CN114525564A - Aluminum alloy sulfuric acid anodic oxidation thick film method, electrolyte, preparation method and product - Google Patents
Aluminum alloy sulfuric acid anodic oxidation thick film method, electrolyte, preparation method and product Download PDFInfo
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 83
- 230000003647 oxidation Effects 0.000 title claims abstract description 66
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000003792 electrolyte Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000004140 cleaning Methods 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 14
- 238000007743 anodising Methods 0.000 claims description 12
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 239000011651 chromium Substances 0.000 claims description 9
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 229940117975 chromium trioxide Drugs 0.000 claims description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 6
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000012459 cleaning agent Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- -1 aluminum ions Chemical class 0.000 claims description 2
- 239000010407 anodic oxide Substances 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims 1
- 238000011112 process operation Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
-
- 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
- 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
-
- 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
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
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Abstract
The invention relates to the technical field of sulfuric acid anodic oxidation, and discloses a method for preparing an aluminum alloy sulfuric acid anodic oxidation thick film, electrolyte for the aluminum alloy sulfuric acid anodic oxidation thick film, a preparation method for an aluminum alloy product with the anodic oxidation thick film and the aluminum alloy product with the anodic oxidation thick film. The parameters of the anodic oxidation process in the invention are as follows: the electrolyte is 165-200g/L sulfuric acid solution; the temperature is 20-21 ℃; the voltage is 17-18V, the pressure rise time is 5min, and the holding time is 10-30 min; the current density is 1-3A/dm2. The anodized film prepared based on the anodic oxidation procedure is thick and has uniform thickness and good corrosion resistance, the service life of the sulfuric acid anode is prolonged, and the anode is enlargedThe application range of the aluminum alloy product of the extremely oxidized thick film is wide, the process operation of the preparation method is simple, the production period can be effectively shortened, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of sulfuric acid anodic oxidation, in particular to a method for preparing an aluminum alloy sulfuric acid anodic oxidation thick film, electrolyte for the aluminum alloy sulfuric acid anodic oxidation thick film, a preparation method for an aluminum alloy product with the anodic oxidation thick film and the aluminum alloy product with the anodic oxidation thick film.
Background
As is known, an oxide film can be naturally generated on the surface of the aluminum alloy in the atmosphere, but the oxide film is very thin, is usually 2-3 nm in thickness, and is very easy to damage.
In order to expand the application range and prolong the service life, the aluminum anodic oxidation process is widely adopted in industry to obviously improve and enhance the appearance and the service performance of the aluminum alloy. Among them, the sulfuric acid anodization of aluminum alloy is widely used because of the advantages of simple process operation, low production cost, high film transparency, good corrosion resistance, easy coloring, etc. At present, the thickness of an output film of an aluminum alloy sulfuric acid anodizing production line is only 3-15 mu m, the service life of the aluminum alloy part is short, and the application of the aluminum alloy part in the environment with high comprehensive performance requirements in the aerospace field is limited. Therefore, the development of the sulfuric acid anode with the thick film has important significance for expanding the application range and prolonging the service life of the sulfuric acid anode.
The hard anodizing process is a thick film anodizing process such as: "patent No. 201110199723.5; the invention provides an electrolyte and a method for hard anodizing of aluminum alloy, and the electrolyte is prepared from sulfuric acid, malonic acid, oxalic acid and glycerol.
Disclosure of Invention
The invention aims to break through the barriers in the prior art and provide a set of aluminum alloy anodic oxidation thick film technology different from the prior art, which comprises a method for preparing an aluminum alloy sulfuric acid anodic oxidation thick film, electrolyte for the aluminum alloy sulfuric acid anodic oxidation thick film, a preparation method for an aluminum alloy product with the anodic oxidation thick film and the aluminum alloy product with the anodic oxidation thick film. The prepared aluminum alloy product with the anodic oxidation thick film has good corrosion resistance and can be applied to environments with higher comprehensive performance requirements.
The invention provides a method for anodizing a thick film by aluminum alloy sulfuric acid, which is used for anodizing by taking an aluminum alloy piece as an anode and a lead plate as a cathode. The electrolyte for anodic oxidation is 165-200g/L sulfuric acid solution. The reaction temperature of anodic oxidation is 20-21 ℃. The voltage of anodic oxidation is 17-18V; boosting time is 5 min; the retention time is 10-30 min. The current density in the anodic oxidation process is 1-3A/dm2. And a stirring device is adopted in the anodic oxidation process to avoid local temperature rise.
Secondly, based on the method for anodizing the thick film by using the aluminum alloy sulfuric acid, the electrolyte for anodizing the thick film by using the aluminum alloy sulfuric acid provided by the invention is 165-200g/L sulfuric acid solution.
