CN118207435A - Aluminum alloy for anodic oxidation and production process thereof - Google Patents
Aluminum alloy for anodic oxidation and production process thereof Download PDFInfo
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- CN118207435A CN118207435A CN202410244053.1A CN202410244053A CN118207435A CN 118207435 A CN118207435 A CN 118207435A CN 202410244053 A CN202410244053 A CN 202410244053A CN 118207435 A CN118207435 A CN 118207435A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 95
- 230000003647 oxidation Effects 0.000 title claims abstract description 41
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 85
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 85
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000001257 hydrogen Substances 0.000 claims abstract description 39
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 39
- 238000005266 casting Methods 0.000 claims abstract description 33
- 238000004512 die casting Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 238000007872 degassing Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 241000519995 Stachys sylvatica Species 0.000 abstract description 13
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- 239000010936 titanium Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
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- 230000002159 abnormal effect Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
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- 238000007667 floating Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
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- 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 description 1
- 239000007789 gas Substances 0.000 description 1
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- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
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- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The application relates to the technical field of aluminum alloy ingots, in particular to an aluminum alloy for anodic oxidation and a production process thereof. The production process comprises the following steps: smelting, namely smelting an aluminum alloy raw material to obtain an aluminum melt; the aluminum alloy raw materials comprise the following components in percentage by mass: 12-14% of Si, 0.5-1% of Fe, 0.03-0.1% of Cu, less than or equal to 0.5% of Mn, 0.1-0.8% of Mg, less than or equal to 0.1% of Cr, 0.01-0.05% of Zn, 0.01-0.05% of Ti, and the balance of aluminum and unavoidable impurities. Refining, and controlling the hydrogen content of the aluminum melt to be 0.25-0.35ml/100gAl. And removing hydrogen in the aluminum melt after online degassing and refining, so that the hydrogen content of the aluminum melt is less than or equal to 0.125ml/100gAl. Filtering on line, and filtering out solid slag in the aluminum melt after degassing. And (3) die casting, namely die casting the filtered aluminum melt to obtain the aluminum alloy casting. The aluminum alloy casting material with the components is obtained after smelting, refining, degassing, filtering and die casting, and has no air holes and slag inclusion, and the surface has no chromatic aberration, no black bars and no white spots after anodic oxidation.
Description
Technical Field
The application relates to the technical field of aluminum alloy manufacturing, in particular to an aluminum alloy for anodic oxidation and a production process thereof.
Background
The anodic oxidation is a process of oxidizing the surface of an aluminum product (anode) to form an aluminum oxide film with the thickness of 4-30um under the action of external current under the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid and the like) and specific process conditions by taking aluminum or aluminum alloy as an anode so as to improve the corrosion resistance, the wear resistance, the high temperature resistance and the decorative effect of the surface of the aluminum profile. Cast aluminum alloys, including die castings, generally have a relatively high silicon content, and anodized films are generally dark in color, colorless transparent oxide films cannot be obtained, and the color of the anodized film ranges from light gray to dark gray as the silicon content increases. Therefore, the conventional cast aluminum alloy is not suitable for improving the corrosion resistance, the wear resistance, the high temperature resistance and the decorative effect of the aluminum alloy surface by using an anodic oxidation mode.
Disclosure of Invention
The application provides an economical and grade-keeping waste aluminum recovery smelting method aiming at the existing waste aluminum recovery and distribution. The application mainly starts from the oxidation requirement, develops a die-casting aluminum alloy cast ingot which can be used for anodic oxidation, and the subsequent die-casting machine can lead the aluminum alloy die-casting machine to have higher corrosion resistance, hardness, insulativity and decoration through the anodic oxidation process, thereby expanding the application field and improving the performance and quality of products.
In a first aspect, the present application provides a production process of an aluminum alloy for anodic oxidation, and adopts the following technical scheme.
