CN118291889B - Preparation method of copper-plated titanium alloy silk-screen reinforced aluminum alloy for automobile front cover plate - Google Patents
Preparation method of copper-plated titanium alloy silk-screen reinforced aluminum alloy for automobile front cover plate Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 79
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
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- 239000006260 foam Substances 0.000 claims abstract description 44
- 238000005530 etching Methods 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 230000004913 activation Effects 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010949 copper Substances 0.000 claims abstract description 18
- 229910052802 copper Inorganic materials 0.000 claims abstract description 18
- 238000009713 electroplating Methods 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003973 paint Substances 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 238000005097 cold rolling Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000005406 washing Methods 0.000 claims description 35
- 230000008021 deposition Effects 0.000 claims description 21
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 11
- 239000003513 alkali Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000009941 weaving Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 244000137852 Petrea volubilis Species 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 7
- 239000003995 emulsifying agent Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
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- 239000010410 layer Substances 0.000 abstract description 16
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- 238000000576 coating method Methods 0.000 abstract description 13
- 239000010936 titanium Substances 0.000 abstract description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 4
- 229910000765 intermetallic Inorganic materials 0.000 abstract description 4
- 229910052719 titanium Inorganic materials 0.000 abstract description 4
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011229 interlayer Substances 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 238000009954 braiding Methods 0.000 abstract 1
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- 239000000463 material Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
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- 239000010953 base metal Substances 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
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- 238000005728 strengthening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010038 TiAl Inorganic materials 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- IUYOGGFTLHZHEG-UHFFFAOYSA-N copper titanium Chemical compound [Ti].[Cu] IUYOGGFTLHZHEG-UHFFFAOYSA-N 0.000 description 1
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- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a preparation method of copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate, which comprises the steps of braiding a TC4 wire mesh, cleaning, performing etching activation treatment, then electroplating a copper layer, performing heat treatment on the copper-plated titanium alloy wire mesh, preparing the copper-plated titanium alloy wire mesh and EPS foam after heat treatment into a lost foam, coating refractory paint on the surface of the lost foam, drying, packing into a box, filling dry sand into the box for jolt ramming, smelting aluminum alloy into molten metal, pouring the molten metal into the lost foam, cooling to room temperature, forming an ingot, performing heat treatment on the ingot at 500-550 ℃, performing hot rolling and cold rolling to obtain a blank, and performing stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product; according to the invention, copper is adopted as a transition interlayer of an aluminum-titanium interface, so that the generation of brittle intermetallic compounds between aluminum and titanium can be effectively inhibited, the strength of the interface is improved, and the prepared automobile front cover plate has higher strength and plasticity and can better resist external impact and deformation.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy, and relates to a preparation method of copper-plated titanium alloy silk screen reinforced aluminum alloy for an automobile front cover plate.
Background
Under the background that the improvement difficulty of the existing engine technology is increasing and the efficiency of a power battery is low, the lightweight technology is a common basic technology whether the traditional fuel automobile or the new energy automobile. As a light material with various excellent performances, the aluminum alloy becomes the first choice material in the development of the current automobile light weight technology. The aluminum casting part capable of bearing large load not only can obviously reduce weight, but also has higher strength. Such a plate has a complex geometry, typically by vacuum die casting, to give it a high strength. In addition, the aluminum casting also has high ductility, good welding performance and high plasticity, and ensures high safety in collision.
