CN107937765B - A kind of high-strength anti-corrosion die-casting aluminium alloy and its pressure casting method - Google Patents
A kind of high-strength anti-corrosion die-casting aluminium alloy and its pressure casting method Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 72
- 238000005260 corrosion Methods 0.000 title claims abstract description 42
- 238000004512 die casting Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005266 casting Methods 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 159
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 158
- 239000012535 impurity Substances 0.000 claims abstract description 35
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 26
- 239000010703 silicon Substances 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 238000007670 refining Methods 0.000 claims abstract description 17
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 12
- 239000004615 ingredient Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000007872 degassing Methods 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 36
- 239000011777 magnesium Substances 0.000 claims description 35
- 239000002994 raw material Substances 0.000 claims description 34
- 239000004411 aluminium Substances 0.000 claims description 27
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 13
- 229910052737 gold Inorganic materials 0.000 claims description 13
- 239000010931 gold Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 abstract description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 23
- 238000005275 alloying Methods 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 29
- 230000000052 comparative effect Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 230000005496 eutectics Effects 0.000 description 8
- 229910018566 Al—Si—Mg Inorganic materials 0.000 description 6
- ZBZJXHCVGLJWFG-UHFFFAOYSA-N trichloromethyl(.) Chemical compound Cl[C](Cl)Cl ZBZJXHCVGLJWFG-UHFFFAOYSA-N 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910018191 Al—Fe—Si Inorganic materials 0.000 description 2
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 1
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 1
- 241000555268 Dendroides Species 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 208000030303 breathing problems Diseases 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229960000935 dehydrated alcohol Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 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
- 239000007791 liquid phase Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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Abstract
A kind of high-strength anti-corrosion die-casting aluminium alloy and its pressure casting method, its ingredient and mass percent are as follows: Si 9.6~10.4%, Mg0.4~0.6%, Fe 0.3~0.5%, Ti 0.1~0.3%, Tc 0.01~0.03%, B 0.002~0.006%, Ba 0.01~0.03%, Ge 0.005~0.015%, remaining is Al and inevitable impurity.Its pressure casting method is the following steps are included: ingredient, smelting aluminium alloy liquid, refining degasification slagging-off, addition grain refiner, Fe-riched phase alterant and silicon phase alterant, stirring and casting forming.The present invention, by microalloy treatment fine degenerate richness Fe phase, common reciever and primary Si phase, improves the intensity and plasticity of pack alloy on the basis of optimizing Si, Mg main alloying element.Pack alloy of the present invention is suitable for that casting forming is various to seek higher aluminum alloy spare part to intensity, plasticity and corrosion resistance.
Description
Technical field
The invention belongs to aluminium alloy compression casting field, it is specifically related to a kind of high-strength anti-corrosion die-casting aluminium alloy and its die casting side
Method.
Background technique
Al-Si-Mg series die-casting alloy aluminum belongs to hypoeutectic al-si alloy, due to being free of Cu element, thus has excellent
The features such as corrosion resistance and preferable heat crack resistance, air-tightness and mobility, it is multiple to be widely used in receiving underload, shape
Miscellaneous thin-walled die casting components, such as various instrument housings, automobile casing, gear box oil pump case, car wheel cover, crankshaft of motorcycle
Case, cycle wheel etc..With the light-weighted development of the vehicles such as automobile, motorcycle, aluminum alloy die casting is constantly to thin-walled
Change development, this requires pack alloy to have higher intensity and moulding.Although existing Al-Si-Mg series die-casting alloy aluminum has
The features such as excellent corrosion resistance and preferable heat crack resistance, air-tightness and mobility, but the general relatively low, moulding of intensity compared with
The problem of difference becomes increasingly conspicuous, and significantly limits the application of Al-Si-Mg series die-casting alloy aluminum.