A process for producing an aluminum alloy useful for anodic oxidation, the process comprising:
Smelting: melting an aluminum alloy raw material to obtain an aluminum melt; the aluminum alloy raw materials comprise the following components in percentage by mass: 12-14% of Si, 0.5-1% of Fe, 0.03-0.1% of Cu, less than or equal to 0.5% of Mn, 0.1-0.8% of Mg, less than or equal to 0.1% of Cr, 0.01-0.05% of Zn, 0.01-0.05% of Ti, and the balance of aluminum and unavoidable impurities;
Refining: controlling the hydrogen content of the aluminum melt to be 0.25-0.35ml/100gAl;
On-line degassing: removing hydrogen in the aluminum melt after refining to ensure that the hydrogen content of the aluminum melt is less than or equal to 0.125ml/100gAl;
On-line filtering: filtering out solid slag in the aluminum melt after degassing;
And (3) die casting and forming: and (3) die casting the filtered aluminum melt to obtain the aluminum alloy casting material.
By adopting the technical scheme, after smelting, refining, degassing, filtering and die casting the aluminum alloy raw materials of the components, the aluminum alloy casting material is obtained without air holes and slag inclusion, and after anodic oxidation is carried out by using the aluminum alloy casting material, the surface has no chromatic aberration, no black stripes and no white spots. The aluminum alloy raw material can be recycled waste, the waste is reused after the production process is carried out, and the prepared casting material can be anodized to prepare various products.
During smelting, water in fuel and water produced by combustion are easy to enter an aluminum melt, high-temperature aluminum liquid and water molecules dispersed in the high-temperature aluminum liquid are subjected to chemical reaction to generate hydrogen, hydrogen atoms are formed in the aluminum melt, and the hydrogen atoms have higher solubility in the aluminum melt, so that the hydrogen becomes a main component of gas impurities adsorbed by the aluminum melt, and the ratio of the hydrogen to the water is about 85%. During solidification of the aluminum melt, hydrogen gradually precipitates in the form of hydrogen gas to cause pores, cracks, etc. in the aluminum alloy, so that the hydrogen content in the aluminum melt is controlled before die casting. However, hydrogen also reduces metal oxide impurities such as alumina to a metallic state, so that the aluminum melt can be controlled to retain a certain hydrogen content during the refining process. The hydrogen content of the aluminum melt can be detected on line by using an aluminum melt hydrogen meter. The proposal controls the hydrogen content of the aluminum melt to be 0.25-0.35ml/100gAl during refining, can reduce some metal oxides, improves the purity of metal, controls the hydrogen content of the aluminum melt to be less than or equal to 0.125ml/100gAl after refining, and reduces the adverse phenomena of casting bubbles and the like formed after die casting. The online degassing machine can be used for degassing, inert gases such as nitrogen, argon and the like are introduced into the aluminum melt by the online degassing machine to form bubbles, and hydrogen in the melt is diffused into the bubbles under the action of partial pressure difference and is removed along with the floating of the bubbles, so that the purpose of degassing is achieved. The bubbles can adsorb partial oxide inclusion in the floating process, so as to play a role in impurity removal.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the aluminum alloy raw materials comprise the following components in percentage by mass: 13.1% of Si, 0.85% of Fe, 0.08% of Cu, 0.04% of Mn, 0.35% of Mg, 0.07% of Cr, 0.03% of Zn, 0.01% of Ti, and the balance of aluminum and unavoidable impurities.
By adopting the technical scheme, the raw materials are used for die casting to obtain the aluminum alloy flat cast ingot with uniform, non-abnormal point and pore-free surface, the whole body has no chromatic aberration after anodic oxidation, and the product has no black strips and white spots.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the aluminum alloy raw materials comprise the following components in percentage by mass: 12.9% of Si, 0.96% of Fe, 0.06% of Cu, 0.03% of Mn, 0.54% of Mg, 0.04% of Cr, 0.05% of Zn, 0.02% of Ti, and the balance of aluminum and unavoidable impurities.
By adopting the technical scheme, the raw materials are used for die casting to obtain the aluminum alloy flat cast ingot with uniform, non-abnormal point and pore-free surface, the whole body has no chromatic aberration after anodic oxidation, and the product has no black strips and white spots.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the hydrogen content of the aluminum melt is controlled to be 0.30-0.33ml/100gAl during refining.
