CN105112736A - Die-cast aluminum alloy and preparing method thereof - Google Patents
Die-cast aluminum alloy and preparing method thereof Download PDFInfo
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Abstract
The invention relates to die-cast aluminum alloy. The die-cast aluminum alloy is composed of, by weight, 1.0%-4.0% of Mn, 0.50%-2.50% of Zn, 0.1%-0.5% of Zr, 0.1%-0.5% of Fe and the balance Al and impurities. The total content of the impurities is 0.2% or less by weight, and the impurities include, by weight, 0.1% or less of Si and 0.1% or less of Cu. In addition, the invention discloses a preparing method of the die-cast aluminum alloy. The preparing method comprises the steps of material preparing, drying, smelting, refining, die casting and anodic oxidation. According to the die-cast aluminum alloy and the preparing method thereof, the die casting process and the anodic oxidation process are adopted, the optimum die-casting technological parameter and the optimum anodic oxidation technological parameter are adopted, and thus the die-cast aluminum alloy not only has good die-casting performance but also has good anodic oxidation performance. The die-cast aluminum alloy can be applied to the fields such as the communication field, the household appliance field, the hardware product field, the electric tool field, the toy field, the decoration field and the door/window/bathroom field. In this way, the die-cast aluminum alloy has great application and popularization value.
Description
Technical field
The present invention relates to metal material field, particularly relate to a kind of aluminium diecast alloy and preparation method thereof.
Background technology
Along with developing rapidly of communication industry and electronic product, the application of the electronic products such as mobile phone, notebook computer and camera is more and more general, becomes the articles for daily use of everybody indispensability.In order to improve the market competitiveness of various electronic product, manufacturer, except actively improving the use properties of electronic product, also does one's utmost the aesthetic property of improving product, portability etc., more favors to obtain human consumer.Therefore, current various electronic product is all towards the aspect such as light, thin, short, little development, especially this electronic product such as mobile phone, notebook computer and camera.Wherein, aluminium diecast alloy due to have attractive in appearance, quality is light, the advantage such as corrosion-resistant, be subject to the favor of more and more manufacturer, therefore, aluminium diecast alloy is widely used in electronic product.
While the mankind constantly pursue raising aluminium diecast alloy mechanical property, also more and more higher to the smooth finish on aluminium diecast alloy surface, wear resistance, corrosion proof requirement, particularly to the requirement of the aluminium diecast alloy of the field application such as communication, household electrical appliances, hardware, power tool, toy, decoration, door and window bathroom.
Aluminum-aluminum alloy surface is easy to generate the very thin pellumina (thickness is about 0.01 ~ 0.02 μm) of one deck, has certain resistance to corrosion in an atmosphere.But because this layer of oxide film is amorphous, it very easily makes Aluminum-aluminum alloy surface lose original gloss.In addition, this oxide film is loose porous, uneven, resistance to corrosion is weak, and becomes easily infected by stain.Therefore, Aluminum-aluminum alloy goods need to carry out anodic oxidation treatment usually.
Al-Si system alloy is aluminium diecast alloy most widely used at present, can usually improve mechanical property, but Production Practice of Casting Technologies can be caused simultaneously correspondingly to decline by carrying high Si content or adding the units such as Cu, Ni, Mg, Ti, rare earth; There is the undesirable problem of anodic oxidation, Si in Al-Si system alloy simultaneously always
2+often be present in electrolytic solution with suspended state, the opacity of electrolytic solution greatly improved, thus affects the smooth finish of oxide film.
For above aluminium diecast alloy Problems existing, being badly in need of one in the market should have good die casting performance, has the novel material of good anodic oxidation performance again.
Summary of the invention
In order to solve the problem and defect, the object of this invention is to provide a kind of aluminium diecast alloy and preparation method thereof.This aluminium diecast alloy not only has good die casting performance and good anodic oxidation performance but also has good aesthetic property.
To achieve these goals, the present invention is by the following technical solutions:
A kind of aluminium diecast alloy, it is made up of the component of following weight percent: the Fe of Zr, 0.1-0.5wt% of Zn, 0.1-0.5wt% of Mn, 0.50-2.50wt% of 1.0-4.0wt%, surplus are Al and impurity;
And content of impurities≤0.2wt%, wherein, impurity Si≤0.1wt%, impurity Cu≤0.1wt%.
