aluminum oxide; the thickness of the fluorocarbon composite film is 3 mu m; the fluorocarbon composite film is uniform and irregular in shape and is shown in the attached drawing; and a paint film is covered on the fluorocarbon composite film.
Example 3
A paint spraying aluminum product containing a fluorocarbon composite film is characterized in that the surface of the aluminum product and the low-lying part of the aluminum product profile are covered with a layer of fluorocarbon composite film; the fluorocarbon composite film is a composite film containing aluminum oxalate, aluminum fluoride, sodium aluminum hexafluoride and aluminum oxide; the thickness of the fluorocarbon composite film is 3.5 mu m; the fluorocarbon composite film is uniform and irregular in shape and is shown in the attached drawing; and a paint film is covered on the fluorocarbon composite film.
Example 4
(1) Oil removal and polishing: placing an aluminum product to be treated in an oil-removing polishing solution containing 12g/L oxalic acid, 2g/L ammonium bifluoride, 0.005g/L surfactant alkylphenol polyoxyethylene ether and 0.09g/L auxiliary agent sodium nitrite, reacting until bubbles emerge from the treatment solution, continuing to soak for reaction for 5min, and covering a layer of uniform composite salt film protective layer on the surface of the aluminum product and the low-lying part of the profile.
(2) Electrolytic oxidation: placing the degreased and polished aluminum product in electrolytic oxidation liquid containing 1.2g/L ammonium hydrogen fluoride and 30g/L oxalic acid without washing with water, and electrolytically oxidizing the aluminum product into a layer of fluorine-containing oxide film; in the electrolytic film forming process, the fluorine-containing oxide film and the composite salt film protective layer are compounded into a fluorocarbon composite film with the thickness of 2.5 microns; the current density during electrolysis is 3.5A/dm2(ii) a Al in the oxidizing solution3+The equilibrium concentration is 0.03 g/L; the electrolysis time of the electrolysis is 3 min; the electrolysis temperature was 23 ℃.
(3) Painting: after the aluminum product after electrolytic oxidation is dried by dripping, using water-soluble paint to carry out paint spraying treatment, and forming a paint film on the fluorine-containing oxide film; finally, curing is carried out for 30 min.
Example 5
(1) Oil removal and polishing: placing an aluminum product to be treated in an oil removing polishing solution containing 20g/L of oxalic acid, 1.5g/L of ammonium bifluoride, 0.006g/L of surfactant octylphenol polyoxyethylene ether and 0.10g/L of auxiliary agent sodium fluoride, reacting until bubbles emerge from the treatment solution, continuing to soak for reaction for 3min, and covering a layer of uniform composite salt film protective layer on the surface of the aluminum product and the low-lying part of the profile.
(2) Electrolytic oxidation: placing the degreased and polished aluminum product in electrolytic oxidation liquid containing 1.0g/L ammonium hydrogen fluoride and 45g/L oxalic acid without washing with water, and electrolytically oxidizing the aluminum product into a layer of fluorine-containing oxide film; in the electrolytic film forming process, the fluorine-containing oxide film and the composite salt film protective layer are compounded into a fluorocarbon composite film with the thickness of 3.6 microns; the electrolysisCurrent density of 3A/dm2(ii) a Al in the oxidizing solution3+The equilibrium concentration is 0.05 g/L; the electrolysis time of the electrolysis is 4 min; the electrolysis temperature was 18 ℃.
(3) Painting: washing the aluminum product subjected to electrolytic oxidation twice until the pH value is 6.5, drying, and performing spray painting treatment by using solvent paint to form a paint film on the fluorine-containing oxide film; finally, curing is carried out for 30 min.
Example 6
(1) Oil removal and polishing: placing an aluminum product to be treated in an oil removal polishing solution containing 15g/L of oxalic acid, 2.5g/L of ammonium bifluoride, 0.004g/L of surfactant glycerin fatty acid ester and 0.12g/L of auxiliary agent sodium carbonate, reacting until bubbles emerge from the treatment solution, continuing to soak for reaction for 7min, and covering a uniform composite salt film protective layer on the surface of the aluminum product and the low-lying part of the section.
(2) Electrolytic oxidation: placing the degreased and polished aluminum product in electrolytic oxidation liquid containing 1.3g/L ammonium hydrogen fluoride and 20g/L oxalic acid without washing with water, and electrolytically oxidizing the aluminum product into a layer of fluorine-containing oxide film; in the electrolytic film forming process, the fluorine-containing oxide film and the composite salt film protective layer are compounded into a fluorocarbon composite film with the thickness of 2.2 mu m; the current density during electrolysis is 2.5A/dm2(ii) a Al in the oxidizing solution3+The equilibrium concentration is 0.02 g/L; the electrolysis time of the electrolysis is 2 min; the electrolysis temperature was 26 ℃.