By adopting the technical scheme, the aluminum melt with the hydrogen content has less oxidized impurities and the prepared metal has high purity.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the hydrogen content of the aluminum melt is controlled by controlling the temperature of the aluminum melt during refining.
By adopting the technical scheme, the higher the temperature is in a certain temperature range, the higher the solubility of hydrogen in the aluminum melt, the hydrogen content is regulated and controlled by controlling the temperature of the aluminum melt, the method is reliable, no other reagent is needed, and the cost is low.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the temperature of the aluminum melt is controlled to be 800-900 ℃ during refining.
By adopting the technical scheme, the higher the temperature is in the range of 800-900 ℃, the higher the solubility of hydrogen in the aluminum melt is, and the hydrogen content of the aluminum melt can be controlled to be 0.25-0.35ml/100gAl in the temperature range. If necessary, the hydrogen content of the aluminum melt can be regulated and controlled by introducing water vapor into the aluminum melt.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the online filtration comprises the steps of filtering the degassed aluminum melt by a two-stage filter plate, wherein the first filter plate is 30 meshes, and the second filter plate is 50 meshes.
By adopting the technical scheme, the solid slag in the aluminum melt can be filtered, so that the surface of the aluminum melt after preparation and molding basically has no abnormal phenomena such as black spots, white spots and the like. The filter material can be an aluminum water filter screen made of alkali-free glass fiber yarns.
As an improvement of the production process of the aluminum alloy for anodic oxidation, the die casting is carried out when the temperature of the aluminum melt is controlled to be 600-660 ℃.
By adopting the technical scheme, the melting point of the aluminum alloy raw material is about 560-580 ℃, and the lower melting temperature of 600-660 ℃ is used, so that on one hand, the cost is reduced, on the other hand, the aluminum melt can be solidified faster, the cast material structure is compact, and the occurrence of adverse phenomena such as surface oxidation, chromatic aberration, air holes and the like can be reduced.
In a second aspect, the application also provides an aluminum alloy, and the following technical scheme is adopted.
An aluminum alloy prepared according to the production process described above.
By adopting the technical scheme, the aluminum alloy has high purity, smooth surface, basically no air holes, no chromatic aberration and no black and white spots.
In summary, the aluminum alloy for anodic oxidation and the production process thereof have the following beneficial effects: the aluminum alloy raw material is smelted and a refining step is added to obtain the aluminum alloy with high purity, the grain size of an aluminum alloy product is not more than level 2, the porosity is not more than level 2, the maximum single-point long diameter of microscopic porosity is not more than 80 mu m, the maximum single grain size is not more than 500 mu m, the content of melt slag is less than or equal to 0.02mm 2/kgAl (the melt mainly contains impurities such as magnesium oxide, spinel, titanium boride and the like), and no air holes and slag inclusion exist basically during die casting production of the melt. The aluminum alloy obtained by the production process has no pores, black spots, chromatic aberration and the like on the surface of an oxidized product when the aluminum alloy is used for anodic oxidation, has uniform surface, high purity and good corrosion resistance, wear resistance, high temperature resistance and decorative appearance.
Detailed Description
In order to facilitate understanding of the solution of the present application, the technical solution of the present application will be further described with reference to some embodiments, but the embodiments of the present application are not limited thereto.
Example 1
The aluminum alloy comprises, by mass, 13.1% of Si, 0.85% of Fe, 0.08% of Cu, 0.04% of Mn, 0.35% of Mg, 0.07% of Cr, 0.03% of Zn, 0.01% of Ti, and the balance of aluminum and unavoidable impurities. The production process of the aluminum alloy for anodic oxidation comprises the following steps:
Smelting: and adding the aluminum alloy raw material into a smelting furnace for smelting.
Refining in a furnace: refining in a furnace by using a ventilation bed system at the bottom of the smelting furnace, and controlling the temperature of the aluminum melt to 845 ℃ so that the hydrogen content in the aluminum melt is 0.30ml/100gAl.
On-line degassing: the aluminum melt was degassed using an on-line degasser line to give an aluminum melt hydrogen content of 0.12ml/100gAl.