Further, it is made up of the component of following weight percent: the Fe of Zr, 0.2-0.4wt% of Zn, 0.2-0.4wt% of Mn, 1.00-2.00wt% of 2.0-3.0wt%, surplus are Al and impurity.
Further, it is made up of the component of following weight percent: the Fe of Zr, 0.3wt% of Zn, 0.3wt% of Mn, 1.5wt% of 2.5wt%, surplus are Al and impurity.
Further, it is made up of the component of following weight percent: the Fe of Zr, 0.1wt% of Zn, 0.1wt% of Mn, 0.50wt% of 1.0wt%, surplus are Al and impurity.
Further, it is made up of the component of following weight percent: the Fe of Zr, 0.5wt% of Zn, 0.5wt% of Mn, 2.50wt% of 4.0wt%, surplus are Al and impurity.
A preparation method for aluminium diecast alloy, comprises the following steps:
Step 1 is got the raw materials ready: prepare the fine aluminium ingot of the formula ratio of said components, pure zinc ingot, Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy;
Step 2 is dry: the raw material in step 1 is carried out drying treatment, and wherein, fine aluminium ingot, pure zinc ingot are dried at 100 DEG C ± 10 DEG C temperature, and Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy are dried at 150 DEG C ± 10 DEG C temperature;
Step 3 melting: first fine aluminium ingot is placed in smelting furnace and is heated to 780-800 DEG C, add Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy subsequently, and Keep agitation is until raw material all melts, be cooled to 700-730 DEG C afterwards, add pure zinc ingot, and Keep agitation is until raw material is all molten into melt, after leaving standstill 10-30min, whether inspection bath composition is qualified;
Step 4 refining: when melt temperature is at 700-740 DEG C, by mode that is artificial or induction stirring, flux is pressed at the bottom of smelting furnace or by blowing inert gas to enter at the bottom of smelting furnace to carry out refining, refining time is 5-20min, completes melting after inspection bath composition is qualified;
Step 5 die casting: after melt qualified for composition in step 4 is cooled to 720-750 DEG C, die casting is preheated in the die cavity of mould of 200-300 DEG C to passing through, wherein, the melt flow of filling when type starts is 0.1-0.5m/s, casting pressure is 80-95MPa, fill type rate more than 70% after, the flow velocity improving melt is 90-120MPa to 1.5-3.0m/s, casting pressure, terminates to obtain die casting until fill type die casting;
Step 6 anodic oxidation treatment: the die casting in step 5 is carried out anodic oxidation treatment, its condition is: sulfuric acid 110-150g/L, citric acid 10-15g/L, lactic acid 5-8g/L, current density 1.2-1.6A/dm
2, voltage 12-16V, oxidization time 10-40min.
Further, also comprise described die casting timeliness or anneal between described step 5 and step 6 and carry out machining, finally carrying out cleaning the step with chemical rightenning.
Further, also comprise after step 6 and described die casting is carried out dyeing sealing of hole, dyeing condition is: temperature: 40-60 DEG C, the time: 5-15min; Sealing of hole condition is: temperature: 80-95 DEG C, the time: 15-25min.
Further, the purity >=99.9wt% of the fine aluminium ingot in described step 1, the purity >=99.9wt% of pure zinc ingot.
Further, aging condition is: temperature: 180 DEG C-220 DEG C, the time: insulation 8-16h, furnace cooling; Anneal condition is: temperature: 250 DEG C-300 DEG C, the time: insulation 8-16h, furnace cooling.
Owing to adopting above technical scheme, the present invention compared with prior art tool has the following advantages: 1, the reasonable design composition of aluminium alloy, by simple alloying element and appropriate proportioning, obtain the aluminium alloy with excellent die casting performance and anodic oxidation performance.2, take suitable raw material and melting technology, ensure that the performance of aluminium diecast alloy.3, have selected best die-casting technological parameter and anode oxidation process parameter to obtain the alloy product of excellent performance.Present invention employs die casting and the large technique of anodic oxidation two, the die-casting technological parameter that collocation is best and anode oxidation process parameter, make the aluminium diecast alloy obtained have good die casting performance and anodic oxidation performance.The present invention has also carried out dyeing treatment process after the anodic oxidation, can contaminate various colour, thus can obtain painted aluminium diecast alloy, therefore makes the aesthetic property of aluminium diecast alloy better.Aluminium diecast alloy of the present invention can meet the application in the fields such as communication, household electrical appliances, hardware, power tool, toy, decoration, door and window bathroom.Therefore aluminium diecast alloy of the present invention has great application value.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of aluminium diecast alloy, it is made up of the component of following weight percent: the Fe of Zr, 0.1-0.5wt% of Zn, 0.1-0.5wt% of Mn, 0.50-2.50wt% of 1.0-4.0wt%, surplus are Al and impurity; Content of impurities≤0.2wt%, wherein, impurity Si≤0.1wt%, impurity Cu≤0.1wt%.