The sulfuric acid solution contains impurities for purity, but the concentration of the impurities in the sulfuric acid solution needs to be controlled in order to ensure the quality of the anodic oxidation. Wherein Cl is controlled with emphasis-The concentration of the chloride ion is less than or equal to 0.2g/L, Al3+The concentration of aluminum ions is less than or equal to 12 g/L.
Thirdly, based on the method for anodizing the thick film by using the aluminum alloy sulfuric acid, a preparation method of an aluminum alloy product with the anodized thick film is provided.
The invention provides a preparation method of an aluminum alloy product with an anodized thick film, which takes an aluminum alloy piece as an anode and a lead plate as a cathode. The preparation method comprises the following steps: pretreatment, anodic oxidation, cleaning after anodic oxidation, low-chromium hole sealing treatment and drying.
The pretreatment comprises the following steps: the method comprises the steps of manual cleaning, hanging, alkali cleaning, warm water cleaning, primary cold water cleaning, light deoxidation, secondary cold water cleaning and tertiary cold water cleaning. The pretreatment is carried out to remove the scale on the surface of the aluminum alloy member and to expose a fresh substrate on the surface of the aluminum alloy member.
The manual cleaning is performed by wiping with acetone.
During alkali cleaning, the cleaning solution is a Hangao aircraft material cleaning agent Turco 4215 NC-LT: 45-60 g/L; the temperature is 49-60 ℃; the time is 10-15 min.
When the warm water is washed, the temperature is 40-60 ℃; the time is 2-3 min.
The temperature is room temperature when the first cold water washing is carried out; the time is 2-3 min. When the water is washed for the first time by cold water, the water film is required to be checked to be continuously broken within 30s before the water film is qualified.
And during light deoxidation, the aluminum alloy part is subjected to light deoxidation by using a mixed solution of nitric acid and chromium trioxide. Wherein, the nitric acid: 75-105 g/L; chromium trioxide: 22.5-26.2 g/L. And during the light deoxidation, the corrosion rate is controlled to be 0.8-1.0 mils/s/h.
The temperature is room temperature during the secondary cold water washing; the time is 2-3 min.
When the water is washed for the third time, the temperature is room temperature; the time is 2-3 min. And when the water is washed for three times by cold water, the water film is required to be checked to be continuously broken within 30s before the water film is qualified.
The anodic oxidation is carried out on the aluminum alloy piece after the pretreatment by adopting an electrolyte containing a sulfuric acid solution; the reaction temperature is 20-21 ℃; the voltage is 17-18V; boosting time is 5 min; keeping for 10-30 min; the current density in the anodic oxidation process is 1-3A/dm2. And a stirring device is adopted in the anodic oxidation process to avoid local temperature rise.
And (3) cleaning after anodic oxidation, cleaning the anodized aluminum alloy piece after anodic oxidation, and performing low-chromium hole sealing treatment after checking that the water film is continuously broken within 30 s.
When the low-chromium hole sealing treatment is carried out, the aluminum alloy part is immersed into a chromic acid solution at the temperature of 91-96 ℃, and the hole sealing time is 8-12 min. The concentration of the chromic acid solution is more than or equal to 15.6g/L, and the PH value is 3.2-4.5. SiO in the chromic acid solution2As impurities exist, SiO needs to be controlled2The concentration of the (B) is less than or equal to 7 g/L.
And after hole sealing is finished, air is adopted to dry the aluminum alloy piece until the aluminum alloy piece is dried.
Fourthly, based on the preparation method of the third point, the aluminum alloy product with the anodic oxidation thick film is prepared, the film thickness of the aluminum alloy product is 20-35 μm, and the corrosion resistance is good.
The invention has the following beneficial effects:
(1) according to the method for preparing the aluminum alloy sulfuric acid anodic oxidation thick film, the anodic oxidation thick film can be prepared on the aluminum alloy part only by using the sulfuric acid solution as the electrolyte, and the aluminum alloy sulfuric acid anodic oxidation thick film has better corrosion resistance;
(2) according to the preparation method of the aluminum alloy product with the anodic oxidation thick film, the process operation of the preparation method is simple, the production period can be effectively shortened, and the production cost is reduced;
(3) the preparation method provided by the invention can be used for preparing the aluminum alloy product with the anodic oxidation thick film, the film thickness of which is 20-35 mu m, the corrosion resistance of which is good, the thickness of the anodized film is uniform, the service life of the sulfuric acid anode is prolonged, and the application range of the sulfuric acid anode can be expanded.
Drawings
FIG. 1 is a comparison of oxide film quality for a group of aluminum alloy products having anodized thick films according to example 4 of the present invention.
FIG. 2 is a graph showing the results of salt spray tests on a group of aluminum alloy products having anodized thick films in example 4 of this invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples. Various substitutions and alterations according to the general knowledge and conventional practice in the art are intended to be included within the scope of the present invention without departing from the technical spirit of the present invention as described above.
