CN106827712A - Heat exchanger brazed aluminum alloy composite board, core material and preparation method - Google Patents
Heat exchanger brazed aluminum alloy composite board, core material and preparation method Download PDFInfo
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- CN106827712A CN106827712A CN201710028346.6A CN201710028346A CN106827712A CN 106827712 A CN106827712 A CN 106827712A CN 201710028346 A CN201710028346 A CN 201710028346A CN 106827712 A CN106827712 A CN 106827712A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- 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
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- 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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- 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
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Abstract
The present invention relates to a kind of heat exchanger brazed aluminum alloy composite board, core material and preparation method.The core material is aluminium alloy, its Si for containing 0.6 0.9% mass, the Fe of 0.2 0.5% mass, the Cu of 0.4 0.8% mass, the Mn of 1.3 1.6% mass, the Ti of 0.05 0.15% mass, the Zr of 0 0.15% mass, remaining is Al and the inevitable impurity less than 0.15% mass.The composite board includes skin material, the core material and anticorrosive coat, and the side of the core material is compounded with skin material, and it is 4 line aluminium alloys；The opposite side of the core material is compounded with anticorrosive coat, and it is AA7072 aluminium alloys.Heat exchanger of the invention brazed aluminum alloy composite board, core material and preparation method, while keeping or improving Al alloy composite processing forming, further increase the pricker deposited strength and corrosion resistance of composite board.
Description
Technical field
The invention mainly relates to a kind of aluminium alloy plate, more particularly to a kind of heat exchanger brazed aluminum alloy composite board,
Core material and preparation method.
Background technology
Aluminium alloy has rich reserves, high-strength matter ratio, a good corrosion resistance, the superiority such as heat transfer coefficient is high and easy to process
Can, it is widely used in heat exchanger field as transfer material.3 ××× line aluminium alloys have preferably due to the addition of Mn
Elevated temperature strength so that soldering work piece is unlikely to deform under the high temperature conditions, and yield strength is general in 40-55MPa after its soldering, often
Used with brazed aluminum alloy frequently as heat exchanger, most typical representative is AA3003 aluminium alloys.Heat exchanger towards miniaturization,
The directions such as lightweight, high-performance, low cost, long-life are developed, and developing lighter and thinner aluminum heat exchanger becomes important grinding
Study carefully direction.Because weight saving and thickness are thinning, this requires brazed aluminum alloy composite in same load or stress condition
Down have intensity and decay resistance higher, with prevent its deform during follow-up brazing process or use even ftracture or
Person's corrosion failure.Therefore exploitation deposited strength is higher, corrosion resistance is good can brazed aluminum alloy composite turned into current hot
Exchanger manufactures the developing direction in field.
The equipment engine power such as large-scale engineering machinery, heavy truck is big, it is desirable to its cooling water tank mainboard and side plate except
Outside with good punching performance, heat dispersion and corrosion resisting property, should also have intensity higher to support the water tank to make it not send out
The shape that changes or cracking and cause the unfavorable condition that heat exchanger reveals.Existing AA3 ×××s/AA4 ×××s composite board band is
Powerful device heat exchanger can not be met to intensity and corrosion proof requirement.By the research and development of decades, AA3003
The highly developed stabilization of production technology, be difficult to further improve the performance of alloy by the improvement of technique.Alloying turn into carry
The effective way of high alloy deposited strength and corrosion resisting property.
In general, in brazed aluminum alloy composite manufacturing process, in founding cutting head cutting tail, milling face, hot rolling and cold
Roll cutting head cutting tail, finishing cutting operation in can produce about 30% leftover pieces.Contain alloying element higher in these leftover pieces,
How Efficient Cycle is significant for reducing product cost and reduction energy resource consumption using these leftover pieces.
In sum, from the point of view of above-mentioned prior art, heat exchanger brazed aluminum alloy composite board is primarily present following
Problem：First, not enough, intensity and corrosion resisting property can not be taken into account existing aluminum alloy composite board combination property simultaneously.Due to weight
Mitigate and thickness is thinning, this requires that brazed aluminum alloy composite has intensity higher under same load or stress condition
And decay resistance, and the intensity of existing radiator of water tank Al alloy composite can not meet high-power engineering machinery, weight
The requirement of type truck etc..