The automobile front cover plate is usually manufactured by using 5-series aluminum alloy, and the existing 5-series aluminum alloy at present takes Mg as a main element, so that the alloy is a heat-treatable reinforced alloy. Mg atoms are solid-dissolved in the aluminum matrix, resulting in a solid-solution strengthening effect. The 5 series alloy has similar strength, formability and corrosion resistance to the common steel plate. The strength of an alloy is mainly dependent on Mg content and degree of strain strengthening, and strength is obtained by work hardening, and is generally used for manufacturing automobile panels such as a hood, a trunk lid, a load floor, and the like due to its excellent properties. In order to make the front cover plate of the automobile better resistant to external impact and deformation, and to increase the stability of the whole automobile structure, it is necessary to simultaneously improve the strength and plasticity of the front cover plate of the automobile. However, in the process of stamping the automobile front cover plate, the yield strength of the material is high, the elongation is low, and the formability is poor. Aiming at the problem, based on the advantages of high strength, good heat stability, corrosion resistance and the like of TC4 titanium alloy and similar elongation percentage to aluminum alloy, the titanium alloy wire is used as continuous fiber to be embedded into the aluminum alloy section bar, so that the improvement of the mechanical property of the section bar has important application prospect, but because the physical and chemical properties of aluminum and titanium are greatly different, the metallurgical reaction is extremely easy to generate brittle intermetallic compounds such as Ti 3Al、TiAl、TiAl3、Ti2Al5, and the like, the interface property of the prepared titanium alloy wire reinforced aluminum-based composite material is poor, and external impact and deformation resistance are difficult to be better resisted, so that the titanium alloy wire reinforced aluminum-based composite material is difficult to be practically applied to the production and the manufacture of automobile front cover plates.
Disclosure of Invention
The invention aims to provide a preparation method of copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate, which solves the problems that the titanium alloy wire reinforced aluminum matrix composite prepared by the existing method has poor interface performance and is difficult to be practically applied to the production of the automobile front cover plate.
The technical scheme adopted by the invention is that the preparation method of the copper-plated titanium alloy wire mesh reinforced aluminum alloy for the automobile front cover plate comprises the following steps:
Step 1, weaving a TC4 silk screen, cleaning, performing etching activation treatment, and then electroplating a copper layer to obtain a copper-plated titanium alloy silk screen;
Step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 820-880 ℃ at 8 ℃/min for 15-60 min, then cooling to 740 ℃ from 820-880 ℃ at a cooling rate of 5 ℃/min, and then carrying out heat preservation for 5min, then cooling to 500 ℃ from 740 ℃ at a cooling rate of 5 ℃/min, and finally cooling to room temperature along with the furnace;
step 3, preparing the copper-plated titanium alloy wire mesh and EPS foam after heat treatment into a lost foam, brushing refractory paint on the surface of the lost foam, drying, then packaging, and filling dry sand into the box for jolt ramming;
step 4, smelting aluminum alloy into molten metal, pouring the molten metal into a lost foam, after pouring, compensating a riser, and then cooling to room temperature to form an ingot;
And 5, performing heat treatment at 500-550 ℃ on the cast ingot, performing hot rolling and cold rolling to obtain an automobile front cover plate blank, and performing stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product.
The step 1 specifically comprises the following steps:
Step 1.1, preparing a plurality of TC4 wires with diameters of 0.01mm-0.1mm, polishing the wires by sand paper, and weaving the wires into a TC4 wire mesh;
Step 1.2, carrying out H 2SO4 acid washing and NaOH alkali washing on the compiled TC4 silk screen to remove oil, then washing with alcohol, drying after washing, and finally carrying out etching activation treatment;
And 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the deposition temperature is 60-80 ℃, the deposition current is 0.01-0.09A, and the deposition time is 30-120 min, so as to obtain the copper-plated titanium alloy silk screen.
In the step 3, the copper-plated titanium alloy wire mesh after heat treatment and EPS foam are manufactured into a lost foam, wherein the copper-plated titanium alloy wire mesh in the lost foam comprises 2-5 layers, and the layering angle is 0 degree, 15 degrees, 30 degrees or 45 degrees.
In the step 1.2, the concentration of H 2SO4 used for acid washing is 5-10wt%, and the concentration of NaOH used for alkali washing is 1-3wt%.
In the step 1.2, the etching temperature of the etching activation treatment is 35-50 ℃, the etching time is 15-30 min, the etching liquid consists of 10-15wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of glycol and 5-10wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%.
In the step 1.3, the TC4 silk screen after etching activation treatment is electroplated with a copper layer, wherein the electroplating solution comprises 55-83 wt% of CuSO 4·5H2O,14~42wt%H2SO4, less than or equal to 1wt% of emulsifying agent, less than or equal to 1wt% of sodium sulfonate and less than or equal to 1wt% of sodium chloride, and the mass percentage sum of the components is 100%.