On-line filtering: the aluminum melt was filtered through two stage filter plates, the first filter plate being 30 mesh, the second filter plate being 50 mesh, the slag content being 0.018mm2/kgAl.
And (3) die casting and forming: and (3) die casting the filtered aluminum melt at the die casting temperature of 630 ℃ to obtain the aluminum alloy casting material with good surface. The surface of the aluminum alloy casting material is smooth and clean, and has no black spots, white spots, air holes and cracks.
The test shows that the tensile strength of the aluminum alloy casting material is 301MPa, and the yield strength is 242MPa. The whole aluminum alloy casting material has no chromatic aberration after anodic oxidation, and the product has no black strip, no black spot, no white spot and no hole.
Example 2
The aluminum alloy comprises, by mass, 12.9% of Si, 0.96% of Fe, 0.06% of Cu, 0.03% of Mn, 0.54% of Mg, 0.04% of Cr, 0.05% of Zn, 0.02% of Ti, and the balance of aluminum and unavoidable impurities. The production process of the aluminum alloy for anodic oxidation comprises the following steps:
Smelting: and adding the aluminum alloy raw material into a smelting furnace for smelting.
Refining in a furnace: and refining in the furnace by using a ventilation bed system at the bottom of the smelting furnace, and controlling the temperature of the aluminum melt to 880 ℃ so that the hydrogen content in the aluminum melt is 0.33ml/100gAl.
On-line degassing: the aluminum melt was degassed using an on-line degasser line to give an aluminum melt hydrogen content of 0.10ml/100gAl.
On-line filtering: the aluminum melt is filtered by a two-stage filter plate, wherein the first filter plate is 30 meshes, the second filter plate is 50 meshes, and the slag content is 0.015mm2/kgAl.
And (3) die casting and forming: and (3) die casting the filtered aluminum melt at the die casting temperature of 625 ℃ to obtain the aluminum alloy casting material with good surface, wherein the aluminum alloy casting material has smooth surface, no black spots, no white spots, no air holes and no cracks.
The test shows that the tensile strength of the aluminum alloy casting material is 310MPa, and the yield strength is 243MPa. The whole aluminum alloy casting material has no chromatic aberration after anodic oxidation, and the product has no black strip, no black spot, no white spot and no hole.
Example 3
This example used substantially the same protocol as example 2 to obtain an aluminum alloy casting, the only difference being that: the hydrogen content of the aluminum melt is controlled to be 0.29ml/100gAl during refining. The aluminum alloy casting material with good surface is obtained by die casting, and the surface of the aluminum alloy casting material is smooth and clean, and has no black spots, white spots, air holes and cracks. The test shows that the tensile strength of the aluminum alloy casting material is 297MPa, and the yield strength is 238MPa. The whole aluminum alloy casting material has no chromatic aberration after anodic oxidation, and the product has no black strip, no black spot, no white spot and no hole.
Comparative example 1
This comparative example uses substantially the same protocol as in example 3 to obtain an aluminum alloy casting, the only difference being that: in the on-line degassing, the hydrogen content of the aluminum melt was controlled to be 0.18ml/100gAl.
Compared with the aluminum melt hydrogen content after on-line degassing in example 3, which is controlled to be 0.10ml/100gAl, the aluminum melt hydrogen content in comparative example 1 is too high, and the aluminum alloy casting material obtained by die casting has a slight air hole phenomenon.
Comparative example 2
This comparative example uses substantially the same protocol as in example 1 to obtain an aluminum alloy casting, the only difference being that: comparative example 2 removed the refining step.
The aluminum alloy casting obtained in comparative example 2 had a slight white spot phenomenon on the surface.
The tensile strength of the aluminum alloy casting of comparative example 2 was 285MPa and the yield strength was 226MPa. The aluminum alloy casting material has slight speckle color difference and heterochromatic points after anodic oxidation.
Comparative example 3
This comparative example uses substantially the same protocol as in example 1 to obtain an aluminum alloy casting, the only difference being that: the die casting temperature of comparative example 3 was 800 ℃. The aluminum alloy casting material obtained in comparative example 2 had a slight color difference on the surface.
