CN111519176A - Aluminum alloy chemical conversion film forming solution and preparation method of conversion film - Google Patents
Aluminum alloy chemical conversion film forming solution and preparation method of conversion film Download PDFInfo
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- CN111519176A CN111519176A CN202010414921.8A CN202010414921A CN111519176A CN 111519176 A CN111519176 A CN 111519176A CN 202010414921 A CN202010414921 A CN 202010414921A CN 111519176 A CN111519176 A CN 111519176A
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- 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
- C23C22/40—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 molybdates, tungstates or vanadates
- C23C22/44—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 molybdates, tungstates or vanadates containing also fluorides or complex fluorides
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- 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
- C23C22/78—Pretreatment of the material to be coated
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- 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
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- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/32—Alkaline compositions
- C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
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- 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
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
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Abstract
The invention discloses an aluminum alloy chemical conversion film-forming solution, which comprises the following components: 5-15 g/L of lanthanum salt; 1-10 g/L of molybdate; 50-200 mL/L of hydrogen peroxide; 0.1-0.5 g/L of film forming accelerant; 0.1-0.5 g/L of polyvinyl alcohol; 5-30 g/L of pH regulator; the balance of water; the pH value of the chemical conversion film-forming solution is 2-6. The preparation method of the chemical conversion coating comprises the steps of polishing, oil removal, microetching liquid treatment, activating liquid treatment, film forming treatment and drying. The method has simple process, and the prepared chemical conversion film is compact and has excellent corrosion resistance and hydrophilicity.
Description
Technical Field
The invention relates to the technical field of aluminum alloy surface anti-corrosion treatment, in particular to an aluminum alloy chemical conversion film-forming solution and a preparation method of a conversion film.
Background
The aluminum alloy has high strength and good mechanical property, although an oxide film formed on the surface has certain corrosion resistance, the corrosion resistance is limited, and the bonding force between a natural oxide film and a surface functional coating is low, so that the aluminum material needs to be subjected to effective corrosion prevention treatment. In the prior art, anodic oxidation, micro-arc oxidation, metal coating, chemical conversion coating and the like are generally adopted to protect the aluminum alloy.
However, cracks, peeling and the like exist in the surface coating, so that the inner layer aluminum alloy is subjected to electrochemical reaction when exposed in a corrosive medium, the metal structure is further damaged, the performance of the metal structure is influenced, and finally the corrosion resistance of the alloy is greatly reduced. The local corrosion of common aluminum alloys mainly includes: pitting corrosion, intergranular corrosion, galvanic corrosion, crevice corrosion, filiform corrosion, lamellar corrosion, etc. Compared with general corrosion, the local corrosion has the characteristics of strong concealment, difficult control, rapid damage and the like. Therefore, in order to improve the corrosion resistance and prolong the service life of the aluminum alloy, it is necessary to form a dense protective coating.
The protective coating with excellent corrosion resistance can be obtained by the film forming treatment of the chemical conversion film-forming liquid on the aluminum alloy. The prior art has made a great deal of research into the chemical conversion of aluminum alloy surfaces into films, however, the application of aluminum alloy articles in different environments requires other properties besides corrosion protection, such as hydrophilicity. Although the preparation of hydrophilic coatings is also contemplated. However, few studies have been made on how to prepare a chemical conversion coating of an aluminum alloy having corrosion resistance and hydrophilicity.
Disclosure of Invention
Aiming at the requirements of the prior art, the invention provides an aluminum alloy chemical conversion film-forming solution and a preparation method of a chemical conversion film, and the prepared chemical conversion film is compact and has excellent corrosion resistance and hydrophilicity.
In order to solve the above problems, one of the technical solutions provided by the present invention is as follows: an aluminum alloy chemical conversion deposition solution, comprising:
5-15 g/L of lanthanum salt;
1-10 g/L of molybdate;
50-200 mL/L of hydrogen peroxide;
0.1-0.5 g/L of film forming accelerant;
0.1-0.5 g/L of polyvinyl alcohol;
5-30 g/L of pH regulator;
the balance of water;
the pH value of the chemical conversion film-forming solution is 2-6.
Further, the chemical conversion deposition solution comprises:
8-12 g/L of lanthanum salt;
3-7 g/L of molybdate;
80-150 mL/L of hydrogen peroxide;
0.2-0.4 g/L of film forming accelerant;
0.2-0.4 g/L of polyvinyl alcohol;
10-20 g/L of pH regulator;
the balance of water;
the pH value of the chemical conversion film-forming solution is 3-5.
