CN108913956A - A kind of Al-Mg-Si-Cu-Mn-Sr alloy and preparation method thereof with excellent anticorrosive performance - Google Patents
A kind of Al-Mg-Si-Cu-Mn-Sr alloy and preparation method thereof with excellent anticorrosive performance Download PDFInfo
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Abstract
The invention discloses a kind of Al-Mg-Si-Cu-Mn-Sr alloy with excellent anticorrosive performance, the alkaline-earth metal Sr for being 0.06%-0.09% containing mass percent.The present invention is by joined Sr element into Al-Mg-Si-Cu-Mn alloy, rationally design other alloying element contents, and use reasonable smelting technology, flash set technology, and repeat-rolling and suitable heat treatment are carried out, prepare the Al-Mg-Si-Cu-Mn-Sr alloy material that microscopic structure is uniform, crystal grain is tiny；Present invention alloy material obtained has preferable mechanical property and corrosion resistance, tensile strength sigmab>=395Mpa, elongation percentage δ >=17%, anti-strip corrosion class are PC grades, intercrystalline corrosion depth capacity≤180 μm；And present invention process process is simple, low in cost, comprehensive performance is superior.
Description
Technical field
The invention belongs to non-ferrous metal technical fields, and in particular to a kind of Al-Mg-Si-Cu-Mn-Sr alloy and its preparation
Method.
Background technique
Aluminium is the most abundant metal of present on earth, and aluminium and aluminium alloy are widely used.It is compared with other metal materials, aluminium closes
Fitting has a series of good characteristic.Wherein, 6000 series alloys are heat-treatable strengthened wrought aluminium alloys, are had medium
Intensity, good weldability and corrosion resistance etc., use scope is wide, especially the fields such as space flight and aviation, communications and transportation and building
It is used widely.Fine aluminium is relatively anti-corrosion, however its intensity is but very low.Alloy is carried out using elements such as Mg, Si, Cu
The aluminium alloy of change compromises the plasticity and corrosion resistance of alloy though intensity is improved, under nature hygrothermal environment easily
Corrode, seriously affects the higher aluminium alloy manufacture of the safety of materials'use service life and application, especially amount containing Cu
Intercrystalline corrosion phenomenon easily occurs for components, and this corrosion is destructive stronger a kind of local corrosion in aluminium alloy, it makes crystalline substance
Interparticle cohesion greatly weakens, or even completely disappears the mechanical strength of material, so improving Al-Mg-Si-Cu aluminium alloy
Corrosive nature has very important significance.The research of corrosive nature in relation to aluminium alloy is common in the alloy of 2xxx and 7xxx,
And the research of the corrosive nature about the 6xxx aluminium alloy being most widely used then rarely has report.
Studies have shown that the addition of the elements such as denier Zr, Sr, Sc can significantly change the forming core of aluminium alloy and precipitate
Journey not only can control grain structure, can also eliminate the adverse effect of Fe, Si in alloy, be conducive to improve the property that this is alloy
Energy.Sr is microelement widely distributed in nature, and in foundary industry, Sr is often used as the rotten of A1-Si casting alloy
Agent, improves the mechanical performance and casting character of casting, therefore is widely used.But in Al-Mg-Si wrought aluminium alloy
The research of microalloying Sr is so far still seldom.
Summary of the invention
The purpose of the present invention is to provide a kind of novel Al-Mg-Si-Cu-Mn-Sr alloys, to which Al- can be improved
The corrosion resistance of Mg-Si-Cu system alloy better meets demand of the fields such as auto industry to high-performance aluminium alloy.
The purpose of the present invention is achieved through the following technical solutions：
The present invention has the Al-Mg-Si-Cu-Mn-Sr alloy of excellent anticorrosive performance, it is characterized in that：In the Al-
The alkaline earth element Sr for being 0.06%-0.09% containing mass percent in Mg-Si-Cu-Mn-Sr alloy.Sr is surface-active member
Element can change the behavior of intermetallic phase in crystallography, be enriched on phase interface in crystal growth, hinder crystal to grow up, again
Biggish constitutional supercooling can be formed, crystal branch is made to form thin necking down and be easy to fuse, promotes the free and nucleus of crystal
Increase.Sr is added in Al-Mg-Si-Cu alloy, Sr can be enriched in the surface of silicon, reduce the coarsening rate of silicon, make the group of alloy
Refinement is knitted, to obtain the Al-Mg-Si-Cu-Mn-Sr alloy of function admirable.