Example 1:
the embodiment provides an electrolyte for an aluminum alloy anode oxidation thick film, which is used for an aluminum alloy anode oxidation process. The electrolyte is sulfuric acid solution of 165-200 g/L. Further, in order to ensure the after-production of anodic oxidationQuality of the product, the content of impurities in the sulfuric acid solution needs to be controlled. With emphasis on Cl-The concentration of (b) is less than or equal to 0.2g/L, Al3+The concentration of the (B) is less than or equal to 12 g/L.
Example 2:
this example provides a method for anodizing a thick film of aluminum alloy with sulfuric acid based on example 1, in which an aluminum alloy member is used as an anode and a lead plate is used as a cathode to perform anodic oxidation.
Parameters of the anodic oxidation process: the electrolyte is 165-200g/L sulfuric acid solution; the temperature is 20-21 ℃; the voltage is 17-18V, the pressure rise time is 5min, and the holding time is 10-30 min; the current density is 1-3A/dm2. And a stirring device is adopted in the anodic oxidation process to avoid local temperature rise. The anodized film prepared based on the anodic oxidation procedure is a thick film, has uniform thickness and good corrosion resistance, improves the service life of the sulfuric acid anode, enlarges the application range of the aluminum alloy product of the anodic oxidation thick film, has simple process operation of the preparation method, can effectively shorten the production period and reduce the production cost.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
in this embodiment, on the basis of embodiment 2, a method for preparing an aluminum alloy product with an anodized thick film is provided, where 7075-T73X, which is a high-strength aluminum alloy material commonly used for aircraft structural members, is selected as an anode test piece, a lead plate is selected as a cathode, and the size of the anode test piece is 4 × 4 × 0.07in.
The preparation method comprises the following steps: pretreatment, anodic oxidation, cleaning after anodic oxidation, low-chromium hole sealing treatment and drying.
The pretreatment comprises the following steps: the method comprises the steps of manual cleaning, hanging, alkali cleaning, warm water cleaning, primary cold water cleaning, light deoxidation, secondary cold water cleaning and tertiary cold water cleaning. The purpose of the pretreatment is to remove scale on the surface of the aluminum alloy article and to expose a fresh substrate on the surface of the aluminum alloy article.
The manual cleaning is performed by wiping with acetone.
During alkali cleaning, the cleaning solution is a Hangao aircraft material cleaning agent Turco 4215 NC-LT: 45-60 g/L; the temperature is 49-60 ℃; the time is 10-15 min.
When the warm water is washed, the temperature is 40-60 ℃; the time is 2-3 min.
The temperature is room temperature during the first cold water washing; the time is 2-3 min. When the water is washed for the first time by cold water, the water film is required to be checked to be continuously broken within 30s before the water film is qualified.
And during light deoxidation, the aluminum alloy part is subjected to light deoxidation by using a mixed solution of nitric acid and chromium trioxide. Wherein, the nitric acid: 75-105 g/L; chromium trioxide: 22.5-26.2 g/L. And during the light deoxidation, the corrosion rate is controlled to be 0.8-1.0 mils/s/h.
The temperature is room temperature during the secondary cold water washing; the time is 2-3 min.
When the water is washed for the third time, the temperature is room temperature; the time is 2-3 min. During the third cold water washing, the water film is required to be checked to be continuously broken within 30s before the water film is qualified.
The anodic oxidation is carried out on the aluminum alloy piece after the pretreatment by adopting an electrolyte containing a sulfuric acid solution; the reaction temperature is 20-21 ℃; the voltage is 17-18V; boosting time is 5 min; keeping for 10-30 min; the current density in the anodic oxidation process is 1-3A/dm2. And a stirring device is adopted in the anodic oxidation process to avoid local temperature rise.
And (3) cleaning after anodic oxidation, cleaning the anodized aluminum alloy piece after anodic oxidation, and performing low-chromium hole sealing treatment after checking that the water film is continuously broken within 30 s.
When the low-chromium hole sealing treatment is carried out, the aluminum alloy part is immersed into a chromic acid solution at the temperature of 91-96 ℃, and the hole sealing time is 8-12 min. The concentration of the chromic acid solution is more than or equal to 15.6g/L, and the PH value is 3.2-4.5. SiO in the chromic acid solution2As impurities exist, SiO needs to be controlled2The concentration of the (B) is less than or equal to 7 g/L. And after hole sealing is finished, air is adopted to dry the aluminum alloy piece until the aluminum alloy piece is dried.