Further, the cost of material of existing aluminum alloy composite board is higher.In existing Composite board products, in order to meet plate
Deep drawability energy, the microscopic structure for example thick second for core mutually strictly controlled, and control method is exactly as far as possible
Reduction forms impurity element such as Fe, Si constituent content of thick compound phase, such as by the control of Fe contents below 0.15%, Si controls
System is below 0.1%.The reduction of Fe, Si content means that the raw material of material needs the raw material of higher purity, and in the market
Commercial-purity aluminium Fe contents are less than 0.25% less than 0.35%, Si contents, and this has been considerably improved the cost of material of product.
Therefore, in order to while keeping or improving Al alloy composite processing forming, further increase compound
The pricker deposited strength and corrosion resistance of sheet material, and further improve prior art to production cost high caused by raw material high request, have
Wait to propose a kind of new production heat exchanger brazed aluminum alloy composite board and its technology of preparing.
The content of the invention
Regarding to the issue above, the present invention is intended to provide a kind of heat exchanger brazed aluminum alloy composite board, core material
And preparation method, while keeping or improving Al alloy composite processing forming, further increase composite board
Pricker deposited strength and corrosion resistance.
The invention provides a kind of heat exchanger core material of brazed aluminum alloy composite board, the core material is
Aluminium alloy, the Fe, the Cu of 0.4-0.8% mass, 1.3-1.6% of its Si for containing 0.6-0.9% mass, 0.2-0.5% mass
The Ti of the Mn of quality, 0.05-0.15% mass, the Zr of 0-0.15% mass, remaining be Al and less than 0.15% mass can not
Avoid impurity.
The present invention also provides a kind of brazed aluminum alloy composite board of the heat exchanger comprising above-mentioned core material, described multiple
Plywood material includes skin material, the core material and anticorrosive coat, and the side of the core material is compounded with skin material, and it 4 is that aluminium is closed that it is
Gold；The opposite side of the core material is compounded with anticorrosive coat, and it is AA7072 aluminium alloys.
Above-mentioned composite board, the composite board can further be compounded with described 4 and be positioned at the outside of the anticorrosive coat
Aluminium alloy skin material.
Above-mentioned composite board, the ratio that every layer of skin material, the thickness of anticorrosive coat account for the composite board gross thickness is equal
It is 8-12%.
Above-mentioned composite board, the thickness of the composite board is 1.0-2.5mm.
Above-mentioned composite board, 10-40 μm of thickness is formed with compound interface of the skin material with the core material
High density Precipitation band.
Above-mentioned composite board, the composite board postwelding yield strength is not less than 55MPa.
Above-mentioned composite board, the aperture time is more than first for composite board soldering side SWAAT salt air corrosions after the soldering
28 days.
The present invention also provides a kind of method for preparing above-mentioned composite board, and methods described includes step：
The skin material, core material and anticorrosive coat ingot casting are prepared respectively；
To the core material Homogenization Treatments；
By heating rolling after the skin material and anticorrosive coat ingot mill surface into certain thickness sheet material, by skin material, core material and
The order of anticorrosive coat is stacked and method hot rolling；
Cold rolling is carried out to the composite board after the method hot rolling；
Composite board after the cold rolling is made annealing treatment.
Above-mentioned method, the raw material of the core material selects the leftover pieces and fine aluminium, pure silicon, manganese of the composite board
One or more composition allotment among agent, aluminum bronze intermediate alloy, aluminium titanium intermediate alloy, aluminium zirconium hardener is formed, described multiple
The leftover pieces of plywood material account for the 30%-45% of the raw material gross weight.