Specifically, in the Al-Mg-Si-Cu-Mn-Sr alloy, the proportion of each alloying element by weight percent is：
Microalloying is to improve the aluminium alloy capability means one of mostly important with novel aluminum alloy is developed.Wherein, in Al-
In Mg-Si-Cu-Mn-Sr alloy material, less than 1.73, alloy is precipitated in matrix Mg and Si mass fraction ratio after solid solution aging
Disperse Mg2Si hardening constituent, in the present invention, the excess silicon of volume, supplement when main function is artificial aging are strengthened, and are conducive to
Precipitation strength enhances tensile strength, meanwhile, the addition of Si can eliminate Fe to the adverse effect of aluminium alloy capability.Add in alloy
Enter 0.6%~0.9% Cu, it is therefore an objective to improve plasticity of the alloy in hot-working, improve the ductility and the strength of materials of alloy.
0.5~0.6% Mn is added in alloy, it is therefore an objective to improve recrystallization temperature, refine recrystal grain, improve the intensity of alloy.
The alkaline earth element Sr that addition mass fraction is 0.06%~0.09% in alloy simultaneously, it is therefore an objective to promote rounded grain in as-cast structure
Al (MnCrFe) Si phase of shape is precipitated, and refines Si phase.The transformation of this crystallization phase morphology improves the mechanical property of alloy
And corrosive nature, the plasticity and corrosion resistance of alloy are significantly improved.
The preparation method of Al-Mg-Si-Cu-Mn-Sr alloy of the present invention, includes the following steps：
Step 1：Prepare alloy cast ingot
1a, ingredient：According to the mass percent of Al, Mg, Si, Cu, Mn, Cr, Ti, Sr, weigh among metal Al, Al-Mg
Alloy, Al-Si intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, Al-Cr intermediate alloy, Al-Ti intermediate alloy with
And Al-Sr intermediate alloy, as raw material；
1b, fusing：Setting furnace temperature is 300 DEG C first, metal Al is added in crucible after crucible is dry, kindling temperature is extremely
800 DEG C, constant temperature to Al melts, and is then cooled to 780 DEG C, stirs and keep the temperature 5~10min；
1c, Al-Si intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, Al-Ti intermediate alloy and Al- is added
Cr intermediate alloy, after to be melted, gentle agitation simultaneously continues 5~10min of heat preservation, obtains melt；
1d, refining：It adjusts furnace temperature to 750 DEG C, refining agent is added in melt, refining agent is immersed in melt to no gas
It emerges, skims after standing 5~10min of heat preservation；
1e, Al-Sr intermediate alloy is added, after to be melted, gentle agitation simultaneously continues 5~10min of heat preservation；
1f, Al-Mg intermediate alloy is added, is steadily pressed into melt bottom and is covered with coverture, to its fusing
Gentle agitation and 5~10min of heat preservation afterwards, then skim；
1g, refining agent is added again in melt, skims after standing 5~10min of heat preservation；Then 710 DEG C are cooled to, is stood
Heat preservation, is poured using water cooled copper mould, obtains alloy cast ingot；
Step 2：After successively carrying out Homogenization Treatments, rolling deformation, heat treatment to the alloy cast ingot, i.e., described in acquisition
Al-Mg-Si-Cu-Mn-Sr alloy.
Further, the Homogenization Treatments are that step 1 gained alloy cast ingot is heated to 540 DEG C and keeps the temperature 8h, then
It is air-cooled to room temperature, scale removal simultaneously mills face.
Further, the rolling deformation is first to protect the 7mm thickness alloy cast ingot after Homogenization Treatments under the conditions of 480 DEG C
Then warm 1h carries out multistage hot deformation, obtain the plate of 4.2mm thickness, and hot rolling total deformation is 40%；It anneals again；Finally
Multi-pass cold rolling is carried out again, and cold rolling total deformation is 52%, obtains the sheet alloy of 2mm thickness.Further, the annealing
Condition is：1h is kept the temperature under the conditions of 430 DEG C, is then cooled to room temperature.