In the step 4, aluminum alloy is smelted into molten metal and poured into the lost foam, the pouring temperature of the molten metal is 630-730 ℃, the pouring time is 40-50 s, and the riser is fed after the pouring is completed for 1 minute.
In the step 5, the cast ingot is subjected to heat treatment at 500-550 ℃ for 1-4 h.
The aluminum alloy is 5 series aluminum alloy.
The invention has the following beneficial effects:
(1) The copper-plated TC4 titanium alloy wire mesh reinforced aluminum alloy is adopted to prepare the automobile front cover plate, so that the strength and plasticity of the automobile front cover plate can be obviously improved, the automobile front cover plate can better resist external impact and deformation, the stability of the whole automobile structure is improved, the bending strength of the prepared automobile front cover plate can reach 1152MPa as high as 84J as high as possible, and the strength and the extensibility of the material are obviously improved;
(2) Compared with the traditional pure aluminum alloy, the copper-plated TC4 titanium alloy wire mesh reinforced aluminum alloy has higher specific strength and specific rigidity, so that the material consumption can be reduced when the material is used for manufacturing the automobile front cover plate, the weight of the whole automobile is reduced, and the fuel economy and the running performance are improved;
(3) The existence of the copper-plated TC4 titanium alloy wire mesh can effectively prevent the aluminum alloy from being corroded in a humid or corrosive environment, can provide additional corrosion resistance under the action of the copper protective layer, and prolongs the service life of the front cover plate of the automobile;
(4) Copper is adopted as a transition interlayer of an aluminum-titanium interface, so that the generation of brittle intermetallic compounds between aluminum and titanium can be effectively inhibited, the strength of the interface is improved, and the problem that the interface performance of the titanium alloy wire reinforced aluminum-based composite material prepared by the existing method is poor is solved;
(5) The TC4 silk screen is etched and activated before copper plating, so that impurities such as dust on the surface of the TC4 silk screen can be better removed, a clean and fresh metal surface can be obtained, and preparation is made for finally obtaining a high-quality plating layer so as to improve the bonding strength of a copper-titanium interface;
(6) The copper-plated titanium alloy wire mesh is subjected to heat treatment, so that the binding force between titanium and copper can be effectively improved, and the traditional heat treatment process has the advantages that the cooling speed is high, the shrinkage of the copper base metal is serious, and the crack defect is easily caused at the interface of the copper base metal and intermetallic compounds.
Drawings
FIG. 1 is a schematic diagram of the construction of a lost foam in a method for producing a copper-plated titanium alloy wire mesh-reinforced aluminum alloy for an automotive front cover plate of the present invention;
FIG. 2 is a top view of a lost foam in a method of making a copper-plated titanium alloy wire mesh-reinforced aluminum alloy for an automotive front cover plate in accordance with the present invention;
FIG. 3 is a schematic view of the structure of a 0℃copper-plated titanium alloy wire net in example 1 of the present invention;
FIG. 4 is a schematic view of the structure of a 15℃copper-plated titanium alloy wire net in example 2 of the present invention;
FIG. 5 is a schematic view showing the structure of a 30℃copper-plated titanium alloy wire net in example 3 of the present invention;
FIG. 6 is a schematic view of the structure of a 45℃copper-plated titanium alloy wire net in example 4 of the present invention.
In the figure, 1, a copper-plated titanium alloy wire mesh, 2, EPS foam, 3, lost foam, 4, dry sand and 5, riser.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The preparation method of the copper-plated titanium alloy silk screen reinforced aluminum alloy for the automobile front cover plate comprises the following steps:
Step 1, preparing a copper-plated titanium alloy silk screen, which comprises the following specific steps:
step 1.1, preparing a plurality of TC4 wires with the diameters of 0.01mm-0.1mm, polishing the wires by using 60-mesh sand paper, and weaving the wires into a TC4 wire mesh.