The poor reason of existing Al-Si-Mg series die-casting alloy aluminum low strength, plasticity, is the Fe of pack alloy first
Content is higher, and Fe is usually in the form of coarse needle-shaped Al-Fe-Si system richness Fe phase in aluminium alloy there are in alloy matrix aluminum,
This coarse needle-shaped richness Fe phase itself belongs to hard and crisp intermetallic compound phase, can seriously isolate aluminum substrate, becomes aluminium conjunction
The formation of crack and direction of crack propagation of golden forced breakage.Followed by although Al-Si-Mg series die-casting alloy aluminum belongs to hypoeutectic aluminium silicon
Alloy, but Si content is higher, and Si is with coarse there are also small part Si other than existing in the form of needle-shaped eutectic Si in aluminium alloy
Blocky primary silicon form exists, and needle-shaped eutectic Si and coarse blocky primary Si phase belong to hard crisp phase, equally can seriously isolate aluminium
Matrix reduces the intensity and plasticity of aluminium alloy.Therefore, existing Al-Si-Mg series die-casting alloy aluminum and its pressure casting method still need to be changed
Into and development.
Summary of the invention
It is an object of the invention to there are problem and shortage, provided for above-mentioned a kind of high-strength anti-corrosion die-casting aluminium alloy and its
Pressure casting method improves the strong of pack alloy by microalloy treatment fine degenerate richness Fe phase, common reciever and primary Si phase
Degree and plasticity meet various to intensity, plasticity and the more demanding aluminum alloy die casting needs of corrosion resistance.
The technical scheme of the present invention is realized as follows:
High-strength anti-corrosion die-casting aluminium alloy of the present invention, its main feature is that by following mass percent at being grouped as: Si
9.6~10.4%, Mg 0.4~0.6%, Fe 0.3~0.5%, Ti 0.1~0.3%, Tc 0.01~0.03%, B 0.002
~0.006%, Ba 0.01~0.03%, Ge 0.005~0.015%, remaining is Al and inevitable impurity, wherein Tc
Mass ratio with B is that the mass ratio of 5:1, Ba and Ge are 2:1, inevitable single content≤0.05% of impurity, total impurities
≤ 0.15%.
The pressure casting method of high-strength anti-corrosion die-casting aluminium alloy of the present invention, its main feature is that the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 700~740 DEG C of heating, it is added and accounts for the speed that raw material total weight is 9.6~10.4%
Molten silicon, 0.4~0.6% magnesium ingot and 0.5~1.5% Al20Fe alloy, stirring are fused into aluminum alloy melt；
Step 3: being added and accounting for raw material total weight is 1~3% after carrying out refining degasification slagging-off to aluminum alloy melt
Al10Ti alloy, 0.2~0.6% Al5Tc1B alloy, 0.2~0.6% Al5Ba alloy and 0.1~0.3% Al5Ge close
Gold, the ingredient that stirring enables aluminum alloy to liquid are uniform；
Step 4: 680~700 DEG C of pouring temperature, 190~210 DEG C of cavity temperature, 2.1~2.4 meter per second of injection speed,
30~50MPa of injection ratio pressure and aluminum alloy melt is cast into aluminium alloy under the conditions of 3~8 seconds dwell times, is obtained after cooling high-strength
Ruselite.
Compared with prior art, the invention has the following advantages:
(1) present invention passes through the rotten richness of addition Al5Tc1B alloy refinement on the basis of optimizing Si, Mg main alloying element
The rotten eutectic Si of Fe phase, compound addition Al5Ba alloy and Al5Ge alloy refinement and primary Si phase, improve the strong of pack alloy
Degree and plasticity.
(2) after the present invention is by refining degasification slagging-off, Al10Ti, Al5Tc1B, Al5Ba alloy is added and Al5Ge is closed
Gold is conducive to give full play to Ti, Tc, B, Ba, Ge element to the refining effect of α-Al crystal grain and to the refinement change of rich Fe phase, Si phase
Matter effect, it is ensured that pack alloy obtains high intensity and plasticity.