Further, the heat treatment be will after rolling deformation sheet alloy obtained successively carry out solution treatment and
Artificial aging processing.Further：The solution treatment is that sheet alloy is heated to 540 DEG C, keeps the temperature 1h, and then water quenching is extremely
Room temperature, obtains solid solution state sheet alloy, and quenching shift time is not higher than 30 DEG C no more than 25s, water temperature；The artificial aging processing
It is that will be dissolved state sheet alloy to keep the temperature 8h in 180 DEG C to get the target product Al-Mg-Si-Cu-Mn-Sr sheet alloy of T6 state.
Further, refining agent described in step 1d and step 1g is C2Cl6, the additional amount of the refining agent is that ingredient is total
The 3%~5% of quality.
Compared with the prior art, the beneficial effects of the present invention are embodied in：
1, the present invention rationally designs other constituent contents by Sr microalloying, and using reasonable smelting technology and fastly
Fast solidification technology prepares the uniform tiny Al-Mg-Si-Cu-Mn-Sr alloy material of microscopic structure, and resulting materials are with good
Good corrosion resistance and room-temperature mechanical property；
2, the defects of present invention is by reasonable rolling mill practice, effectively eliminates inside ingot stomata and shrinkage porosite, it is microcosmic on make
Particle size distribution more evenly, macroscopically improves the comprehensive performance of alloy；
3, alloy preparation process of the present invention and heat treatment mode are simple, and production cost is not high, is easy to realize industrial production.
Detailed description of the invention
Fig. 1 is the as-cast metallographic structure of alloy cast ingot obtained by each embodiment, wherein：Fig. 1 (a) is Al-Mg-Si-Cu alloy
Ingot structure, Fig. 1 (b) are Al-Mg-Si-Cu-0.03Sr alloy cast ingot tissue, and Fig. 1 (c) is Al-Mg-Si-Cu-0.06Sr conjunction
Golden ingot structure, Fig. 1 (d) are Al-Mg-Si-Cu-0.09Sr alloy cast ingot tissue.
Fig. 2 is tensile strength, yield strength and the elongation change curve of sheet alloy obtained by each embodiment.
Fig. 3 is the intercrystalline corrosion pattern of sheet alloy obtained by each embodiment, wherein：Fig. 3 (a) is Al-Mg-Si-Cu alloy
Intercrystalline corrosion pattern, Fig. 3 (b) are Al-Mg-Si-Cu-0.03Sr alloy intercrystalline corrosion pattern, and Fig. 3 (c) is Al-Mg-Si-Cu-
0.06Sr alloy intercrystalline corrosion pattern, Fig. 3 (d) are Al-Mg-Si-Cu-0.09Sr alloy intercrystalline corrosion pattern.
Fig. 4 is the Peeling Corrosion pattern and intercrystalline corrosion depth capacity change curve of sheet alloy obtained by each embodiment,
In：Fig. 4 (a) is Al-Mg-Si-Cu alloy Peeling Corrosion pattern, and Fig. 4 (b) is Al-Mg-Si-Cu-0.03Sr alloy Peeling Corrosion
Pattern, Fig. 4 (c) are Al-Mg-Si-Cu-0.06Sr alloy Peeling Corrosion pattern, and Fig. 4 (d) is Al-Mg-Si-Cu-0.09Sr conjunction
Golden Peeling Corrosion pattern.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention, following embodiments are being with technical solution of the present invention
Under the premise of implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment 1
The present embodiment prepares Al-Mg-Si-Cu-Mn-0.03Sr alloy material as follows：
Step 1：Prepare alloy cast ingot
1a, ingredient：According to 95.82%Al, 1.0%Mg, 1.3%Si, 0.9%Cu, 0.6%Mn, 0.1%Ti, 0.25%
The mass percent of Cr and 0.03%Sr weighs metal Al, Al-10%Mg intermediate alloy, Al-20%Si intermediate alloy, Al-
It is closed among 50%Cu intermediate alloy, Al-20%Mn intermediate alloy, Al-10%Cr intermediate alloy, Al-5%Ti and Al-10%Sr
Gold carries out ingredient, and ingredient gross mass is 1200g；
1b, fusing：Setting furnace temperature is 300 DEG C first, metal Al is added in crucible after crucible is dry, kindling temperature is extremely
800 DEG C, constant temperature to Al melts, and is then cooled to 780 DEG C, stirs and keep the temperature 10min；
1c, Al-Si intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, Al-Ti intermediate alloy and Al- is added
Cr intermediate alloy, after to be melted, gentle agitation simultaneously continues to keep the temperature 10min, obtains melt；
1d, refining：It adjusts furnace temperature to 750 DEG C, refining agent C is added in melt2Cl6(C2Cl6Additional amount be the total matter of ingredient
The 3% of amount), refining agent is immersed in melt to no gas and is emerged, is skimmed after standing heat preservation 10min；
1e, Al-Sr intermediate alloy, after to be melted, gentle agitation is added and continues to keep the temperature 10min；
1f, Al-Mg intermediate alloy is added, is steadily pressed into melt bottom and is covered with coverture, to its fusing
It gentle agitation and skims after keeping the temperature 10min afterwards；
1g, refining agent C is added again in melt2Cl6(C2Cl6Additional amount be ingredient gross mass 3%), will refine
Agent, which is immersed in melt to no gas, emerges, and skims after standing heat preservation 10min；Then 710 DEG C are cooled to, heat preservation 10min is stood,
It is poured using water cooled copper mould, obtains alloy cast ingot；
Step 2：Homogenization Treatments
Step 1 gained alloy cast ingot is heated to 540 DEG C and keeps the temperature 8h, is then air-cooled to room temperature, scale removal simultaneously mills
Face, control final thickness are 7mm.