Can not be taken into account for the intensity and corrosion resistance of existing composite board and shortcoming that cost of material is higher, the present invention passes through
Optimization core alloy design, by properly increasing Cu, Mn, Fe, Si constituent content, makes these alloying elements or is being solid-solution in aluminium base
In body, or formed and refine the second of Dispersed precipitate and mutually strengthen core matrix, prepared heat exchanger aluminium alloy compound
Sheet material, while keeping or improving Al alloy composite processing forming, after further increasing the soldering of composite
Intensity and corrosion resistance, and reduce further the cost of material of composite.
Brief description of the drawings
Fig. 1 is the structural representation of the three-decker aluminum alloy composite board of the embodiment of the present invention；
Fig. 2 is the structural representation of the four-layer structure aluminum alloy composite board of the embodiment of the present invention；
Fig. 3 be the embodiment of the present invention three-layer composite board material soldering after there is the metallographic structure knot of high density Precipitation band
Structure schematic diagram.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the invention is described in more details, so as to energy
Enough more fully understand the advantage of the solution of the present invention and various aspects.However, specific embodiments described below and implementation
Example is only descriptive purpose, rather than limitation of the present invention.
The present invention discloses a kind of Al alloy composite, and the composite board is made up of three layers or four layers of aluminium alloy, wherein three
Rotating fields be AA4 ×××s/AA3003Mod/AA7072, four-layer structure be AA4 ×××s/AA3003Mod/AA7072/AA4 ×
××, concrete structure schematic diagram visible Fig. 1 and Fig. 2.Wherein AA4 ×××s represent 4 line aluminium alloys；AA3003Mod represents modified
AA3003 aluminium alloys.
The aluminium alloy of the skin material is AA4 ××× line aluminium alloys, its Si for containing 7.0-10.5% mass, and remaining is
Al and the inevitable impurity less than 0.5%.
The aluminium alloy of the anticorrosive coat is AA7072 alloys, the Zn containing 0.8-1.3% mass, and remaining is Al and to be less than
0.5% inevitable impurity.
The aluminium alloy of the core material is modified AA3003 alloys, the Si containing 0.6-0.9% mass, 0.2-
The Cu of the Fe of 0.5% mass, 0.4-0.8% mass, the Mn of 1.3-1.6% mass, the Ti of 0.05-0.15% mass, 0-
The Zr of 0.15% mass, remaining is Al and the inevitable impurity less than 0.15% mass.
The ratio that every layer of skin material, anticorrosive coat thickness account for composite board gross thickness is 8-12%, remaining as sandwich layer material
Material.
The present invention is described as follows to the main adding elements of core material aluminium alloy：
1st, Mn (1.3-1.6%)
Mn is unique main alloying element in AA3 ×××s system alloy, generally generates Al with solution or with Al6Mn phases
It is present in alloy.The presence of Mn can reduce the diffusion coefficient of other solute atoms and the decomposition rate of solid solution, therefore be to carry
The essential element of high-aluminium alloy heat resistance and intensity.When Mn contents are higher than 1.6%, the thick phases of AlFeMn, drop are easily formed with Fe
Low-alloy processing characteristics；When Mn contents are less than 1.3%, strengthen not sufficiently effective.Mn contents are in the range of 1.3-1.6%, and alloy is strong
The combination properties such as degree, plasticity and technique processability are good.Therefore preferred scope is 1.3-1.6%.
2nd, Cu (0.4-0.8%)
Cu can significantly improve alloy strength in being added to aluminium in the form of solution strengthening, while significantly improving the corruption of alloy
Erosion current potential, that is, the corrosion potential increased between the fin of follow-up soldering and plate core material is poor, fin is provided negative electrode for core
Protection.When Cu contents are higher than 0.8%, the corrosion among crystalline grains of alloy deteriorate；When Cu contents are less than 0.4%, reinforcing effect is not
Foot.Cu contents are in the range of 0.4-0.8%, and alloy strength and decay resistance are good.Therefore preferred scope is 0.4-0.8%.
3rd, Si (0.6-0.9%)
Si can form the T-phase (Al of complexity with Mn12Mn3Si2), while Si can also promote supersaturated solid solution to decompose, shape
Into highdensity disperse fine particle, so that improve alloy strength.The content of Si is less than 0.6%, to the beneficial effect of alloy not
Foot；When Si contents are higher than 0.9%, the fusing point reduction of core alloy increases the risk of alloy melting in brazing process.Preferred scope
It is 0.6%-0.9%.