(3) the room temperature tensile intensity of pack alloy of the present invention is greater than 250MPa, and elongation is greater than 8%, and corrosion rate is small
In 2 × 10-3/mg·cm-2·h-1, meet various to intensity, plasticity and the more demanding aluminum alloy die casting need of corrosion resistance
It wants.
Specific embodiment
Below to high-strength anti-corrosion die-casting aluminium alloy of the present invention at be grouped as meaning and content range restriction reason into
Row explanation.
High-strength anti-corrosion die-casting aluminium alloy of the present invention, its main feature is that by following mass percent at being grouped as: Si
9.6~10.4%, Mg 0.4~0.6%, Fe 0.3~0.5%, Ti 0.1~0.3%, Tc 0.01~0.03%, B 0.002
~0.006%, Ba 0.01~0.03%, Ge 0.005~0.015%, remaining is Al and inevitable impurity, wherein Tc
Mass ratio with B is that the mass ratio of 5:1, Ba and Ge are 2:1, inevitable single content≤0.05% of impurity, total impurities
≤ 0.15%.
Si can form Al+Si eutectic liquid phase with Al in pack alloy, improve the mobility of pack alloy, simultaneously also
The machining property of pack alloy can be improved.Si content is higher, and the mobility and machining property of pack alloy are all
It is better, but the plasticity of pack alloy can be gradually reduced.Si content is lower than 9.6%, the illiquidity of pack alloy, it is difficult to
Meet the die-casting process requirement of shape and structure complex parts.When Si content is more than 10.4%, the plasticity of pack alloy can go out
Now it is remarkably decreased.Therefore, in order to guarantee that pack alloy has enough mobility and plasticity, the selection of Si content 9.6~
10.4%.
Mg can form Mg in pack alloy2The intensity of Si hardening constituent enhancing aluminium alloy.Mg content is higher, and die casting aluminium closes
The intensity of gold is also higher, but the plasticity of pack alloy can be gradually reduced.Mg content is lower than 0.4%, the intensity of pack alloy
250MPa is not achieved.And Mg content can be substantially reduced the moulding of pack alloy, elongation is not achieved 7% when being more than 0.6%.
Therefore, in order to ensure pack alloy obtains enough intensity and plasticity, Mg content is selected 0.4~0.6%.
Effect of the Fe in pack alloy mainly prevents die casting sticking to mould, is conducive to die casting demoulding.Fe content is got over
Height is more conducive to the demoulding of pack alloy part.Fe is inevitable impurity element in aluminium ingot, the aluminium ingot that purity is 99.7%
Usually contain 0.2% Fe.But Fe exists usually in the form of coarse needle-shaped Al-Fe-Si system richness Fe phase in pack alloy,
This coarse needle-shaped richness Fe phase itself belongs to crisp and hard intermetallic compound, can seriously isolate aluminum substrate, becomes die casting aluminium conjunction
The formation of crack and direction of crack propagation of golden forced breakage, this is the weight for causing existing pack alloy low strength, plasticity poor
Want reason.In addition, the Fe in pack alloy is easy to be formed with Al from electrochemical corrosion is coupled, the corrosion resistant of pack alloy is reduced
Corrosion energy.But when rich Fe phase fine degenerate is the graininess of fine uniform, then it can eliminate rich Fe relative intensity and plasticity
It influences, and the corrosion resistance of pack alloy can also be improved.Comprehensively consider release property, the mechanical property of pack alloy
With the factors such as corrosion resistance, therefore, Fe content is selected 0.3~0.5%.
Ti primarily serves the effect of refinement α-Al crystal grain in pack alloy, and the structural constituent for improving pack alloy is equal
Even property improves the intensity and plasticity of pack alloy.For Ti content less than 0.1%, grain refining effect is unobvious.Ti content is got over
Height, grain refining effect are better.The Ti of addition 0.1~0.3%, can make the α-Al crystal grain of pack alloy from coarse dendroid
Be refined as fine uniform etc. shaft-like, improve the structural constituent uniformity of pack alloy, improve pack alloy intensity and
Plasticity.Therefore, the selection of Ti content is 0.1~0.3%.