Step 3：Rolling deformation
7mm thickness alloy cast ingot after Homogenization Treatments is first kept the temperature into 1h under the conditions of 480 DEG C, then on two roller hot-rolling mills
Hot rolling is carried out, working modulus is followed successively by 7.14%, 9.23%, 13.56%, 17.65% per pass for hot rolling, 4 passage hot rollings are carried out altogether,
Hot rolling total deformation is 40%, and the plate of 4.2mm thickness is obtained after hot rolling；It is annealed again and (keeps the temperature 1h under the conditions of 430 DEG C, then
It is cooled to room temperature)；Finally cold rolling is carried out again, working modulus is followed successively by 9.52%, 10.53%, 14.7% per pass for cold rolling,
17.24% and 16.67%, 5 passage cold rollings are carried out altogether, and cold rolling general working rate is 52%, and the alloy sheets of 2mm thickness are obtained after cold rolling
Material；After 4 passage hot rollings and 5 passage cold rollings, operation of rolling general working rate is 71.4%.
Step 4：Heat treatment
Heat treatment is sheet alloy obtained will successively to carry out solution treatment and artificial aging processing after rolling deformation；
Solution treatment：Step 3 sheet alloy obtained is heated to 540 DEG C, keeps the temperature 1h, then water quenching (is transferred to
Cooled down in water) to room temperature, solid solution state sheet alloy is obtained, quenching shift time (shifts after completing heating from heating furnace
Time into water) it is not more than 25s, water temperature not higher than 30 DEG C；
Ageing treatment：State sheet alloy will be dissolved in 180 DEG C of heat preservation 8h to get T6 state Al-Mg-Si-Cu-Mn-0.03Sr
Sheet alloy.
For the mechanical property for testing Al-Mg-Si-Cu-Mn-0.03Sr sheet alloy, room temperature tensile is carried out to sheet alloy
Test, the specific steps are：Standard tensile specimen is made according to national standard GB6397-86 along alloy plate rolling direction, obtains alloy
Sample.The mechanical property of alloy sample obtained by test, tensile speed on the miniature control electronic universal tester of SANS-100kN
For 1mm/min；5 groups of samples of replication are averaged.Gained mechanical performance index：Tensile strength sigmabIt is strong for 394Mpa, surrender
Spend σ0.2It is 15.8% for 346.7Mpa, elongation percentage δ, see Table 1 for details.
To test Al-Mg-Si-Cu-Mn-0.03Sr alloy corrosion performance, Peeling Corrosion test is carried out to sheet alloy
And Huey test, the specific steps are：
Peeling Corrosion test is carried out according to GB/T 22639-2008 standard, and sample successively uses 400#, 600# and 800# metallographic
Sand paper polishes polishing, then carries out ultrasonic cleaning to sample with ethyl alcohol, goes deoxygenation with 10%NaOH solution corrosion at room temperature
Change film, clear water is cleaned, then uses 30%HNO3Solution neutralizes, and finally cleans drying with clear water.Treated, and sample at room temperature will
Sample experiment is put into upwardly NaCl-KNO3-HNO3It is impregnated 48 hours in corrosive liquid, solution temperature is maintained at 3 DEG C of 25 DEG C of scholars.Leaching
The complete sample of stain, the Direct Test sample in dampness observe Al-Mg-Si-Cu-Mn-0.03Sr sheet alloy Peeling Corrosion
Surface topography evaluates corrosion class.