In the preferred case, in order to obtain the better aluminium diecast alloy of performance, in aluminium diecast alloy, the weight percent of each component is: it is made up of the component of following weight percent: the Fe of Zr, 0.2-0.4wt% of Zn, 0.2-0.4wt% of Mn, 1.00-2.00wt% of 2.0-3.0wt%, surplus are Al and impurity.
In order to obtain best mechanical property, it is made up of the component of following weight percent: the Fe of Zr, 0.3wt% of Zn, 0.3wt% of Mn, 1.5wt% of 2.5wt%, surplus are Al and impurity.
Preferably, it is made up of the component of following weight percent: the Fe of Zr, 0.1wt% of Zn, 0.1wt% of Mn, 0.50wt% of 1.0wt%, surplus are Al and impurity.
Preferably, it is made up of the component of following weight percent: the Fe of Zr, 0.5wt% of Zn, 0.5wt% of Mn, 2.50wt% of 4.0wt%, surplus are Al and impurity.
Present invention also offers a kind of preparation method of aluminium diecast alloy, comprise the following steps:
Step 1 is got the raw materials ready: get out the fine aluminium ingot (purity >=99.9wt%) of the formula ratio of said components, pure zinc ingot (purity >=99.9wt%), Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy.
Said components is specially: the Fe of Zr, 0.1-0.5wt% of Zn, 0.1-0.5wt% of Mn, 0.50-2.50wt% of 1.0-4.0wt%, surplus are Al and impurity; Content of impurities≤0.2wt%, wherein, impurity Si≤0.1wt%, impurity Cu≤0.1wt%.
Step 2 is dry: the raw material in step 1 is carried out drying treatment, wherein, fine aluminium ingot, pure zinc ingot are dried at 100 DEG C ± 10 DEG C temperature, Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy are dried at 150 DEG C ± 10 DEG C temperature, and the effect of oven dry is the moisture in order to remove in raw material.
Step 3 melting: first fine aluminium ingot is placed in smelting furnace and is heated to 780-800 DEG C, add Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy subsequently, and Keep agitation is until raw material all melts, be cooled to 700-730 DEG C afterwards, add pure zinc ingot, and Keep agitation is until raw material is all molten into melt, after leaving standstill 10-30min, whether inspection bath composition is qualified.
Step 4 refining: the object of refining removes the non-metallic inclusion in melt, when melt temperature is at 700-740 DEG C, by mode that is artificial or induction stirring, flux is pressed at the bottom of smelting furnace or by blowing inert gas to enter at the bottom of smelting furnace to carry out refining, refining time is 5-20min, completes melting after inspection bath composition is qualified.
The Main Function of flux is used to remove the gas in melt and slag, is a kind of degasification deslagging agent.Rare gas element is rare gas mainly, as helium, neon and argon gas etc.
Step 5 die casting: after melt qualified for composition in step 4 is cooled to 720-750 DEG C, die casting is preheated in the die cavity of mould of 200-300 DEG C to passing through, wherein, the melt flow of filling when type starts is 0.1-0.5m/s, casting pressure is 80-95MPa, fill type rate more than 70% after, the flow velocity improving melt is 90-120MPa to 1.5-3.0m/s, casting pressure, until fill the die casting that type die casting terminates to obtain complete densification.
Step 6: die casting timeliness step 5 obtained or anneal also carry out machining, finally carry out cleaning and chemical rightenning.
Wherein, aging condition is: temperature: 180 DEG C-220 DEG C, the time: insulation 8-16h, furnace cooling; Anneal condition is: temperature: 250 DEG C-300 DEG C, the time: insulation 8-16h, furnace cooling.