The tensile strength of the aluminum alloy casting of comparative example 3 was 291MPa and the yield strength was 235MPa. The aluminum alloy casting material has slight block color difference after anodic oxidation.
By combining the above, the aluminum alloy casting obtained by adopting the production process of the embodiment 1-3 has good appearance and strength, the aluminum alloy is basically free of air holes and slag inclusion, the tensile strength of the aluminum alloy casting can reach 297-310MPa, and the yield strength can reach 238-243MPa. When the aluminum alloy is used for anodic oxidation, the surface of the oxidized product has no pores, black spots, chromatic aberration and the like, the surface is uniform, the purity is high, and the product has good corrosion resistance, wear resistance, high temperature resistance and decorative appearance. The aluminum alloy material prepared by the process is suitable for obtaining products with corresponding appearance and functions through anodic oxidation.
The above are merely some embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments, and it should be understood by those skilled in the art that several improvements and extensions made according to the above embodiments are also included in the protection scope of the present application without departing from the spirit of the present application.
Claims (9)
1. A process for producing an aluminum alloy useful for anodic oxidation, the process comprising:
Smelting: melting an aluminum alloy raw material to obtain an aluminum melt; the aluminum alloy raw materials comprise the following components in percentage by mass: 12-14% of Si, 0.5-1% of Fe, 0.03-0.1% of Cu, less than or equal to 0.5% of Mn, 0.1-0.8% of Mg, less than or equal to 0.1% of Cr, 0.01-0.05% of Zn, 0.01-0.05% of Ti, and the balance of aluminum and unavoidable impurities;
Refining: controlling the hydrogen content of the aluminum melt to be 0.25-0.35ml/100gAl;
On-line degassing: removing hydrogen in the aluminum melt after refining to ensure that the hydrogen content of the aluminum melt is less than or equal to 0.125ml/100gAl;
On-line filtering: filtering out solid slag in the aluminum melt after degassing;
And (3) die casting and forming: and (3) die casting the filtered aluminum melt to obtain the aluminum alloy casting material.
2. The process for producing an aluminum alloy usable for anodic oxidation according to claim 1, wherein the raw materials of the aluminum alloy comprise the following components in mass percent: 13.1% of Si, 0.85% of Fe, 0.08% of Cu, 0.04% of Mn, 0.35% of Mg, 0.07% of Cr, 0.03% of Zn, 0.01% of Ti, and the balance of aluminum and unavoidable impurities.
3. The process for producing an aluminum alloy usable for anodic oxidation according to claim 1, wherein the raw materials of the aluminum alloy comprise the following components in mass percent: 12.9% of Si, 0.96% of Fe, 0.06% of Cu, 0.03% of Mn, 0.54% of Mg, 0.04% of Cr, 0.05% of Zn, 0.02% of Ti, and the balance of aluminum and unavoidable impurities.
4. The process for producing an aluminum alloy usable for anodic oxidation according to claim 1, wherein the hydrogen content of the aluminum melt is controlled to be 0.30 to 0.33ml/100g al at the time of refining.
5. The process for producing an aluminum alloy usable for anodic oxidation according to claim 1 or 4, wherein the hydrogen content of the aluminum melt is controlled by controlling the temperature of the aluminum melt at the time of refining.
6. The process for producing an aluminum alloy usable for anodic oxidation according to claim 5, wherein the temperature of the aluminum melt is controlled to 800 to 900 ℃ at the time of refining.
7. The process for producing an aluminum alloy usable for anodic oxidation according to claim 1, wherein the on-line filtration comprises filtering the degassed aluminum melt by a two-stage filter plate having a first filter plate of 30 mesh and a second filter plate of 50 mesh.
8. The process for producing an aluminum alloy usable for anodic oxidation according to claim 1, wherein die casting is performed while controlling the temperature of the aluminum melt to 600 to 660 ℃.
9. An aluminum alloy, characterized by being produced by the production process according to any one of claims 1 to 8.
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