Huey test is carried out by national standard GB/T 7998-2005.Sample successively uses 400#, 600# and 800# metallographic sand
Paper polishes polishing, then carries out ultrasonic cleaning to sample with ethyl alcohol, at room temperature with the removal oxidation of 10%NaOH solution corrosion
Film, clear water is cleaned, then uses 30%HNO3Solution neutralizes, and finally cleans drying with clear water.Treated, and sample is hung vertically in
NaCl-H2O2In corrosive liquid, impregnate 24 hours, solution temperature is maintained at 2 DEG C of 35 DEG C of soil.Drying is eluted with water in sample after corrosion.
Sample through corrosion test cuts 5mm in one end of vertical main deformation direction, grinds by metallographic preparation method of sample to sample
System polishing measures intercrystalline corrosion depth capacity by metallographic microscope.
Peeling Corrosion test gained Al-Mg-Si-Cu-Mn-0.03Sr alloy, there is blistering, slightly gos deep into sample table in surface
Face, Peeling Corrosion grade are PC grades；Al-Mg-Si-Cu-Mn-0.03Sr alloy obtained by Huey test, intercrystalline corrosion are maximum
Depth is 191.3 μm, and see Table 1 for details.
Embodiment 2
The present embodiment prepares Al-Mg-Si-Cu-Mn-0.06Sr alloy material by step same as Example 1, and difference exists
In：In step 1a according to 95.79%Al, 1.0%Mg, 1.3%Si, 0.9%Cu, 0.6%Mn, 0.1%Ti, 0.25%Cr and
The mass percent of 0.06%Sr weighs metal Al, Al-10%Mg intermediate alloy, Al-20%Si intermediate alloy, Al-50%Cu
Intermediate alloy, Al-20%Mn intermediate alloy, Al-10%Cr intermediate alloy, Al-5%Ti and Al-10%Sr intermediate alloy carry out
Ingredient, ingredient gross mass are 1200g；
Tensile test at room temperature, institute are carried out to Al-Mg-Si-Cu-Mn-0.06Sr alloy material by the identical method of embodiment 1
Obtain mechanical performance index：Tensile strength sigmabFor 399Mpa, yield strength σ0.2It is 17.7% for 349.9Mpa, elongation percentage δ, is detailed in
Table 1.
Corrosive nature test, institute are carried out to Al-Mg-Si-Cu-Mn-0.06Sr alloy material by the identical method of embodiment 1
Obtaining alloy material Peeling Corrosion grade is PC grades, and intercrystalline corrosion depth capacity is 178.3 μm, and see Table 1 for details.
Embodiment 3
The present embodiment prepares Al-Mg-Si-Cu-Mn-0.09Sr alloy material by step same as Example 1, and difference exists
In：In step 1a according to 95.76%Al, 1.0%Mg, 1.3%Si, 0.9%Cu, 0.6%Mn, 0.1%Ti, 0.25%Cr and
The mass percent of 0.09%Sr weighs metal Al, Al-10%Mg intermediate alloy, Al-20%Si intermediate alloy, Al-50%Cu
Intermediate alloy, Al-20%Mn intermediate alloy, Al-10%Cr intermediate alloy, Al-5%Ti and Al-10%Sr intermediate alloy carry out
Ingredient, ingredient gross mass are 1200g；
Tensile test at room temperature, institute are carried out to Al-Mg-Si-Cu-Mn-0.09Sr alloy material by the identical method of embodiment 1
Obtain mechanical performance index：Tensile strength sigmabFor 399Mpa, yield strength σ0.2It is 17.5% for 345.6Mpa, elongation percentage δ, is detailed in
Table 1.
Corrosive nature test, institute are carried out to Al-Mg-Si-Cu-Mn-0.09Sr alloy material by the identical method of embodiment 1
Obtaining alloy material Peeling Corrosion grade is PC grades, and intercrystalline corrosion depth capacity is 170.6 μm, and see Table 1 for details.