Step 1.2, carrying out H 2SO4 acid washing and NaOH alkali washing oil removal on the woven TC4 silk screen, then washing with alcohol, cleaning, drying, finally carrying out etching activation treatment, wherein the etching temperature is 35-50 ℃, the etching time is 15-30 min, the etching liquid consists of 10-15wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of glycol and 5-10wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%; the concentration of H 2SO4 used for pickling is 5-10wt%, and the concentration of NaOH used for alkaline cleaning is 1-3wt%;
Step 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the deposition temperature is 60-80 ℃, the deposition current is 0.01-0.09A, and the deposition time is 30-120 min, so as to obtain a copper-plated titanium alloy silk screen 1; the electroplating solution comprises 55-83 wt% of CuSO 4·5H2O,14~42wt%H2SO4, 1wt% of emulsifier, sodium sulfonate and sodium chloride, and the total mass percentage of the components is 100%;
Step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh 1, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 820-880 ℃ at 8 ℃/min for 15-60 min, then cooling to 740 ℃ from 820-880 ℃ at a cooling rate of 5 ℃/min and preserving heat for 5min, then cooling to 500 ℃ from 740 ℃ at a cooling rate of 5 ℃/min, and finally cooling to room temperature along with the furnace;
Step 3, referring to fig. 1 and 2, preparing a copper-plated titanium alloy wire mesh 1 and EPS foam 2 after heat treatment into a lost foam 3, wherein the copper-plated titanium alloy wire mesh comprises 2-5 layers, the layering angle is 0 DEG, 15 DEG, 30 DEG or 45 DEG, coating a refractory coating on the surface of the lost foam 3, drying, repeatedly coating the refractory coating, drying for one time, then boxing, and filling dry sand 4 jolt in the box;
step 4, smelting the 5-series aluminum alloy into molten metal, pouring the molten metal into the lost foam 3, wherein the pouring temperature of the molten metal is 630-730 ℃, the pouring time is 40-50 s, after pouring is completed for 1 minute, the riser 5 is complemented, and then cooling to room temperature to form an ingot;
and 5, carrying out heat treatment on the cast ingot at 500-550 ℃ for 1-4 h, then carrying out hot rolling and cold rolling in sequence to obtain a blank body of the automobile front cover plate, and finally carrying out stress relief annealing treatment on the blank body to obtain a finished product of the automobile front cover plate.
Example 1
A preparation method of copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate comprises the following steps:
Step 1, preparing a copper-plated titanium alloy silk screen, which comprises the following specific steps:
Step 1.1, preparing a plurality of TC4 wires with the diameter of 0.01mm, polishing the wires by using 60-mesh sand paper, and weaving the wires into a TC4 wire mesh.
Step 1.2, carrying out H 2SO4 acid washing and NaOH alkali washing oil removal on the compiled TC4 silk screen, then washing with alcohol, drying after washing, finally carrying out etching activation treatment, wherein the etching temperature is 35 ℃, the etching time is 15min, the etching liquid consists of 10wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of ethylene glycol and 10wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%; the concentration of H 2SO4 adopted in the acid washing is 10wt percent, and the concentration of NaOH adopted in the alkali washing is 1wt percent;
step 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the deposition temperature is 60 ℃, the deposition current is 0.09A, and the deposition time is 30min, so as to obtain a copper-plated titanium alloy silk screen; the electroplating solution comprises 55wt% of CuSO 4·5H2O,42wt%H2SO4, 1wt% of emulsifying agent, 1wt% of sodium sulfonate and 1wt% of sodium chloride, wherein the total mass percentage of the components is 100%;
Step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 820 ℃ at 8 ℃/min for 30min, then cooling from 820 ℃ to 740 ℃ at a cooling rate of 5 ℃/min for 5min, then cooling from 740 ℃ to 500 ℃ at a cooling rate of 5 ℃/min, and finally cooling to room temperature along with the furnace;
Step 3, referring to fig. 3, preparing a copper-plated titanium alloy wire mesh and EPS foam after heat treatment into a lost foam, wherein the copper-plated titanium alloy wire mesh comprises 2 layers, the layering angle is 0 DEG, coating fire-resistant paint on the surface of the lost foam, drying, repeatedly coating fire-resistant paint, drying for one time, then packaging, and filling dry sand in the box for jolt ramming;
step 4, smelting the 5-series aluminum alloy into molten metal, pouring the molten metal into a lost foam, wherein the pouring temperature of the molten metal is 630 ℃, the pouring time is 40s, after pouring is completed for 1 minute, feeding a riser, and then cooling to room temperature to form an ingot;
and 5, carrying out heat treatment on the cast ingot at 500 ℃ for 4 hours, then carrying out hot rolling and cold rolling in sequence to obtain an automobile front cover plate blank, and finally carrying out stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product.