Further, the lanthanum salt is selected from one or more of lanthanum nitrate and lanthanum chloride.
Further, the molybdate is selected from one or more of sodium molybdate and potassium molybdate.
Further, the film forming accelerant is selected from one or more of sodium fluoride and potassium fluoride.
Further, the pH regulator is selected from one or more of nitric acid and sulfuric acid.
In order to solve the above problems, the second technical solution provided by the present invention is as follows: a preparation method of an aluminum alloy chemical conversion film-forming solution comprises the following steps:
(1) using 800 aluminum alloy#、1000#、2000#Sanding with sand paper, and cleaning with running water.
(2) And (3) placing the aluminum alloy in a degreasing agent to remove oil, and then cleaning with running water.
(3) And (3) placing the aluminum alloy in a microetching solution for treatment, and then cleaning with running water.
(4) The aluminum alloy is treated in activating liquid and then washed by running water.
(5) Placing the aluminum alloy in the chemical conversion film-forming solution for treatment, and then cleaning with running water; the temperature of the chemical conversion film forming liquid is 50-90 ℃, the processing time is 10-20 min, and the thickness of the chemical conversion film is 3-10 mu m. (6) Drying in an oven at 40-70 ℃ for 5-10 min.
Further, the oil removing agent in the step (2) is composed of 10-20 g/L sodium phosphate, 5-10 g/L sodium bicarbonate, 0.1-0.5 g/L sodium dodecyl benzene sulfonate and the balance of water. The temperature of the degreasing agent is 40-60 ℃, and the degreasing time is 5-10 min.
Further, the micro-etching solution in the step (3) is composed of 30-50 g/L of sodium hydroxide, 10-20 g/L of sodium citrate, 1-5 g/L of glycerol, 0.5-1 g/L of thiourea and the balance of water. The microetching treatment temperature is 40-50 ℃, and the microetching treatment time is 1-5 min. The surface roughness Ra of the aluminum alloy after the micro-etching is 1-5 mu m.
Further, the activating solution in the step (4) is composed of 50-100 mL/L hydrochloric acid, 20-30 g/L acetic acid and the balance of water. The activation temperature is 20-30 ℃ and the activation time is 1-3 min.
According to the invention, the aluminum alloy substrate is immersed into the micro-etching solution to roughen the surface of the aluminum alloy, so that a certain roughness is obtained, the binding force between the aluminum alloy and the chemical conversion film is further improved, and the falling-off of the conversion film can be effectively avoided.
The functions of the components of the chemical conversion deposition solution and the deposition principle of the present invention are explained below.
The aluminum alloy matrix is soaked in the acidic chemical conversion film-forming solution, and the main reaction is as follows: al → Al3++e-，
Hydrolysis of lanthanum salt to La3+Lanthanum conversion coating through La3+The ions precipitate as lanthanum hydroxide or lanthanum oxide. Will comprise MoO4 2+And the addition of polyvinyl alcohol can improve the film forming performance of the conversion film. MoO4 2+Is present so that mainly molybdenum oxide is deposited on the cathode site at an earlier stage of the immersion time. And the polyvinyl alcohol contains a large amount of hydroxyl, and the hydroxyl is easily adsorbed to the anode part, so that the dissolving speed of the aluminum alloy is reduced, and the deposition rate of a lanthanum conversion film is also inhibited.
In addition, polyvinyl alcohol also includes a number of oxygen-containing groups, so that polyvinyl alcohol-manganese, polyvinyl alcohol-lanthanum complexes are also formed in the chemical conversion. The complex can be converted into polyvinyl alcohol-manganese, polyvinyl alcohol-lanthanum and polyvinyl alcohol-lanthanum-molybdenum complexes at the anode part of the surface of the aluminum alloy through cation exchange reaction. Polyvinyl alcohol-manganese, polyvinyl alcohol-lanthanum complex, polyvinyl alcohol-lanthanum-molybdenum complex coating cathode by forming hydroxide and oxide and partially unconverted complexThe passage of oxygen and corrosive substances into the intermetallic compound is provided. Thus, MoO4 2+And the addition of polyvinyl alcohol results in an increase in the thickness of the converted film and a reduction in the microcracks of the converted film.
Polyvinyl alcohol existing in the chemical conversion coating film can be adsorbed at the anode part in a corrosive medium, so that the contact between the corrosive medium and the aluminum alloy is avoided, the anode reaction speed is limited, and the corrosion resistance of the aluminum alloy is further improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) the preparation process is simple, and the prepared chemical conversion film has strong binding force and compact surface appearance, can effectively prevent the aluminum alloy from being corroded in corrosive media, and prolongs the service life of the aluminum alloy.