4th, Fe (0.2-0.5%)
Fe can be dissolved in Al6Mn and form Al6(Fe, Mn) compound, so as to reduce solubility of the Mn in Al；Meanwhile, Fe
Also submicron order Al-Mn-Fe-Si phases are easily formed, core alloy intensity and recrystallization temperature can be effectively improved.When Fe+Mn contains
When amount is less than 1.85%, effectively reinforced alloys and the grain structure of sheet material can be refined；When Fe+Mn is higher than 1.85%, then can
Thick Al-Fe-Mn-Si primary phases are formed, deteriorates processing characteristics.Preferred scope is 0.2-0.5%.
5th, Ti (0.05-0.15%)
Ti can refined cast structure, ingot casting ftractures when preventing casting, improves the recrystallization temperature of alloy, reduces supersaturation solid
The decomposition tendency of solution.When Ti contents are higher than 0.15%, thick compound Al can be formed in ingot casting3Ti, reduction is prevented out
The action effect such as split；When Ti contents are less than 0.05%, prevent the action effects such as cracking unobvious.
6th, Zr (0-0.15%)
Zr is mainly Al3The form of Zr is deposited in the alloy, can notable crystal grain thinning, improve alloy recrystallization temperature and
The stability of solid solution, so as to improve the heat resistance of alloy.When content is higher than 0.15%, more frangible compounds, drop are generated
The processing characteristics of low material, therefore preferably 0-0.15%.
Heat exchanger of the present invention brazed aluminum alloy composite board, its preparation process includes alloy casting, uniform
Change treatment, compound, hot rolling, cold rolling, annealing, prepared sheet metal thickness is between 1.0-2.5mm scopes.
The method for preparing above-mentioned composite board, specifically includes following steps：
The skin material, core material and anticorrosive coat ingot casting are prepared respectively；
To the core material Homogenization Treatments；
By heating rolling after the skin material and anticorrosive coat ingot mill surface into certain thickness sheet material, by skin material, core material and
The order of anticorrosive coat is stacked and method hot rolling；
Cold rolling is carried out to the composite board after the method hot rolling；
Composite board after the cold rolling is made annealing treatment.
The raw material of the core material can select the leftover pieces of the composite board and pure raw material allotment is formed, described compound
The leftover pieces of sheet material account for the 30%-45% of the raw material gross weight.Wherein pure raw material may be selected from fine aluminium, pure silicon, manganese agent, in the middle of aluminum bronze
One or more composition among alloy, aluminium titanium intermediate alloy, aluminium zirconium hardener etc..
Proved by lot of experiments, composite board postwelding yield strength of the present invention is not less than 55MPa；After the soldering
The aperture time is more than 28 days first for composite board soldering side SWAAT salt air corrosion.
Compared with prior art, the present invention has the advantages that protrusion.
Traditionally Fe, Si are the impurity elements as AA3 ××× line aluminium alloys, and thick Al is formed in the alloy
(Fe, Mn) Si phases are present, and the mechanical property, processing characteristics to material produce larger harm.According to designed by patent of the present invention
Composite board prepared by the core of Cu high, Si high and medium Fe contents, detects that it has intensity high, excellent through lot of experiments
Processing characteristics and decay resistance, high comprehensive performance disclosure satisfy that high-power engineering machinery, heavy truck etc. to cooling water tank
The requirement of mainboard and side plate.Its advantage is specific as follows：
(1) excellent decay resistance
The addition of high level Cu, substantially increases the corrosion potential of core material alloy, makes it with follow-up brazing fin
Corrosion potential gap increase.Because fin material has lower corrosion potential, so that fin can be as the preferential quilt of anode
Corrode so as to protect as the sheet material core of negative electrode, this provides for improved heat exchanger external corrosion performance.