Example 2
A preparation method of copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate comprises the following steps:
Step 1, preparing a copper-plated titanium alloy silk screen, which comprises the following specific steps:
step 1.1, preparing a plurality of TC4 wires with the diameter of 0.04mm, polishing the wires by using 60-mesh sand paper, and weaving the wires into a TC4 wire mesh.
Step 1.2, carrying out H 2SO4 acid washing, naOH alkali washing and oil removal on the woven TC4 silk screen, then washing with alcohol, drying after washing, finally carrying out etching activation treatment, wherein the etching temperature is 40 ℃, the etching time is 20min, the etching liquid consists of 12wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of ethylene glycol and 8wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%; the concentration of H 2SO4 used for pickling is 5wt%, and the concentration of NaOH used for alkaline cleaning is 2wt%;
Step 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the deposition temperature is 70 ℃, the deposition current is 0.01A, and the deposition time is 120min, so as to obtain a copper-plated titanium alloy silk screen; the electroplating solution comprises 65wt% of CuSO 4·5H2O,33wt%H2SO4, 1wt% of an emulsifying agent, 0.5wt% of sodium sulfonate and 0.5wt% of sodium chloride, wherein the total mass percentage of the components is 100%;
Step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 840 ℃ for 15min at 8 ℃/min, then cooling from 840 ℃ to 740 ℃ at a cooling rate of 5 ℃/min and preserving the heat for 5min, then cooling from 740 ℃ to 500 ℃ at a cooling rate of 5 ℃/min, and finally cooling to room temperature along with the furnace;
Step 3, referring to fig. 4, preparing a heat-treated copper-plated titanium alloy wire mesh and EPS foam into a lost foam, wherein the copper-plated titanium alloy wire mesh comprises 3 layers, the layering angle is 15 degrees, coating fire-resistant paint on the surface of the lost foam, drying, repeatedly coating fire-resistant paint, drying for one time, then packaging, and filling dry sand in the box for jolt ramming;
step 4, smelting the 5-series aluminum alloy into molten metal, pouring the molten metal into a lost foam, wherein the pouring temperature of the molten metal is 680 ℃, the pouring time is 45s, after pouring is completed for 1 minute, feeding the riser, and then cooling to room temperature to form an ingot;
And 5, carrying out heat treatment at 520 ℃ on the cast ingot for 2 hours, then carrying out hot rolling and cold rolling in sequence to obtain an automobile front cover plate blank, and finally carrying out stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product.
Example 3
A preparation method of copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate comprises the following steps:
Step 1, preparing a copper-plated titanium alloy silk screen, which comprises the following specific steps:
step 1.1, preparing a plurality of TC4 wires with the diameter of 0.07mm, polishing the wires by using 60-mesh sand paper, and weaving the wires into a TC4 wire mesh.