Example 4:
this example prepared an aluminum alloy product with an anodized thick film based on the preparation method described in example 3. The anodic oxide film with higher film thickness can be obtained in shorter time by controlling the process parameters such as the concentration of sulfuric acid solution, reaction temperature, voltage, boosting time, holding time and the like in the anodizing process. Three tests are carried out according to different voltages, boosting time, holding time and temperatures under the condition of 180g/L of sulfuric acid solution, firstly, a MINISTEST 740 type coating thickness gauge is adopted to measure the thickness of a film layer of an anodized aluminum alloy product, the result is shown in figure 1, and a salt spray test is carried out, and the result is shown in figure 2.
As shown in FIG. 1 and FIG. 2, the aluminum alloy product has a film thickness of 20 to 35 μm and good corrosion resistance.
It should be noted that when the preparation method described in example 3 is adopted, the anodic oxidation process is: the electrolyte is a sulfuric acid solution of 200 g/L; the temperature is 20-21 ℃; the voltage is 18V, the boosting time is 5min, and the holding time is 30 min; the current density is 1-3A/dm2In the process, the prepared aluminum alloy product has the film thickness of 35 mu m, and the oxide film is compact, uniform in thickness and good in corrosion resistance.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for anodizing a thick film by aluminum alloy sulfuric acid comprises the steps of carrying out anodic oxidation by taking an aluminum alloy piece as an anode and taking a lead plate as a cathode, wherein the electrolyte for anodic oxidation is a sulfuric acid solution with the concentration of 165-200 g/L; the temperature is 20-21 ℃; the voltage is 17-18V, the pressure rise time is 5min, and the holding time is 10-30 min; the current density is 1-3A/dm2。
2. The electrolyte for the aluminum alloy sulfuric acid anodized thick film is characterized by being a sulfuric acid solution of 165-200 g/L.
3. The electrolyte for the aluminum alloy sulfuric acid anodized thick film according to claim 2, wherein the concentration of chloride ions in the sulfuric acid solution is less than or equal to 0.2g/L, and the concentration of trivalent aluminum ions in the sulfuric acid solution is less than or equal to 12 g/L.
4. A preparation method of an aluminum alloy product with an anodic oxidation thick film comprises the steps of pretreatment, anodic oxidation, cleaning after the anodic oxidation, low-chromium hole sealing treatment and drying, and is characterized in that an aluminum alloy piece is used as an anode and a lead plate is used as a cathode during the anodic oxidation; the electrolyte for anodic oxidation is 165-200g/L sulfuric acid solution; the temperature is 20-21 ℃; the voltage is 17-18V, the pressure rise time is 5min, and the holding time is 10-30 min; the current density is 1-3A/dm2。
5. The method for preparing the aluminum alloy sulfuric acid anodized thick film according to claim 4, wherein the pre-treatment comprises: the method comprises the steps of manual cleaning, hanging, alkali cleaning, warm water cleaning, primary cold water cleaning, light deoxidation, secondary cold water cleaning and tertiary cold water cleaning.
6. The method for preparing the aluminum alloy sulfuric acid anodic oxide thick film according to claim 4, wherein the post-anodic oxidation cleaning is to perform post-anodic oxidation cleaning on the anodized aluminum alloy piece, and perform low-chromium hole sealing treatment after the water film is continuously broken within 30 s.
7. The method for preparing the aluminum alloy sulfuric acid anodic oxidation thick film according to claim 4, wherein in the low-chromium hole sealing treatment, the aluminum alloy part is immersed in a chromic acid solution at the temperature of 91-96 ℃, and the hole sealing time is 8-12 min.
8. The method for preparing the aluminum alloy sulfuric acid anodic oxidation thick film according to claim 7, wherein the concentration of the chromic acid solution is not less than 15.6g/L, and the PH is 3.2-4.5; SiO in the chromic acid solution2The concentration of the (B) is less than or equal to 7 g/L.
9. The method for preparing an aluminum alloy sulfuric acid anodized thick film according to any one of claims 4 to 8,
the manual cleaning adopts an acetone wiping method;
during alkali cleaning, the cleaning solution is a Hangao aircraft material cleaning agent Turco 4215 NC-LT: 45-60 g/L; the temperature is 49-60 ℃; the time is 10-15 min;
when the warm water is washed, the temperature is 40-60 ℃; the time is 2-3 min;
the temperature is room temperature when the first cold water washing is carried out; the time is 2-3 min;
during the light deoxidation, the mixed solution of nitric acid and chromium trioxide is adopted to carry out the light deoxidation on the aluminum alloy part; wherein, the nitric acid: 75-105 g/L; chromium trioxide: 22.5-26.2 g/L; during the light deoxidation, the corrosion rate is controlled to be 0.8-1.0 mils/s/h;
the temperature is room temperature during the secondary cold water washing; the time is 2-3 min;
when the water is washed for the third time, the temperature is room temperature; the time is 2-3 min.
10. An aluminum alloy product having an anodized thick film produced by the production method according to claim 4.
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Application publication date: 20220524 |