Meanwhile, in composite board brazing process, the high density precipitation analysis of 10-40 μm of thickness can be formed at compound interface
Go out band (BDP), as shown in Figure 3.Because the corrosion potential of the second phase of a large amount of Dispersed precipitates in core material is high compared with skin material, work as skin
When material expands to high density Precipitation band by intercrystalline corrosion, will be formed with remaining skin material as negative electrode, high density sealed Belt
It is the galvanic cell of anode, slows down corrosion and continue toward core extension, so as to improve the decay resistance of composite board.Additionally, compound
The tactile water side of material is equally also served as anode and is protected as negative electrode using the lower AA7072 corrosive protection of aluminium alloy layer of corrosion potential
AA3003Mod alloys.The AA7072 alloys of fin, high density Precipitation band and tactile water side with composite board soldering are triple
Protective effect, substantially prolongs the service life of heat exchanger.
(2) intensity and deep drawability high
This patent is ensureing the relatively low corrosion potential of fin material alloy, on the premise of providing cathodic protection for core, adopts
With Cu high, Si high, medium Fe contents Alloying Design composite core, its alloy hot-working, heat treatment and soldering
Cheng Zhong, or solution strengthening effect is produced with solid solution containing Cu, or generate and refine the phases of AlFeMnSi second of Dispersed precipitate and brilliant
Grain is organized and produces invigoration effect, improves the intensity of composite so that it is (conventional multiple that its postwelding yield strength is not less than 55MPa
Plywood postwelding yield strength requirement >=45MPa).
(3) cheap material cost
The characteristics of core of composite board has Si high, medium Fe contents in the present invention, its content is higher than commercial-purity aluminium (Si
0.35%) content is less than less than 0.25%, Fe contents, therefore can add the composite board leftover pieces of 30%-45%, waste material
Allotment alloying component, promotes recycling for each operation processing clout, this reduces the cost of material about 10%- of alloy
20%, so as to reduce the totle drilling cost of product.
In a word, the present invention is designed by optimizing core alloy, by properly increasing Cu, Mn, Fe, Si constituent content, makes this
A little alloying elements are solid-solution in aluminum substrate, or are formed and refined the second of Dispersed precipitate and mutually strengthen core matrix, preparation
Heat exchanger aluminum alloy composite board, while keeping or improving Al alloy composite processing forming, further carries
The pricker deposited strength and corrosion resistance of composite high, and reduce further the cost of material of composite.
Embodiment 1
The present embodiment is a kind of three layers of heat exchanger brazed aluminum alloy composite board, and its structure is as shown in Figure 1.Wherein 1
It is AA4045 alloys, 2 is middle core AA3003Mod alloys, and 3 is AA7072 alloys.AA3003Mod alloys contain 0.6%
Si, 0.3% Fe, 0.4% Cu, 1.3% Mn, 0.05% Ti, remaining is Al and inevitable miscellaneous less than 0.15%
Matter.
The present embodiment is carried out according to the following steps：
1) alloy casting：Respectively according to respective composition molten alloy, using semi-continuous casting method, prepare respectively
AA4045, AA3003Mod and AA7072 ingot casting, cast ingot dimension are 400 × 1120 × 4800mm.
2) Homogenization Treatments：AA3003Mod ingot castings are incubated 12 ± 1h at 610 ± 10 DEG C and carry out Homogenization Treatments.
3) it is combined：AA4045, AA7072 after surface treated are hot-rolled down to 47 ± 0.5mm, then divide equally and are broken into 4800mm
Thickness is about the AA3003Mod alloys of 380mm according to the order of AA4045, AA3003Mod, AA7072 after one section of length, with milling face
Stack from top to bottom and tie up.
4) hot rolling：The slab that will be tied up is heated to 500 ± 10 DEG C and is incubated 12 ± 1h, then through multistage hot deformation to 5
± 0.5mm, finishing temperature is more than 300 DEG C, then clot air cooling.
5) it is cold rolling：Through multi-pass cold rolling to 1.00 ± 0.01mm.