Comparative example
To compare influence of the addition of different content Sr element to Al-Mg-Si-Cu-Mn alloy material performance, press and implementation
The identical mode of example 1 prepares Al-Mg-Si-Cu-Mn-0Sr alloy material, and difference is only that；In step 1a according to 95.85%Al,
The mass percent of 1.0%Mg, 1.3%Si, 0.9%Cu, 0.6%Mn, 0.1%Ti, 0.25%Cr weigh metal Al, Al-
10%Mg intermediate alloy, Al-20%Si intermediate alloy, Al-50%Cu intermediate alloy, Al-20%Mn intermediate alloy, Al-10%
Cr intermediate alloy and Al-5%Ti carry out ingredient, and ingredient gross mass is 1200g；
Tensile test at room temperature, gained are carried out to Al-Mg-Si-Cu-Mn-0Sr alloy material by the identical method of embodiment 1
Mechanical performance index：Tensile strength sigmabFor 399Mpa, yield strength σ0.2It is 15.4% for 354.2Mpa, elongation percentage δ, is detailed in table
1。
Corrosive nature test, gained are carried out to Al-Mg-Si-Cu-Mn-0Sr alloy material by the identical method of embodiment 1
Alloy material Peeling Corrosion grade is EB grades, and intercrystalline corrosion depth capacity is 213 μm, and see Table 1 for details.
In embodiments after alloy cast ingot preparation (i.e. after the completion of step 1), in order to determine the alloying component of alloy cast ingot
Whether meet the requirements, composition detection is carried out to all alloy cast ingots using spectrometer, test result such as table 2 illustrates that the present invention adopts
Smelting technology can prepare the Al-Mg-Si-Cu-Mn-Sr alloy cast ingot that ingredient meets design requirement.
The alloy plate T6 state room-temperature mechanical property prepared by the present invention of table 1 and corrosive nature test result
| Specimen coding | Tensile strength/MPa | Yield strength/MPa | Elongation percentage/% | Intercrystalline corrosion depth capacity/μm | Peeling Corrosion/grade |
| Embodiment 1 | 394 | 346.7 | 15.8 | 191.3 | PC |
| Embodiment 2 | 399 | 349.9 | 17.7 | 178.3 | PC |
| Embodiment 3 | 399 | 345.6 | 17.5 | 170.6 | PC |
| Comparative example | 399 | 354.2 | 15.4 | 213 | EB |
The chemical component of 2 alloy of table
Alloy cast ingot sample (sample i.e. after the completion of step 1) is taken, in MR5000 type metallography microscope microscopic observation metallographic group
It knits, as shown in Figure 1.Fig. 1 (a), (b), (c) and (d) are respectively Al-Mg-Si-Cu-Mn-0Sr alloy, Al-Mg-Si-Cu-Mn-
The as cast condition metallographic group of 0.03Sr alloy, Al-Mg-Si-Cu-Mn-0.06Sr alloy and Al-Mg-Si-Cu-Mn-0.09Sr alloy
It knits.As seen from the figure, the form of a large amount of dendrite and the mixing of a small amount of equiax crystal, addition are showed without the alloy structure of Metamorphism treatment
After Sr element, the equiax crystal quantity of alloy increases, and dendrite is refined, but alloy structure is still that dendrite and equiax crystal mix
Form, when Sr constituent content is 0.06wt.%, the tissue thinning effect of alloy is most obvious.
The mechanical performance index for comparing the alloy material of different Sr additive amounts, by table 1 and Fig. 2 it is found that Sr is for Al-Mg-
The tensile strength of Si-Cu-Mn alloy can significantly improve the elongation percentage of alloy without influence, and being primarily due to addition Sr can
It with refining alloy as-cast structure, promotes tissue inner circle granular Al (MnCrFe) Si phase and is precipitated, and needle-shaped Si phase is presented
, there are a large amount of spherical Si phases in broken phenomenon out, and the transformation of this crystallization phase morphology improves the plasticity of alloy.
The exfoliation Corrosion for comparing the alloy material of different Sr additive amounts, by table 1 and Fig. 4 it is found that addition Sr can be shown
Writing improves Al-Mg-Si-Cu-Mn alloy Peeling Corrosion pattern, and the Peeling Corrosion grade of alloy is improved by EB to PC.
The corrosion among crystalline grains for comparing the alloy material of different Sr additive amounts, by table 1, Fig. 3 and Fig. 4 it is found that addition Sr can
Al-Mg-Si-Cu-Mn alloy intercrystalline corrosion depth is obviously reduced, wherein addition 0.06%Sr and 0.09%Sr effect is most bright
It is aobvious, the intercrystalline corrosion depth capacity of alloy can be reduced to 180 μm or less by 213 μm that are not added with Sr.