Tc, B main function in pack alloy are fine degenerate richness Fe phases.Inventor passes through many experiments exploratory development
After find, 0.01~0.03% Tc element of compound addition and 0.002~0.006% B element, and the mass ratio of Tc and B is
When 5:1, in the process of setting of pack alloy, it effectively can inhibit and change richness Fe phase by the reciprocation of Tc and B
The orientation of growth makes rich Fe phase from the graininess of coarse needle-shaped fine degenerate fine uniform, to eliminate coarse needle-shaped richness Fe
The influence of opposite pack alloy intensity and plasticity, improves the intensity and plasticity of pack alloy.
The effect of Ba, Ge in pack alloy is mainly fine degenerate eutectic Si and primary Si phase.The prior art is usual
Using Na, Sr come fine degenerate common reciever, using P element come fine degenerate primary Si phase.But Na, Sr fine degenerate are easy to draw
Send out aluminum alloy melt air-breathing, and fine degenerate of the P to primary Si phase that there is also effects at present is unstable, burning easy to oxidize and lose
The problem of.Inventor has found that Ba element has the common reciever of pack alloy of the present invention after passing through many experiments exploratory development
There is good fine degenerate effect, effect is significantly better than existing Na, Sr element, there is not yet and causes aluminum alloy melt air-breathing
Problem.And Ge has stable fine degenerate effect to primary silicon, the problem of loss there is no oxidizing fire.When compound addition
The Ge of 0.01~0.03% Ba and 0.005~0.015%, the and when mass ratio of Ba and Ge is 2:1, can be to eutectic Si and nascent
Si carries out sufficient fine degenerate, so that needle-shaped eutectic Si and coarse blocky primary silicon is changed into small uniform graininess Si phase, disappears
Influence except needle-shaped eutectic Si and coarse blocky primary silicon to pack alloy intensity and plasticity, improves the intensity of pack alloy
And plasticity.
The pressure casting method of high-strength anti-corrosion die-casting aluminium alloy of the present invention is illustrated below.
The pressure casting method of high-strength anti-corrosion die-casting aluminium alloy of the present invention, its main feature is that the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 700~740 DEG C of heating, it is added and accounts for the speed that raw material total weight is 9.6~10.4%
Molten silicon, 0.4~0.6% magnesium ingot and 0.5~1.5% Al20Fe alloy, stirring are fused into aluminum alloy melt；
Step 3: being added and accounting for raw material total weight is 1~3% after carrying out refining degasification slagging-off to aluminum alloy melt
Al10Ti alloy, 0.2~0.6% Al5Tc1B alloy, 0.2~0.6% Al5Ba alloy and 0.1~0.3% Al5Ge close
Gold, the ingredient that stirring enables aluminum alloy to liquid are uniform；
Step 4: 680~700 DEG C of pouring temperature, 190~210 DEG C of cavity temperature, 2.1~2.4 meter per second of injection speed,
30~50MPa of injection ratio pressure and aluminum alloy melt is cast into aluminium alloy under the conditions of 3~8 seconds dwell times, is obtained after cooling high-strength
Ruselite.
The elements such as Mn, Ni, Zn, Sn, Pb are aluminium ingot, inevitable impurity element in instant silicon, these impurity elements exist
It will form hard and crisp or low melting point intermetallic compound in pack alloy, easily become splitting for pack alloy forced breakage
Line source and direction of crack propagation deteriorate the intensity and plasticity of pack alloy.In addition, these impurity elements are in pack alloy
It is easy to be formed with Al from electrochemical corrosion is coupled, reduces the corrosion resistance of pack alloy.Therefore, these impurity elements are necessary
Carry out strict control.The present invention by select purity be 99.7% aluminium ingot, 99.9% instant silicon and 99.95 magnesium ingot conduct
Main raw material(s), single content≤0.05% of the impurity elements such as controllable Mn, Ni, Zn, Sn, Pb, total impurities≤0.15%,
Ensure that pack alloy obtains high intensity, plasticity and corrosion resistance.