Step 7 anodic oxidation treatment: the die casting processed through step 6 is carried out anodic oxidation treatment, and its condition is: sulfuric acid 110-150g/L, citric acid 10-15g/L, lactic acid 5-8g/L, current density 1.2-1.6A/dm
2, voltage 12-16V, oxidization time 10-40min, carry out pure water cleaning after anodic oxidation completes.
Step 8: the die casting after step 7 anodic oxidation treatment is carried out dyeing sealing of hole, dyeing condition is: temperature: 40-60 DEG C, the time: 5-15min; Sealing of hole condition is: temperature: 80-95 DEG C, the time: 15-25min.
Aluminium diecast alloy provided by the invention, not only has good die casting performance but also can anode oxidation coloration.Its mechanism is:
1, the alloying element in aluminium diecast alloy of the present invention is simple, and impurity Si content is few, can not be formed be unfavorable for carrying out anodised Si particle and the composition of this aluminium diecast alloy close to fine aluminium, therefore, it is possible to anodic oxidation and coloring effect is good.
2, the present invention is by adding metallic element Mn, defines the Al higher than matrix fusing point with the Al in aluminium diecast alloy
6mn Particle Phase, dislocation glide when aluminium diecast alloy is stretched is subject to effective suppression, thus improves intensity and the die casting performance of aluminium diecast alloy, improves aluminium diecast alloy mobility.
3, the present invention is by adding metallic element Zn and Zr, not only can crystal grain thinning, can improve aluminium diecast alloy mobility simultaneously, improve the die casting performance of aluminium diecast alloy.
4, the present invention is by adding metallic element Fe, defines FeAl with Al
3phase, Mass is mutually tiny to be distributed in aluminum substrate, can hinder the growth of recrystal grain, effectively crystal grain thinning, improve aluminium diecast alloy intensity; Fe content there will be the phenomenon of the not easily demoulding lower than 0.1% simultaneously, affects production; And during Fe too high levels, reduce alloy flowability, the quality of infringement aluminium diecast alloy, shorten the life-span of metal assembly in die casting equipment.
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
The preparation method of the aluminium diecast alloy of the embodiment of the present invention 1, comprises the following steps:
A kind of aluminium diecast alloy, be prepared according to the step 1-5 described in embodiment, wherein, Mn:2.5wt%, Zn:1.5wt%, Zr:0.1wt%, Fe:0.3wt%, surplus is Al.Obtained aluminium diecast alloy A1.
Embodiment 2
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of Zr is 0.2wt%, obtained aluminium diecast alloy A2.
Embodiment 3
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of Zr is 0.3wt%, obtained aluminium diecast alloy A3.
Embodiment 4
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of Zr is 0.4wt%, obtained aluminium diecast alloy A4.
Embodiment 5
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of Zr is 0.5wt%, obtained aluminium diecast alloy A5.
Embodiment 6
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of the addition of Mn to be the addition of 1.0wt%, Zn be 2.5wt%, Fe is 0.1wt%, obtained aluminium diecast alloy A6.
Embodiment 7
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of the addition of Mn to be the addition of 4.0wt%, Zn be 0.5wt%, Fe is 0.5wt%, obtained aluminium diecast alloy A7.
Embodiment 8
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of the addition of Mn to be the addition of 1.0wt%, Zn be 0.5wt%, Fe is 0.1wt%, obtained aluminium diecast alloy A8.
Embodiment 9
Raw material and preparation method substantially the same manner as Example 1, difference is only: the addition of the addition of Mn to be the addition of 4.0wt%, Zn be 2.5wt%, Zr is the addition of 0.5wt%, Fe is 0.5wt%, obtained aluminium diecast alloy A9.
Comparative example 1
Comparative example 1 is for illustration of the aluminium diecast alloy not adding metallic element Zn, Zr and Fe, and all the other are identical with embodiment 1, obtained aluminium diecast alloy B1.
Performance test:
Chemical composition, strength property are tested:
Aluminium diecast alloy B1 prepared by the aluminium diecast alloy A1-A9 prepared by above-described embodiment 1-9 and comparative example 1 carries out chemical composition detection (ICP test), strength property test (being tested by omnipotent mechanics machine) respectively, the chemical composition detected result of the aluminium alloy obtained is in table 1, and strength property test result is in table 2.