6) anneal：Composite cold rolling coil is incubated 4 ± 0.5h in 380 DEG C of ± 10 DEG C of annealing furnaces, and air cooling is to obtain this hair
The bright brazed aluminum alloy composite board.
Aluminum alloy composite board prepared by the present embodiment is simulated soldering, and simulation soldering processes are warming up to for 24min
600 DEG C, 10min is incubated, protective atmosphere is argon gas.Testing result display soldering connection works well, and the performance before and after soldering is such as
Shown in table 1.Composite board yield strength is in a slight decrease before relatively welding after soldering, is 56.3MPa, and elongation percentage is 21.7%；Soldering side
The aperture time is more than 28 days first for SWAAT salt air corrosions, and common 4 ×××/3 ××× system brazing sheet yield strength is only
It is 40-55MPa, the aperture time is about 10 days first for 1.00mm composite board solderings side SWAAT salt air corrosion.Thus the present embodiment
Under conditions of Sheet Metal Forming Technology requirement is met, intensity is significantly improved prepared composite board with corrosion resistance.
Al alloy composite plate property prepared by the embodiment 1 of table 1
Embodiment 2
The present embodiment is a kind of three layers of heat exchanger brazed aluminum alloy composite board, and its structure is as shown in Figure 1.Wherein 1
It is AA4045 alloys, 2 is middle core AA3003Mod alloys, and 3 is AA7072 alloys.AA3003Mod alloys contain 0.6%
Si, 0.5% Fe, 0.5% Cu, 1.4% Mn, 0.1% Ti, remaining is Al and inevitable miscellaneous less than 0.15%
Matter.
The present embodiment is carried out according to the following steps：
1) alloy casting：Respectively according to respective composition molten alloy, using semi-continuous casting method, prepare respectively
AA4045, AA3003Mod and AA7072 ingot casting, cast ingot dimension are 450 × 1120 × 4800mm.
2) Homogenization Treatments：AA3003Mod ingot castings are incubated 12h at 600 ± 10 DEG C and carry out Homogenization Treatments.
3) it is combined：AA4045, AA7072 after surface treated are hot-rolled down to 55 ± 0.5mm, then divide equally and are broken into 4800mm
Thickness is about the AA3003Mod alloys of 430mm according to the order of AA4045, AA3003Mod, AA7072 after one section of length, with milling face
Stack from top to bottom and tie up.
4) hot rolling：The slab that will be tied up is heated to 490 ± 10 DEG C and is incubated 12 ± 1h, then through multistage hot deformation to 5
± 0.5mm, finishing temperature is more than 300 DEG C, then clot air cooling.
5) it is cold rolling：Through multi-pass cold rolling to 1.20 ± 0.01mm.
6) anneal：Composite cold rolling coil is incubated 4 ± 0.5h in 390 DEG C of ± 10 DEG C of annealing furnaces, and air cooling is to obtain this hair
The bright brazed aluminum alloy composite board.
Aluminum alloy composite board prepared by the present embodiment is simulated soldering, and simulation soldering processes are warming up to for 24min
600 DEG C, 10min is incubated, protective atmosphere is argon gas.Testing result display soldering connection works well, and the performance before and after soldering is such as
Shown in table 2.The yield strength of composite board is 63.5MPa after soldering, and elongation percentage is 19.7%, the SWAAT salt air corrosions of soldering side
The aperture time is more than 42 days first, and 4 common ×××/3 ××× system brazing sheet yield strengths are only 40-55MPa,
The aperture time is about 12 days first for 1.20mm composite board solderings side SWAAT salt air corrosion.Thus answering prepared by the present embodiment
Under conditions of Sheet Metal Forming Technology requirement is met, intensity is significantly improved plywood material with corrosion resistance.
Aluminum alloy composite board performance prepared by the embodiment 2 of table 2
Embodiment 3
The present embodiment is a kind of four layers of heat exchanger brazed aluminum alloy composite board, and its structure is as shown in Figure 2.Wherein 1
It is AA4343 alloys, 2 is middle core AA3003Mod alloys, and 3 is AA7072 alloys.AA3003Mod alloys contain 0.72%
Si, 0.2% Fe, 0.71% Cu, 1.60% Mn, 0.05% Ti, 0.15% Zr, remaining is Al and less than 0.15%
Inevitable impurity.