Ti, Tc, Ba, Ge belong to micro alloying element in pack alloy of the present invention, if before refining degasification slagging-off
These elements are added, loss is easy to happen in refining degasification slag removal, does not have corresponding fine degenerate effect.And it is refining
Add Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy after degasification slagging-off, be conducive to give full play to Ti,
Tc, Ba, Ge element act on the fine degenerate of α-Al crystal grain, richness Fe phase and Si phase, it is ensured that pack alloy obtain high intensity,
Plasticity and corrosion resistance.
Below with reference to specific embodiment and comparative example, further description of the technical solution of the present invention, so as to more preferable
Understanding technical solution of the present invention.
Embodiment 1:
Pack alloy is by following mass percent at being grouped as: Si 9.6%, Mg 0.4%, Fe 0.3%, Ti
0.1%, Tc 0.01%, B 0.002%, Ba 0.01%, Ge 0.005%, remaining is Al and inevitable impurity, can not
Single content≤0.05% of the impurity avoided, total impurities≤0.15%.The pressure casting method of pack alloy the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 740 DEG C of heating, the instant silicon, 0.4% for accounting for that raw material total weight is 9.6% is added
Magnesium ingot and 0.5% Al20Fe alloy, stirring be fused into aluminum alloy melt；
Step 3: with account for raw material total weight be 0.5% carbon trichloride refining slagging-off is carried out to aluminum alloy melt after, be added
Account for raw material total weight be 1% Al10Ti alloy, 0.2% Al5Tc1B alloy, 0.2% Al5Ba alloy and 0.1%
Al5Ge alloy, the ingredient that stirring enables aluminum alloy to liquid are uniform；
Step 4: 700 DEG C of pouring temperature, 190 DEG C of cavity temperature, 2.1 meter per second of injection speed, injection ratio pressure 50MPa and
Aluminum alloy melt is cast into aluminium alloy under the conditions of 8 seconds dwell times, obtains high-strength anti-corrosion die-casting aluminium alloy after cooling.
Embodiment 2:
Pack alloy is by following mass percent at being grouped as: Si 10%, Mg 0.5%, Fe 0.4%, Ti
0.2%, Tc 0.02%, B 0.004%, Ba 0.02%, Ge 0.01%, remaining is Al and inevitable impurity, can not be kept away
Single content≤0.05% of the impurity exempted from, total impurities≤0.15%.The pressure casting method of pack alloy the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 720 DEG C of heating, the instant silicon, 0.5% for accounting for that raw material total weight is 10% is added
Magnesium ingot and 1% Al20Fe alloy, stirring be fused into aluminum alloy melt；
Step 3: with account for raw material total weight be 0.5% carbon trichloride refining slagging-off is carried out to aluminum alloy melt after, be added
Account for raw material total weight be 2% Al10Ti alloy, 0.4% Al5Tc1B alloy, 0.4% Al5Ba alloy and 0.2%
Al5Ge alloy, the ingredient that stirring enables aluminum alloy to liquid are uniform；
Step 4: 690 DEG C of pouring temperature, 200 DEG C of cavity temperature, 2.3 meter per second of injection speed, injection ratio pressure 40MPa and
Aluminum alloy melt is cast into aluminium alloy under the conditions of 5 seconds dwell times, obtains high-strength anti-corrosion die-casting aluminium alloy after cooling.