(2) The chemical conversion film prepared by the invention has good hydrophilicity, and can be widely applied to the fields of radiating fins and the like.
Drawings
FIG. 1 is a scanning electron micrograph of a chemical conversion coating prepared according to an example of the present invention and a comparative example.
FIG. 2 is a polarization curve of a chemical conversion film prepared in examples of the present invention and comparative examples.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
Example 1
Lanthanum nitrate 8g/L, sodium molybdate 3g/L, hydrogen peroxide 80mL/L, sodium fluoride 0.2g/L, polyvinyl alcohol 0.2g/L, sulfuric acid 18.8g/L, and the balance of water; the pH of the chemical conversion film-forming solution is 5.3.
A preparation method of an aluminum alloy chemical conversion film-forming solution comprises the following steps: (1) using 800 aluminum alloy#、1000#、2000#Sanding with sand paper, and cleaning with running water.
(2) And (3) placing the aluminum alloy in a degreasing agent to remove oil, and then cleaning with running water. The degreasing agent consists of 15g/L sodium phosphate, 5g/L sodium bicarbonate, 0.2g/L sodium dodecyl benzene sulfonate and the balance of water. The temperature of the degreasing agent is 40 ℃, and the degreasing time is 10 min.
(3) And (3) placing the aluminum alloy in a microetching solution for treatment, and then cleaning with running water. The microetching solution consists of 35g/L of sodium hydroxide, 15g/L of sodium citrate, 5g/L of glycerol, 0.6g/L of thiourea and the balance of water. The microetching treatment temperature is 50 ℃ and the microetching treatment time is 1 min. The surface roughness Ra of the aluminum alloy after the micro-etching is 1.7 mu m.
(4) The aluminum alloy is treated in activating liquid and then washed by running water. The activating solution consists of 50mL/L hydrochloric acid, 30g/L acetic acid and the balance of water. The activation temperature is 20 deg.C, and the activation time is 1 min.
(5) Placing the aluminum alloy in the chemical conversion film-forming solution for treatment, and then cleaning with running water; the temperature of the chemical conversion coating liquid is 80 ℃, the processing time is 10min, and the thickness of the chemical conversion coating is 5.6 mu m.
(6) Drying in oven at 45 deg.C for 5 min.
Example 2
10g/L lanthanum chloride, 5g/L potassium molybdate, 120mL/L hydrogen peroxide, 0.3g/L potassium fluoride, 0.4g/L polyvinyl alcohol, 15.4g/L nitric acid and the balance of water; the pH of the chemical conversion film-forming solution is 3.8.
A preparation method of an aluminum alloy chemical conversion film-forming solution comprises the following steps: (1) using 800 aluminum alloy#、1000#、2000#Sanding with sand paper, and cleaning with running water.
(2) And (3) placing the aluminum alloy in a degreasing agent to remove oil, and then cleaning with running water. The degreasing agent consists of 20g/L sodium phosphate, 10g/L sodium bicarbonate, 0.1g/L sodium dodecyl benzene sulfonate and the balance of water. The temperature of the degreasing agent is 40 ℃, and the degreasing time is 10 min.
(3) And (3) placing the aluminum alloy in a microetching solution for treatment, and then cleaning with running water. The microetching solution consists of 30g/L of sodium hydroxide, 10g/L of sodium citrate, 2g/L of glycerol, 0.8g/L of thiourea and the balance of water. The microetching treatment temperature is 45 ℃ and the microetching treatment time is 4 min. The surface roughness Ra of the aluminum alloy after the micro-etching is 2.5 mu m.
(4) The aluminum alloy is treated in activating liquid and then washed by running water. The activating solution consists of 80mL/L hydrochloric acid, 20g/L acetic acid and the balance of water. The activation temperature is 25 deg.C, and the activation time is 3 min.
(5) Placing the aluminum alloy in the chemical conversion film-forming solution for treatment, and then cleaning with running water; the temperature of the chemical conversion coating liquid is 70 ℃, the processing time is 20min, and the thickness of the chemical conversion coating is 8.4 mu m.
(6) Drying in an oven at 60 deg.C for 10 min.
Example 3
12g/L lanthanum nitrate, 7g/L potassium molybdate, 150mL/L hydrogen peroxide, 0.4g/L sodium fluoride, 0.4g/L polyvinyl alcohol, 20.4g/L nitric acid and the balance of water; the pH of the chemical conversion film-forming solution was 3.1.