The present embodiment is carried out according to the following steps：
1) alloy casting：Respectively according to respective composition molten alloy, using semi-continuous casting method, prepare respectively
AA4343, AA3003Mod and AA7072 ingot casting, cast ingot dimension are 450 × 1290 × 5100mm.
2) Homogenization Treatments：AA3003Mod ingot castings are incubated 18h at 600 ± 10 DEG C and carry out Homogenization Treatments.
3) it is combined：AA4343, AA7072 after surface treated are hot-rolled down to 60 ± 0.5mm, then divide equally and are broken into 5100mm
Thickness is about the AA3003Mod alloys of 430mm according to AA4343, AA3003Mod, AA7072, AA4343 after one section of length, with milling face
Order stack from top to bottom and tie up.
4) hot rolling：The slab that will be tied up is heated to 500 ± 10 DEG C and is incubated 14 ± 1h, then through multistage hot deformation to 8
± 0.5mm, finishing temperature is more than 300 DEG C, then clot air cooling.
5) it is cold rolling：Through multi-pass cold rolling to 2.50 ± 0.01mm.
6) anneal：Composite cold rolling coil is incubated 6 ± 0.5h in 410 DEG C of ± 10 DEG C of annealing furnaces, and air cooling is to obtain this hair
The bright brazed aluminum alloy composite board.
Aluminum alloy composite board prepared by the present embodiment is simulated soldering, and simulation soldering processes are warming up to for 24min
600 DEG C, 10min is incubated, protective atmosphere is argon gas.Testing result display soldering connection works well, and the performance before and after soldering is such as
Shown in table 3.The yield strength of composite board is 58.2MPa after soldering, and elongation percentage is 21.9%, the SWAAT salt air corrosions of soldering side
The aperture time is more than 63 days first, and 4 common ×××/3 ××× system brazing sheet yield strengths are only 40-55MPa,
The aperture time is about 21 days first for 2.50mm composite board solderings side SWAAT salt air corrosion.Thus answering prepared by the present embodiment
Under conditions of Sheet Metal Forming Technology requirement is met, intensity is significantly improved plywood material with corrosion resistance.
Aluminum alloy composite board performance prepared by the embodiment 3 of table 3
Embodiment 4
The present embodiment is a kind of four layers of heat exchanger brazed aluminum alloy composite board, and its structure is as shown in Figure 2.Wherein 1
It is AA4045 alloys, 2 is middle core AA3003Mod alloys, and 3 is AA7072 alloys.AA3003Mod alloys contain 0.9%
Si, 0.31% Fe, 0.8% Cu, 1.56% Mn, 0.15% Ti, 0.05% Zr, remaining is Al and less than 0.15%
Inevitable impurity.
The present embodiment is carried out according to the following steps：
1) alloy casting：Respectively according to respective composition molten alloy, using semi-continuous casting method, prepare respectively
AA4045, AA3003Mod and AA7072 ingot casting, cast ingot dimension are 450 × 1450 × 5100mm.
2) Homogenization Treatments：AA3003Mod ingot castings are incubated 14 ± 1h at 600 ± 10 DEG C and carry out Homogenization Treatments.
3) it is combined：AA4045, AA7072 after surface treated are hot-rolled down to 60 ± 0.5mm, then divide equally and are broken into 5100mm
Thickness is about the AA3003Mod alloys of 430mm according to AA4045, AA3003Mod, AA7072AA4045 after one section of length, with milling face
Order stack from top to bottom and tie up.
4) hot rolling：The slab that will be tied up is heated to 480 ± 10 DEG C and is incubated 16 ± 1h, then through multistage hot deformation to 6
± 0.5mm, finishing temperature is more than 300 DEG C, then clot air cooling.
5) it is cold rolling：Through multi-pass cold rolling to 1.50 ± 0.01mm.