Embodiment 3:
Pack alloy is by following mass percent at being grouped as: Si 10.4%, Mg 0.6%, Fe 0.5%, Ti
0.3%, Tc0.03%, B 0.006%, Ba 0.03%, Ge 0.015%, remaining is Al and inevitable impurity, can not be kept away
Single content≤0.05% of the impurity exempted from, total impurities≤0.15%.The pressure casting method of pack alloy the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 700 DEG C of heating, the instant silicon, 0.6% for accounting for that raw material total weight is 10.4% is added
Magnesium ingot and 1.5% Al20Fe alloy, stirring be fused into aluminum alloy melt；
Step 3: with account for raw material total weight be 0.5% carbon trichloride refining slagging-off is carried out to aluminum alloy melt after, be added
Account for raw material total weight be 3% Al10Ti alloy, 0.6% Al5Tc1B alloy, 0.6% Al5Ba alloy and 0.3%
Al5Ge alloy, the ingredient that stirring enables aluminum alloy to liquid are uniform；
Step 4: 680 DEG C of pouring temperature, 210 DEG C of cavity temperature, 2.4 meter per second of injection speed, injection ratio pressure 30MPa and
Aluminum alloy melt is cast into aluminium alloy under the conditions of 3 seconds dwell times, obtains high-strength anti-corrosion die-casting aluminium alloy after cooling.
Comparative example 1
Pack alloy is by following mass percent at being grouped as: Si 10%, Mg 0.5%, Fe 0.4%, Ti
0.2%, remaining is Al and inevitable impurity, inevitable single content≤0.05% of impurity, total impurities≤
0.15%.The pressure casting method of pack alloy the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold and Al10Ti alloy are raw material；
Step 2: aluminium ingot is melted in 720 DEG C of heating, the instant silicon, 0.5% for accounting for that raw material total weight is 10% is added
Magnesium ingot and 1% Al20Fe alloy, stirring be fused into aluminum alloy melt；
Step 3: with account for raw material total weight be 0.5% carbon trichloride refining slagging-off is carried out to aluminum alloy melt after, be added
The Al10Ti alloy that raw material total weight is 2% is accounted for, the ingredient that stirring enables aluminum alloy to liquid is uniform；
Step 4: 690 DEG C of pouring temperature, 200 DEG C of cavity temperature, 2.3 meter per second of injection speed, injection ratio pressure 40MPa and
Aluminum alloy melt is cast into aluminium alloy under the conditions of 5 seconds dwell times.
Comparative example 2
Pack alloy is by following mass percent at being grouped as: Si 10%, Mg 0.5%, Fe 0.4%, Ti
0.2%, Ba 0.02%, Ge 0.01%, remaining is Al and inevitable impurity, the inevitable single content of impurity≤
0.05%, total impurities≤0.15%.The pressure casting method of pack alloy the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 720 DEG C of heating, the instant silicon, 0.5% for accounting for that raw material total weight is 10% is added
Magnesium ingot and 1% Al20Fe alloy, stirring be fused into aluminum alloy melt；
Step 3: with account for raw material total weight be 0.5% carbon trichloride refining slagging-off is carried out to aluminum alloy melt after, be added
Account for raw material total weight be 2% Al10Ti alloy, 0.4% Al5Ba alloy and 0.2% Al5Ge alloy, stirring close aluminium
The ingredient of golden liquid is uniform；
Step 4: 690 DEG C of pouring temperature, 200 DEG C of cavity temperature, 2.3 meter per second of injection speed, injection ratio pressure 40MPa and
Aluminum alloy melt is cast into aluminium alloy under the conditions of 5 seconds dwell times.
Comparative example 3
Pack alloy is by following mass percent at being grouped as: Si 10%, Mg 0.5%, Fe 0.4%, Ti
0.2%, Tc 0.02%, B 0.004%, remaining is Al and inevitable impurity, the inevitable single content of impurity≤
0.05%, total impurities≤0.15%.The pressure casting method of pack alloy the following steps are included:
Step 1: aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe that purity is 99.7% is selected to close
Gold, Al10Ti alloy and Al5Tc1B alloy are raw material；
Step 2: aluminium ingot is melted in 720 DEG C of heating, the instant silicon, 0.5% for accounting for that raw material total weight is 10% is added
Magnesium ingot and 1% Al20Fe alloy, stirring be fused into aluminum alloy melt；
Step 3: with account for raw material total weight be 0.5% carbon trichloride refining slagging-off is carried out to aluminum alloy melt after, be added
Accounting for raw material total weight is 2% Al10Ti alloy and 0.4% Al5Tc1B alloy, and the ingredient that stirring enables aluminum alloy to liquid is uniform；
Step 4: 690 DEG C of pouring temperature, 200 DEG C of cavity temperature, 2.3 meter per second of injection speed, injection ratio pressure 40MPa and
Aluminum alloy melt is cast into aluminium alloy under the conditions of 5 seconds dwell times.