The above is only exemplary embodiment of the present invention, are not intended to limit the invention, all in spirit of the invention
With any modifications, equivalent replacements, and improvements made within principle etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of Al-Mg-Si-Cu-Mn-Sr alloy with excellent anticorrosive performance, it is characterised in that：In the Al-Mg-
The alkaline-earth metal Sr for being 0.06%-0.09% containing mass percent in Si-Cu-Mn-Sr alloy.
2. Al-Mg-Si-Cu-Mn-Sr alloy according to claim 1, it is characterised in that：The Al-Mg-Si-Cu-Mn-
In Sr alloy, the proportion of each alloying element by weight percent is：
3. a kind of preparation method of Al-Mg-Si-Cu-Mn-Sr alloy of any of claims 1 or 2, which is characterized in that including with
Lower step：
Step 1：Prepare alloy cast ingot
1a, ingredient：According to the mass percent of Al, Mg, Si, Cu, Mn, Cr, Ti, Sr, weigh metal Al, Al-Mg intermediate alloy,
Al-Si intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, Al-Cr intermediate alloy, Al-Ti intermediate alloy and Al-
Sr intermediate alloy, as raw material；
1b, fusing：Setting furnace temperature is 300 DEG C first, and metal Al is added in crucible after crucible is dry, kindling temperature to 800 DEG C,
Constant temperature is melted to Al, is then cooled to 780 DEG C, is stirred and keep the temperature 5~10min；
1c, it is added in Al-Si intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, Al-Ti intermediate alloy and Al-Cr
Between alloy, after to be melted, stir and continue 5~10min of heat preservation, obtain melt；
1d, refining：It adjusts furnace temperature to 750 DEG C, refining agent is added in melt, refining agent is immersed in melt to no gas and is emitted
Out, it skims after standing 5~10min of heat preservation；
1e, Al-Sr intermediate alloy is added, after to be melted, stir and continue 5~10min of heat preservation；
1f, Al-Mg intermediate alloy is added, is steadily pressed into melt bottom and is covered with coverture, stirred after its fusing
5~10min is mixed and kept the temperature, is then skimmed；
1g, refining agent is added again in melt, skims after standing 5~10min of heat preservation；Then 710 DEG C are cooled to, is stood again
It after keeping the temperature 5~10min, is poured using water cooled copper mould, obtains alloy cast ingot；
Step 2：After successively carrying out Homogenization Treatments, rolling deformation, heat treatment to the alloy cast ingot, that is, obtain the Al-Mg-
Si-Cu-Mn-Sr alloy.
4. preparation method according to claim 3, it is characterised in that：The Homogenization Treatments are by step 1 gained alloy
Ingot casting is heated to 540 DEG C and keeps the temperature 8h, is then air-cooled to room temperature, and scale removal simultaneously mills face.
5. preparation method according to claim 3, it is characterised in that：The rolling deformation is will be after Homogenization Treatments
7mm thickness alloy cast ingot first keeps the temperature 1h under the conditions of 480 DEG C, then carries out multistage hot deformation, obtains the plate of 4.2mm thickness, hot rolling
Total deformation is 40%；It anneals again；Multi-pass cold rolling is finally carried out again, and cold rolling total deformation is 52%, obtains 2mm thickness
Sheet alloy；
The condition of the annealing is：1h is kept the temperature under the conditions of 430 DEG C, is then cooled to room temperature.
6. preparation method according to claim 3, it is characterised in that：The heat treatment is will to be obtained after rolling deformation
Sheet alloy successively carry out solution treatment and artificial aging processing；
The solution treatment is that sheet alloy is heated to 540 DEG C, keeps the temperature 1h, and then water quenching to room temperature obtains solid solution state alloy
Plate, quenching shift time are not higher than 30 DEG C no more than 25s, water temperature；
The artificial aging processing is will to be dissolved state sheet alloy to keep the temperature 8h in 180 DEG C to get the target product Al-Mg- of T6 state
Si-Cu-Mn-Sr sheet alloy.
7. preparation method according to claim 3, it is characterised in that：Step 1d is with refining agent described in step 1g
C2Cl6, the additional amount of the refining agent is the 3%~5% of ingredient gross mass.
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