A preparation method of an aluminum alloy chemical conversion film-forming solution comprises the following steps: (1) using 800 aluminum alloy#、1000#、2000#Sanding with sand paper, and cleaning with running water.
(2) And (3) placing the aluminum alloy in a degreasing agent to remove oil, and then cleaning with running water. The degreasing agent consists of 10g/L sodium phosphate, 10g/L sodium bicarbonate, 0.4g/L sodium dodecyl benzene sulfonate and the balance of water. The temperature of the degreasing agent is 60 ℃, and the degreasing time is 5 min.
(3) And (3) placing the aluminum alloy in a microetching solution for treatment, and then cleaning with running water. The microetching solution consists of 50g/L of sodium hydroxide, 20g/L of sodium citrate, 5g/L of glycerol, 1g/L of thiourea and the balance of water. The microetching treatment temperature is 50 ℃ and the microetching treatment time is 2 min. The surface roughness Ra of the aluminum alloy after the micro-etching is 3.9 mu m.
(4) The aluminum alloy is treated in activating liquid and then washed by running water. The activating solution consists of 100mL/L hydrochloric acid, 30g/L acetic acid and the balance of water. The activation temperature is 30 deg.C, and the activation time is 2 min.
(5) Placing the aluminum alloy in the chemical conversion film-forming solution for treatment, and then cleaning with running water; the temperature of the chemical conversion coating liquid is 90 ℃, the processing time is 12min, and the thickness of the chemical conversion coating is 8.8 mu m.
(6) Drying in 70 deg.C oven for 5 min.
Comparative example 1
The experimental conditions of comparative example 1 were substantially the same as those of example 1 except that the chemical conversion coating solution of comparative example 1 did not contain molybdate.
Comparative example 2
The experimental conditions of comparative example 2 were substantially the same as those of example 2 except that the chemical conversion coating solution of comparative example 2 did not contain polyvinyl alcohol.
Comparative example 3
The experimental conditions of comparative example 3 were substantially the same as those of example 3 except that the chemical conversion coating solution of comparative example 3 did not contain molybdate and polyvinyl alcohol.
Performance testing
1. And observing the microscopic morphology of the chemical conversion film by using a scanning electron microscope. 1-6 in the figure 1 correspond to the shapes of examples 1-3 and comparative examples 1-6 respectively, and as can be seen from the figure, the chemical conversion film prepared by the method has a compact surface shape; comparative examples 1 to 3, however, exhibited poor morphology and exhibited cracks, and comparative example 3 exhibited more cracks than comparative examples 1 to 2 in width and number.
The reasons for this are: MoO4 2+The addition of the polyvinyl alcohol is beneficial to reducing the microcracks of the conversion film, so that a compact conversion film is formed.
2. Contact angle test: the chemical conversion films prepared in examples 1 to 3 and comparative examples 1 to 3 were tested by a contact angle measuring instrument. The contact angles are reported in table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Contact angle | 52.7 | 48.9 | 50.5 | 70.3 | 68.8 | 76.1 |
From the contact angle test data, the chemical conversion film prepared by the invention is hydrophilic coating. Lanthanide chemical conversion films on aluminum alloy surfaces result in an increase in surface free energy and a decrease in contact angle. The addition of molybdate and polyvinyl alcohol simultaneously leads to a surface chemical conversion film with higher contact angle and lower hydrophilicity.
3. And carrying out electrochemical test on the prepared chemical conversion film, wherein the test is carried out according to a three-electrode system, the aluminum alloy covered with the chemical conversion film is used as a working electrode, a platinum sheet is used as a counter electrode, and Ag/AgCl is used as a reference electrode. For the polarization test, only 1.0cm was left for the epoxy encapsulation2The test medium is a 3.5 wt% NaCl solution.
FIGS. 2 show polarization curves 1 to 6 corresponding to examples 1 to 3 and comparative examples 1 to 3, respectively. The corrosion current and corrosion potential were obtained by fitting, and the results are recorded in table 2.
TABLE 2
As can be seen from FIG. 2 and Table 2, the chemical conversion coatings prepared in examples 1 to 3 of the present invention are corrected in corrosion potential; on the other hand, the magnitude of the corrosion current density is somewhat representative of the corrosion rate, and it can be seen by comparison that the corrosion current densities of examples 1 to 3 are all smaller than those of comparative examples 1 to 3. Therefore, the chemical conversion film prepared by the invention has good corrosion resistance. Meanwhile, the addition of molybdate and/or polyvinyl alcohol can improve the performance of the aluminum alloy chemical conversion film-forming solution.