By National Standard of the People's Republic of China GB/T 228-1987 " metal tensile test method ", by embodiment 1-3 and
The pack alloy of comparative example 1-3 is processed into standard tensile specimen, and room temperature drawing is carried out on DNS200 type electronic tensile test machine
It stretches, rate of extension is 2 mm/mins, and the results are shown in Table 1.By National Standard of the People's Republic of China GB/10134-2011,
The pack alloy of embodiment 1-3 and comparative example 1-3 are processed into the cylindric sample of 20mm × 5mm, passed through before experiment
No. 2000 waterproof abrasive paper milled processeds weigh the quality of sample as first prothyl after using acetone and washes of absolute alcohol and drying
Amount, experiment corrosive medium use 3.5%NaCl solution, and pH value controls 7~7.5, corrosion sample is hung in corrosive medium
It impregnates for 24 hours, in chromic acid (the 200mg CrO of boiling3/L+10mg AgNO3) in clean 5min, then again with acetone dehydrated alcohol it is clear
It after washing and being dry, is weighed with assay balance, calculates corrosion rate: V=(W1-W2) × t/A, in formula, V is the corrosion speed of sample
Rate, W1 are the quality before sample corrodes, and W2 is the quality after sample corrosion, and A is the area of sample, and t is the time of corrosion,
Corrosion rate is as shown in table 1.
The tensile mechanical properties and corrosion rate of 1 embodiment and comparative example pack alloy of table
| Tensile strength/MPa | Elongation/% | Corrosion rate × 10-3/mg·cm-2·h-1 | |
| Embodiment 1 | 254.7 | 9.5 | 1.94 |
| Embodiment 2 | 266.3 | 8.7 | 1.81 |
| Embodiment 3 | 278.5 | 8.3 | 1.67 |
| Comparative example 1 | 190.8 | 2.4 | 2.61 |
| Comparative example 2 | 231.5 | 4.1 | 2.35 |
| Comparative example 3 | 218.2 | 3.7 | 2.18 |
See from table 1, the room temperature tensile intensity of the pack alloy of 1-3 of the embodiment of the present invention is greater than 250MPa, elongation
Greater than 8%, corrosion rate is less than 2 × 10-3/mg·cm-2·h-1.The pack alloy of comparative example 1, due to do not have add Tc, B,
Ba, Ge element carry out fine degenerate processing with Si phase to rich Fe phase, and the room temperature tensile intensity of pack alloy is 190.8MPa, is stretched
Long rate is 2.4%, and corrosion rate is 2.61 × 10-3/mg·cm-2·h-1.The pack alloy of comparative example 2, due to not adding
Tc, B element carry out fine degenerate processing to rich Fe phase, and the room temperature tensile intensity of pack alloy is 231.5MPa, and elongation is
4.1%, corrosion rate is 2.35 × 10-3/mg·cm-2·h-1.The pack alloy of comparative example 3, due to not having to add Ba, Ge
Element carries out fine degenerate processing to Si phase, and the room temperature tensile intensity of pack alloy is 218.2MPa, elongation 3.7%,
Corrosion rate is 2.18 × 10-3/mg·cm-2·h-1.By comparing it can be seen that, pack alloy of the present invention by addition Tc,
B, Ba, Ge element carry out fine degenerate processing with Si phase to rich Fe phase, are remarkably improved the intensity of pack alloy, plasticity and resistance to
Corrosive nature.