Table 1 (massfraction wt%)
| Aluminium alloy moiety | Manganese (Mn) | Zinc (Zn) | Zirconium (Zr) | Iron (Fe) | Aluminium (Mg) |
| Comparative example B1 | 2.5 | 0 | 0 | 0 | Surplus |
| Embodiment A 1 | 2.5 | 1.5 | 0.1 | 0.3 | Surplus |
| Embodiment A 2 | 2.5 | 1.5 | 0.2 | 0.3 | Surplus |
| Embodiment A 3 | 2.5 | 1.5 | 0.3 | 0.3 | Surplus |
| Embodiment A 4 | 2.5 | 1.5 | 0.4 | 0.3 | Surplus |
| Embodiment A 5 | 2.5 | 1.5 | 0.5 | 0.3 | Surplus |
| Embodiment A 6 | 1.0 | 2.5 | 0.1 | 0.1 | Surplus |
| Embodiment A 7 | 4.0 | 0.5 | 0.1 | 0.5 | Surplus |
| Embodiment A 8 | 1.0 | 0.5 | 0.1 | 0.1 | Surplus |
| Embodiment A 9 | 4.0 | 2.5 | 0.5 | 0.5 | Surplus |
Table 2 (mechanical property)
| Yield strength (MPa) | Tensile strength (MPa) | Elongation after fracture (%) | Vickers' hardness (Hv) | |
| Comparative example B1 | 80 | 155 | 7.5 | 45 |
| Embodiment A 1 | 115 | 190 | 7.0 | 65 |
| Embodiment A 2 | 123 | 198 | 6.8 | 68 |
| Embodiment A 3 | 155 | 210 | 6.2 | 78 |
| Embodiment A 4 | 145 | 196 | 6.4 | 71 |
| Embodiment A 5 | 135 | 192 | 6.5 | 69 |
| Embodiment A 6 | 65 | 125 | 9.3 | 40 |
| Embodiment A 7 | 95 | 168 | 7.8 | 52 |
| Embodiment A 8 | 90 | 145 | 8.5 | 55 |
| Embodiment A 9 | 85 | 150 | 8.2 | 50 |
According to the mechanical performance data in table 2, can find out: after with the addition of metallic element Zn, Zr and Fe in aluminium diecast alloy, the mechanical property of aluminium diecast alloy promotes all to some extent, and wherein when Mn content be 2.5wt%, Zn content be 1.5wt%, Zr content be 0.3wt%, Fe content is 0.3wt%, aluminium diecast alloy shows best mechanical property.Therefore, the aluminium diecast alloy obtained by the present invention has good die casting performance.
Next anodic oxidation and coloring treatment technique that this type of aluminium diecast alloy carries out after die casting completes is described in detail:
First, by the foundry goods of casting forming, complete machining through timeliness or anneal, then carry out cleaning and chemical rightenning (namely method is thrown in typical three acidifyings); Then the sulphuric acid anodizing process in above-mentioned steps 5 can just be carried out; Finally can contaminate various colour, thus painted aluminium diecast alloy product can be obtained.
This painted aluminium diecast alloy is after coloring through 96 hours neutral salt spray tests, and surface luster is unchanged, then this aluminium diecast alloy has good anodic oxidation performance and good aesthetic property.Aluminium diecast alloy of the present invention not only erosion resistance and general ornamental in effect can match in excellence or beauty with surface-coated, with paint, electroplate compared with, there is the advantages such as technique is simple, cost is low, environmental pollution is little significantly.
The present invention can meet the requirement of modern large-scale production to foundry goods due to the combination of die casting, anodic oxidation and these technique specialities painted; the requirement of existing 3C Product appearance component can be met completely; replace traditional machining manufacture craft, significantly reduce manufacturing cost.Therefore, aluminium diecast alloy of the present invention has great application value.
The foregoing is only preferred embodiment of the present invention, be not used for limiting practical range of the present invention; If do not depart from the spirit and scope of the present invention, the present invention is modified or equivalent to replace, in the middle of the protection domain that all should be encompassed in the claims in the present invention.
Claims (10)
1. an aluminium diecast alloy, is characterized in that, it is made up of the component of following weight percent: the Fe of Zr, 0.1-0.5wt% of Zn, 0.1-0.5wt% of Mn, 0.50-2.50wt% of 1.0-4.0wt%, surplus are Al and impurity; And content of impurities≤0.2wt%, wherein, impurity Si≤0.1wt%, impurity Cu≤0.1wt%.