Step 1.2, carrying out H 2SO4 acid washing, naOH alkali washing and oil removal on the compiled TC4 silk screen, then washing with alcohol, drying after washing, finally carrying out etching activation treatment, wherein the etching temperature is 45 ℃, the etching time is 25min, the etching liquid consists of 14wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of ethylene glycol and 6wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%; the concentration of H 2SO4 used for pickling is 5wt%, and the concentration of NaOH used for alkaline cleaning is 3wt%;
Step 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the deposition temperature is 75 ℃, the deposition current is 0.05A, and the deposition time is 80min, so as to obtain a copper-plated titanium alloy silk screen; the electroplating solution comprises 75wt% of CuSO 4·5H2O,22wt%H2SO4, 1wt% of an emulsifying agent, 1wt% of sodium sulfonate and 1wt% of sodium chloride, wherein the total mass percentage of the components is 100%;
step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 860 ℃ at 8 ℃/min for 40min, then cooling to 740 ℃ from 860 ℃ at a cooling speed of 5 ℃/min for 5min, then cooling to 500 ℃ from 740 ℃ at a cooling speed of 5 ℃/min, and finally cooling to room temperature along with the furnace;
Step 3, referring to fig. 5, preparing a heat-treated copper-plated titanium alloy wire mesh and EPS foam into a lost foam, wherein the copper-plated titanium alloy wire mesh comprises 4 layers, the layering angle is 30 degrees, coating fire-resistant paint on the surface of the lost foam, drying, repeatedly coating fire-resistant paint, drying for one time, then packaging, and filling dry sand in the box for jolt ramming;
step 4, smelting the 5-series aluminum alloy into molten metal, pouring the molten metal into a lost foam, wherein the pouring temperature of the molten metal is 700 ℃, the pouring time is 43s, after pouring is completed for 1 minute, feeding a riser, and then cooling to room temperature to form an ingot;
And 5, carrying out heat treatment on the cast ingot at 540 ℃ for 2 hours, then carrying out hot rolling and cold rolling in sequence to obtain an automobile front cover plate blank, and finally carrying out stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product.
Example 4
A preparation method of copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate comprises the following steps:
Step 1, preparing a copper-plated titanium alloy silk screen, which comprises the following specific steps:
Step 1.1, preparing a plurality of TC4 wires with the diameter of 0.1mm, polishing the wires by using 60-mesh sand paper, and weaving the wires into a TC4 wire mesh.
Step 1.2, carrying out H 2SO4 acid washing, naOH alkali washing and oil removal on the compiled TC4 silk screen, then washing with alcohol, drying after washing, finally carrying out etching activation treatment, wherein the etching temperature is 50 ℃, the etching time is 30min, the etching liquid consists of 15wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of ethylene glycol and 5wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%; the concentration of H 2SO4 adopted in the acid washing is 7wt percent, and the concentration of NaOH adopted in the alkali washing is 1wt percent;
Step 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the deposition temperature is 80 ℃, the deposition current is 0.08A, and the deposition time is 100min, so as to obtain a copper-plated titanium alloy silk screen; the electroplating solution comprises 83wt% of CuSO 4·5H2O,15wt%H2SO4, 1wt% of an emulsifying agent, 0.8wt% of sodium sulfonate and 0.2wt% of sodium chloride, wherein the total mass percentage of the components is 100%;
Step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 880 ℃ for 60min at 8 ℃/min, then cooling from 880 ℃ to 740 ℃ at a cooling rate of 5 ℃/min and preserving the heat for 5min, then cooling from 740 ℃ to 500 ℃ at a cooling rate of 5 ℃/min, and finally cooling to room temperature along with the furnace;
Step3, referring to fig. 6, preparing a heat-treated copper-plated titanium alloy wire mesh and EPS foam into a lost foam, wherein the copper-plated titanium alloy wire mesh comprises 5 layers, the layering angle is 45 degrees, coating fire-resistant paint on the surface of the lost foam, drying, repeatedly coating fire-resistant paint, drying for one time, then packaging, and filling dry sand in the box for jolt ramming;
Step 4, smelting the 5-series aluminum alloy into molten metal, pouring the molten metal into a lost foam, wherein the pouring temperature of the molten metal is 730 ℃, the pouring time is 50s, after pouring is completed for 1 minute, feeding a riser, and then cooling to room temperature to form an ingot;
and 5, carrying out heat treatment on the cast ingot at 550 ℃ for 4 hours, then carrying out hot rolling and cold rolling in sequence to obtain an automobile front cover plate blank, and finally carrying out stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product.