The present invention is to be described by embodiment, but do not limit the invention, referring to description of the invention, institute
Other variations of disclosed embodiment, are such as readily apparent that the professional person of this field, such variation should belong to
Within the scope of the claims in the present invention limit.
Claims (1)
1. a kind of high-strength anti-corrosion die-casting aluminium alloy, it is characterised in that: the pack alloy is by following mass percent at grouping
At: Si 9.6~10.4%, Mg 0.4~0.6%, Fe 0.3~0.5%, Ti 0.1~0.3%, Tc 0.01~0.03%, B
0.002~0.006%, Ba 0.01~0.03%, Ge 0.005~0.015%, remaining is Al and inevitable impurity,
In, the mass ratio of Tc and B are that the mass ratio of 5:1, Ba and Ge are 2:1, inevitable single content≤0.05% of impurity, impurity
Total amount≤0.15%；The high-strength anti-corrosion die-casting aluminium alloy is obtained by following pressure casting method, and the pressure casting method includes following
Step:
Step 1: select purity be 99.7% aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot and Al20Fe alloy,
Al10Ti alloy, Al5Tc1B alloy, Al5Ba alloy and Al5Ge alloy are raw material；
Step 2: aluminium ingot is melted in 700~740 DEG C of heating, be added account for raw material total weight be 9.6~10.4% it is instant
Silicon, 0.4~0.6% magnesium ingot and 0.5~1.5% Al20Fe alloy, stirring are fused into aluminum alloy melt；
Step 3: the Al10Ti conjunction for accounting for that raw material total weight is 1~3% is added after carrying out refining degasification slagging-off to aluminum alloy melt
Gold, 0.2~0.6% Al5Tc1B alloy, 0.2~0.6% Al5Ba alloy and 0.1~0.3% Al5Ge alloy, stirring
The ingredient for enabling aluminum alloy to liquid is uniform；
Step 4: in 680~700 DEG C of pouring temperature, 190~210 DEG C of cavity temperature, 2.1~2.4 meter per second of injection speed, injection
It is cast into aluminium alloy than 30~50MPa of pressure and by aluminum alloy melt under the conditions of 3~8 seconds dwell times, obtains high strength anti-corrosion after cooling
Pack alloy.
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| JPS6238796A (en) * | 1985-08-10 | 1987-02-19 | Furukawa Alum Co Ltd | Sheet for vacuum brazing |
| EP0489427A1 (en) * | 1990-12-05 | 1992-06-10 | Sumitomo Metal Industries, Ltd. | Surface-coated aluminum material |
| CN103469020A (en) * | 2013-08-12 | 2013-12-25 | 安徽盛达前亮铝业有限公司 | Low-expansion aluminum alloy section material and preparation method thereof |
| CN104946940A (en) * | 2014-03-27 | 2015-09-30 | 比亚迪股份有限公司 | Die casting aluminum alloy and preparation method thereof |
| CN106591643A (en) * | 2017-01-15 | 2017-04-26 | 丹阳荣嘉精密机械有限公司 | High mechanical property die-casting aluminum alloy and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6238796A (en) * | 1985-08-10 | 1987-02-19 | Furukawa Alum Co Ltd | Sheet for vacuum brazing |
| EP0489427A1 (en) * | 1990-12-05 | 1992-06-10 | Sumitomo Metal Industries, Ltd. | Surface-coated aluminum material |
| CN103469020A (en) * | 2013-08-12 | 2013-12-25 | 安徽盛达前亮铝业有限公司 | Low-expansion aluminum alloy section material and preparation method thereof |
| CN104946940A (en) * | 2014-03-27 | 2015-09-30 | 比亚迪股份有限公司 | Die casting aluminum alloy and preparation method thereof |
| CN106591643A (en) * | 2017-01-15 | 2017-04-26 | 丹阳荣嘉精密机械有限公司 | High mechanical property die-casting aluminum alloy and preparation method thereof |
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