2. aluminium diecast alloy according to claim 1, is characterized in that, it is made up of the component of following weight percent: the Fe of Zr, 0.2-0.4wt% of Zn, 0.2-0.4wt% of Mn, 1.00-2.00wt% of 2.0-3.0wt%, surplus are Al and impurity.
3. aluminium diecast alloy according to claim 1 and 2, is characterized in that, it is made up of the component of following weight percent: the Fe of Zr, 0.3wt% of Zn, 0.3wt% of Mn, 1.5wt% of 2.5wt%, surplus are Al and impurity.
4. aluminium diecast alloy according to claim 1, is characterized in that, it is made up of the component of following weight percent: the Fe of Zr, 0.1wt% of Zn, 0.1wt% of Mn, 0.50wt% of 1.0wt%, surplus are Al and impurity.
5. aluminium diecast alloy according to claim 1, is characterized in that, it is made up of the component of following weight percent: the Fe of Zr, 0.5wt% of Zn, 0.5wt% of Mn, 2.50wt% of 4.0wt%, surplus are Al and impurity.
6. a preparation method for aluminium diecast alloy, is characterized in that, comprises the following steps:
Step 1 is got the raw materials ready: prepare the fine aluminium ingot of the formula ratio of component described in claim 1, pure zinc ingot, Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy;
Step 2 is dry: the raw material in step 1 is carried out drying treatment, and wherein, fine aluminium ingot, pure zinc ingot are dried at 100 DEG C ± 10 DEG C temperature, and Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy are dried at 150 DEG C ± 10 DEG C temperature;
Step 3 melting: first fine aluminium ingot is placed in smelting furnace and is heated to 780-800 DEG C, add Al-Mn master alloy, Al-Zr master alloy and Al-Fe master alloy subsequently, and Keep agitation is until raw material all melts, be cooled to 700-730 DEG C afterwards, add pure zinc ingot, and Keep agitation is until raw material is all molten into melt, after leaving standstill 10-30min, whether inspection bath composition is qualified;
Step 4 refining: when melt temperature is at 700-740 DEG C, by mode that is artificial or induction stirring, flux is pressed at the bottom of smelting furnace or by blowing inert gas to enter at the bottom of smelting furnace to carry out refining, refining time is 5-20min, completes melting after inspection bath composition is qualified;
Step 5 die casting: after melt qualified for composition in step 4 is cooled to 720-750 DEG C, die casting is preheated in the die cavity of mould of 200-300 DEG C to passing through, wherein, the melt flow of filling when type starts is 0.1-0.5m/s, casting pressure is 80-95MPa, fill type rate more than 70% after, the flow velocity improving melt is 90-120MPa to 1.5-3.0m/s, casting pressure, terminates to obtain die casting until fill type die casting;
Step 6 anodic oxidation treatment: the die casting in step 5 is carried out anodic oxidation treatment, its condition is: sulfuric acid 110-150g/L, citric acid 10-15g/L, lactic acid 5-8g/L, current density 1.2-1.6A/dm
2, voltage 12-16V, oxidization time 10-40min.
7. the preparation method of aluminium diecast alloy according to claim 6, is characterized in that, also comprises described die casting timeliness or anneal and carry out machining between described step 5 and step 6, finally carries out cleaning the step with chemical rightenning.
8. the preparation method of the aluminium diecast alloy according to claim 6 or 7, is characterized in that, also comprise after step 6 and described die casting is carried out dyeing sealing of hole, dyeing condition is: temperature: 40-60 DEG C, the time: 5-15min; Sealing of hole condition is: temperature: 80-95 DEG C, the time: 15-25min.
9. the preparation method of aluminium diecast alloy according to claim 6, is characterized in that, the purity >=99.9wt% of the fine aluminium ingot in described step 1, the purity >=99.9wt% of pure zinc ingot.
10. the preparation method of aluminium diecast alloy according to claim 7, is characterized in that, aging condition is: temperature: 180 DEG C-220 DEG C, the time: insulation 8-16h, furnace cooling; Anneal condition is: temperature: 250 DEG C-300 DEG C, the time: insulation 8-16h, furnace cooling.
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| CN105666061A (en) * | 2016-03-22 | 2016-06-15 | 宁波旭升汽车技术股份有限公司 | Preparation process for radiator good in sealing performance |
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