The present invention is not intended to be limited to the embodiments described above, and all modifications, equivalents, and alternatives falling within the scope of the present invention are also encompassed by the present invention.
Claims (10)
1. An aluminum alloy chemical conversion film-forming solution, which is characterized by comprising:
5-15 g/L of lanthanum salt;
1-10 g/L of molybdate;
50-200 mL/L of hydrogen peroxide;
0.1-0.5 g/L of film forming accelerant;
0.1-0.5 g/L of polyvinyl alcohol;
5-30 g/L of pH regulator;
the balance of water;
the pH value of the chemical conversion film-forming solution is 2-6.
2. The aluminum alloy chemical conversion deposition solution according to claim 1, wherein the chemical conversion deposition solution comprises:
8-12 g/L of lanthanum salt;
3-7 g/L of molybdate;
80-150 mL/L of hydrogen peroxide;
0.2-0.4 g/L of film forming accelerant;
0.2-0.4 g/L of polyvinyl alcohol;
10-20 g/L of pH regulator;
the balance of water;
the pH value of the chemical conversion film-forming solution is 3-5.
3. The aluminum alloy chemical conversion deposition solution according to any one of claims 1 to 2, wherein the lanthanum salt is selected from one or more of lanthanum nitrate and lanthanum chloride.
4. The aluminum alloy chemical conversion deposition solution according to any one of claims 1 to 3, wherein the molybdate is one or more selected from sodium molybdate and potassium molybdate.
5. The aluminum alloy chemical conversion deposition solution according to any one of claims 1 to 4, wherein the film formation promoter is one or more selected from sodium fluoride and potassium fluoride.
6. The aluminum alloy chemical conversion deposition solution according to any one of claims 1 to 5, wherein the pH adjusting agent is one or more selected from nitric acid and sulfuric acid.
7. The preparation method of the aluminum alloy chemical conversion film-forming solution is characterized by comprising the following steps of:
(1) using 800 aluminum alloy#、1000#、2000#Sanding with sand paper, and cleaning with running water;
(2) placing the aluminum alloy in a degreasing agent to remove oil, and then cleaning with running water;
(3) placing the aluminum alloy in a microetching solution for treatment, and then cleaning with running water;
(4) treating the aluminum alloy in an activating solution, and then cleaning with running water;
(5) placing the aluminum alloy in the chemical conversion film-forming solution for treatment, and then cleaning with running water; the temperature of the chemical conversion film forming liquid is 50-90 ℃, and the processing time is 10-20 min; the thickness of the chemical conversion film is 3-10 mu m;
(6) drying in an oven at 40-70 ℃ for 5-10 min.
8. The method for preparing the aluminum alloy chemical conversion film-forming solution according to claim 7, wherein the oil removing agent in the step (2) comprises 10-20 g/L sodium phosphate, 5-10 g/L sodium bicarbonate, 0.1-0.5 g/L sodium dodecylbenzenesulfonate and the balance of water; the temperature of the degreasing agent is 40-60 ℃, and the degreasing time is 5-10 min.
9. The method for preparing the aluminum alloy chemical conversion film-forming solution according to any one of claims 7 to 8, wherein the microetching solution in the step (3) is composed of 30 to 50g/L of sodium hydroxide, 10 to 20g/L of sodium citrate, 1 to 5g/L of glycerol, 0.5 to 1g/L of thiourea and the balance of water; the microetching treatment temperature is 40-50 ℃, and the microetching treatment time is 1-5 min; the surface roughness Ra of the aluminum alloy after the micro-etching is 1-5 mu m.
10. The method for preparing an aluminum alloy chemical conversion deposition solution according to any one of claims 7 to 8, wherein the activation solution in the step (4) comprises 50 to 100mL/L hydrochloric acid, 20 to 30g/L acetic acid, and the balance of water; the activation temperature is 20-30 ℃ and the activation time is 1-3 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115216759A (en) * | 2022-07-09 | 2022-10-21 | 重庆理工大学 | Hydrophilic chemical conversion film forming liquid and aluminum alloy surface treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115216759A (en) * | 2022-07-09 | 2022-10-21 | 重庆理工大学 | Hydrophilic chemical conversion film forming liquid and aluminum alloy surface treatment method |
| CN115216759B (en) * | 2022-07-09 | 2024-02-23 | 重庆理工大学 | Hydrophilic chemical conversion film forming liquid and aluminum alloy surface treatment method |
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Application publication date: 20200811 |