Mechanical property tests were carried out on the 5-series aluminum alloy substrate, TC4 wires (with the diameter of 0.1 mm) and the automobile front cover plate finished products prepared in examples 1-4, and the test results are shown in Table 1:
TABLE 1 mechanical Properties of aluminum alloy matrix, TC4 wire, automobile front cover plate finished product in examples 1-4
Claims (5)
1. The preparation method of the copper-plated titanium alloy silk screen reinforced aluminum alloy for the automobile front cover plate is characterized by comprising the following steps of:
Step 1, weaving a TC4 silk screen, cleaning, performing etching activation treatment, and then electroplating a copper layer to obtain a copper-plated titanium alloy silk screen;
The step 1 specifically comprises the following steps:
Step 1.1, preparing a plurality of TC4 wires with diameters of 0.01mm-0.1mm, polishing the wires by sand paper, and weaving the wires into a TC4 wire mesh;
Step 1.2, carrying out H 2SO4 acid washing and NaOH alkali washing on the compiled TC4 silk screen to remove oil, then washing with alcohol, drying after washing, and finally carrying out etching activation treatment; the concentration of H 2SO4 adopted in acid washing is 5-10wt%, the concentration of NaOH adopted in alkali washing is 1-3wt%, the etching temperature of etching activation treatment is 35-50 ℃, the etching time is 15-30 min, etching liquid consists of 10-15wt% of HF aqueous solution, 10wt% of NH 4HF2, 70wt% of glycol and 5-10wt% of H 2 O, the sum of the mass percentages of the components is 100%, and the volume concentration of the HF aqueous solution is 40%;
Step 1.3, electroplating a copper layer on the TC4 silk screen after etching activation treatment, wherein the electroplating solution comprises 55-83 wt% of CuSO 4·5H2O,14～42wt％H2SO4, less than or equal to 1wt% of emulsifying agent, less than or equal to 1wt% of sodium sulfonate and less than or equal to 1wt% of sodium chloride, the total mass percentage of the components is 100%, the deposition temperature is 60-80 ℃, the deposition current is 0.01-0.09A, and the deposition time is 30-120 min, so as to obtain a copper-plated titanium alloy silk screen;
Step 2, carrying out heat treatment on the copper-plated titanium alloy wire mesh, namely placing the copper-plated titanium alloy wire mesh into a heat treatment furnace, firstly raising the furnace temperature to 740 ℃ at 10 ℃/min for 10min, then raising the furnace temperature to 820-880 ℃ at 8 ℃/min for 15-60 min, then cooling to 740 ℃ from 820-880 ℃ at a cooling rate of 5 ℃/min, and then carrying out heat preservation for 5min, then cooling to 500 ℃ from 740 ℃ at a cooling rate of 5 ℃/min, and finally cooling to room temperature along with the furnace;
step 3, preparing the copper-plated titanium alloy wire mesh and EPS foam after heat treatment into a lost foam, brushing refractory paint on the surface of the lost foam, drying, then packaging, and filling dry sand into the box for jolt ramming;
step 4, smelting aluminum alloy into molten metal, pouring the molten metal into a lost foam, after pouring, compensating a riser, and then cooling to room temperature to form an ingot;
And 5, performing heat treatment at 500-550 ℃ on the cast ingot, performing hot rolling and cold rolling to obtain an automobile front cover plate blank, and performing stress relief annealing treatment on the blank to obtain an automobile front cover plate finished product.
2. The method for preparing a copper-plated titanium alloy wire mesh reinforced aluminum alloy for an automobile front cover plate according to claim 1, wherein in the step 3, the copper-plated titanium alloy wire mesh after heat treatment and EPS foam are made into a lost foam, and the copper-plated titanium alloy wire mesh in the lost foam comprises 2-5 layers, wherein the layering angle is 0 °, 15 °, 30 ° or 45 °.
3. The method for preparing the copper-plated titanium alloy wire mesh reinforced aluminum alloy for the automobile front cover plate according to claim 1, wherein in the step 4, molten aluminum is smelted into molten aluminum and poured into a lost foam, the pouring temperature of the molten aluminum is 630-730 ℃, the pouring time is 40-50 s, and riser compensating is performed after the pouring is completed for 1 minute.
4. The method for producing a copper-plated titanium alloy wire mesh reinforced aluminum alloy for automotive front cover plates according to claim 3, wherein in step 5, the ingot is heat-treated at 500 to 550 ℃ for 1 to 4 hours.
5. The method for producing a copper-plated titanium alloy wire mesh-reinforced aluminum alloy for automotive front cover plates according to claim 1, characterized in that the aluminum alloy is a 5-series aluminum alloy.
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