6) anneal：Composite cold rolling coil is incubated 4 ± 0.5h in 400 DEG C of ± 10 DEG C of annealing furnaces, and air cooling is to obtain this hair
The bright brazed aluminum alloy composite board.
Aluminum alloy composite board prepared by the present embodiment is simulated soldering, and simulation soldering processes are：24min is warming up to
600 DEG C, 10min is incubated, protective atmosphere is argon gas.Testing result display soldering connection works well, and the performance before and after soldering is such as
Shown in table 4.Composite board has good deep drawability energy after soldering, and because the elements such as Cu, Si increase, yield strength is reachable
64.7MPa, elongation percentage is 20.7%, and the aperture time is more than 70 days first for soldering side SWAAT salt air corrosion, and 4 common ××s
The ××× system of ×/3 brazing sheet yield strength is only 40-55MPa, and the SWAAT salt air corrosions of 1.50mm composite board solderings side are first
The secondary aperture time is about 14 days.Thus the composite board prepared by the present embodiment is under conditions of Sheet Metal Forming Technology requirement is met, by force
Degree is significantly improved with corrosion resistance.
Aluminum alloy composite board performance prepared by the embodiment 4 of table 4
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to implementation method.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (10)
1. a kind of heat exchanger core material of brazed aluminum alloy composite board, the core material is aluminium alloy, and it contains
The Fe of the Si of 0.6-0.9% mass, 0.2-0.5% mass, the Cu of 0.4-0.8% mass, the Mn of 1.3-1.6% mass, 0.05-
The Zr of the Ti of 0.15% mass, 0-0.15% mass, remaining is Al and the inevitable impurity less than 0.15% mass.
2. a kind of brazed aluminum alloy composite board of the heat exchanger comprising core material described in claim 1, it is characterised in that
The composite board includes skin material, the core material and anticorrosive coat, and the side of the core material is compounded with skin material, and it is 4
Line aluminium alloy；The opposite side of the core material is compounded with anticorrosive coat, and it is AA7072 aluminium alloys.
3. composite board as claimed in claim 2, it is characterised in that answer in the outside that the composite board is located at the anticorrosive coat
Conjunction has the 4 line aluminium alloy skin material.
4. composite board as claimed in claim 2 or claim 3, it is characterised in that every layer of the skin material, the thickness of anticorrosive coat account for described
The ratio of composite board gross thickness is 8-12%.
5. composite board as claimed in claim 4, it is characterised in that the thickness of the composite board is 1.0-2.5mm.
6. composite board as claimed in claim 2, it is characterised in that in the compound interface of the skin material and the core material
Place is formed with the high density Precipitation band of 10-40 μm of thickness.
7. composite board as claimed in claim 2, it is characterised in that yield strength is not less than after the composite board soldering
55MPa。
8. composite board as claimed in claim 2, it is characterised in that composite board soldering side SWAAT salt fogs after the soldering
The aperture time is more than 28 days first for corrosion.
9. a kind of method for preparing the composite board described in any one of claim 2 to 8, it is characterised in that methods described includes
Step：
The skin material, core material and anticorrosive coat ingot casting are prepared respectively；
To the core material Homogenization Treatments；
By heating rolling after the skin material and anticorrosive coat ingot mill surface into certain thickness sheet material, by skin material, core material and anti-corrosion
The order of layer is stacked and method hot rolling；
Cold rolling is carried out to the composite board after the method hot rolling；
Composite board after the cold rolling is made annealing treatment.
10. method as claimed in claim 9, it is characterised in that the raw material of the core material is from the composite board
One or more among leftover pieces and fine aluminium, pure silicon, manganese agent, aluminum bronze intermediate alloy, aluminium titanium intermediate alloy, aluminium zirconium hardener
Composition allotment is formed, and the leftover pieces of the composite board account for the 30%-45% of the raw material gross weight.
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| CN111823665A (en) * | 2020-07-09 | 2020-10-27 | 大力神铝业股份有限公司 | High-strength corrosion-resistant multilayer composite material for water tank and warm air pipe and processing technology thereof |
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