(3) Painting: washing the aluminum product after electrolytic oxidation with water twice until the pH value is 6, and then drying the aluminum product for 3min at 105 ℃; or after dripping dry, performing paint spraying treatment by using water-soluble paint to form a paint film on the fluorine-containing oxide film; finally, the mixture enters a curing furnace to be cured for 25min at the temperature of 210 ℃.
Claims (10)
1. The paint spraying aluminum product containing the fluorocarbon composite film is characterized in that: a layer of fluorocarbon composite film covers the surface of the aluminum product and the low-lying part of the aluminum product section; the fluorocarbon composite film is a composite film containing O, Al, C and F components; the fluorocarbon composite film is covered with a fluorocarbon paint film.
2. The painted aluminum article with fluorocarbon composite film of claim 1, wherein: the fluorocarbon composite membrane is a composite membrane containing aluminum oxalate, aluminum fluoride, sodium aluminum hexafluoride and aluminum oxide.
3. The painted aluminum article with fluorocarbon composite film of claim 1, wherein: the thickness of the fluorocarbon composite film is 0.5-6 mu m.
4. The painted aluminum article with fluorocarbon composite film of claim 1, wherein: the fluorocarbon composite film is a uniform film with irregular appearance.
5. The surface treatment method of a painted aluminum article containing a fluorocarbon composite film as claimed in claim 1, comprising the steps of:
(1) oil removal and polishing: placing the aluminum product to be treated in an oil removal polishing solution, reacting until bubbles emerge from the treatment solution, then continuing to soak and react for 1-10 min, and covering a uniform composite salt film protective layer on the surface of the aluminum product and the low-lying part of the profile;
(2) electrolytic oxidation: placing the degreased and polished aluminum product in electrolytic oxidation liquid without washing, and electrolytically oxidizing the aluminum product into a layer of fluorine-containing oxide film; in the electrolytic film forming process, the fluorine-containing oxide film and the composite salt film protective layer are compounded into a fluorocarbon composite film; the current density during electrolysis is 1.2-7A/dm2(ii) a The electrolysis time of the electrolysis is 1-5 min;
(3) painting: and washing and drying the aluminum product subjected to electrolytic oxidation or dripping and drying the aluminum product and then performing paint spraying treatment to form a fluorocarbon paint film on the fluorocarbon composite film.
6. The method for treating the surface of a painted aluminum article with fluorocarbon composite film as claimed in claim 1, wherein the oil-removing polishing liquid comprises the following components: 5-30 g/L oxalic acid, 0.5-4 g/L ammonium bifluoride, 0.003-0.008 g/L surfactant and 0.05-0.15 g/L auxiliary agent.
7. The surface treatment method of a painted aluminum article containing a fluorocarbon composite film as claimed in claim 6, wherein: the surfactant comprises one or more of alkylphenol polyoxyethylene, octylphenol polyoxyethylene, nonylphenol polyoxyethylene, glycerin fatty acid ester and sorbitan fatty acid ester; the auxiliary agent comprises sodium salt: one or more of sodium nitrite, sodium oxalate, sodium fluoride, sodium carbonate and sodium sulfate.
8. The method for treating the surface of a painted aluminum product containing a fluorocarbon composite film as claimed in claim 5, wherein the electrolytic oxidation solution contains the following components: 0.5-1.5 g/L of ammonium hydrogen fluoride and 10-60 g/L of oxalic acid; al in the electrolytic oxidation solution3+The equilibrium concentration is less than 1 g/L.
9. The surface treatment method of a painted aluminum article containing a fluorocarbon composite film as claimed in claim 5, wherein: the electrolysis temperature during electrolysis is less than or equal to 29 ℃.
10. The surface treatment method of a painted aluminum article containing a fluorocarbon composite film as claimed in claim 5, wherein: when the solvent paint is used in the paint spraying treatment, the solvent paint needs to be washed and dried; the water-soluble paint does not need to be washed and dried, and the paint spraying treatment can be carried out only after dripping.
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| CN202010278140.0A CN111379000A (en) | 2020-04-10 | 2020-04-10 | Paint-sprayed aluminum product containing fluorocarbon composite film and surface treatment method thereof |
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| CN202010278140.0A CN111379000A (en) | 2020-04-10 | 2020-04-10 | Paint-sprayed aluminum product containing fluorocarbon composite film and surface treatment method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875395A (en) * | 2022-03-31 | 2022-08-09 | 潍坊国一铝材有限公司 | Electrophoretic galvanized iron product and surface treatment method thereof |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875395A (en) * | 2022-03-31 | 2022-08-09 | 潍坊国一铝材有限公司 | Electrophoretic galvanized iron product and surface treatment method thereof |
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