• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for producing an aluminum multilayer brazing sheet which comprises a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of an alloy 4xxx on one or both sides of the core, and optionally an intermediate layer between the core and the solder layer on one or both sides of the core, the method comprising the following successive steps: - providing the layers to assemble or the simultaneous casting of the layers to obtain a sandwich; rolling the resulting sandwich to obtain a sheet; and - treating the surface of the sheet with an alkaline or acidic stripper.
    公开号:FR3074717A1
    申请号:FR1762018
    申请日:2017-12-12
    公开日:2019-06-14
    发明作者:Bechir Chehab；Carole Loable
    申请人:Constellium Neuf Brisach SAS；
    IPC主号:
    专利说明:

    ALUMINUM MULTILAYER BRAZING SHEET FOR FLOWLESS BRAZING
    The present invention relates to a pretreated multilayer brazing sheet, its use in a brazing process without flux under controlled atmosphere (CAB), a method of producing said sheet and a method of producing a brazed part.
    There are various brazing processes used to manufacture industrial heat exchangers based on aluminum and aluminum alloy.
    There is vacuum brazing which is performed at a relatively low pressure of the order of about 1 x 10 -4 mbar or less. It is a discontinuous process and the requirement is high with regard to the cleanliness of the materials. In order to obtain optimal conditions for a joint to be formed, the aluminum alloys commonly used for vacuum brazing contain an intentional addition of 1% Mg or more. The Mg dislocates the hard oxide film of the filler alloy when it evaporates from the brazing sheet during brazing, and then the evaporated Mg removes the oxygen and moisture that remains in the oven vacuum brazing. However, there is always more magnesium present in the oven than necessary. Excess magnesium condenses on cold spots in the vacuum brazing furnace and must be removed frequently. The capital investment for appropriate equipment is relatively high. Another known brazing method is controlled atmosphere brazing (CAB) usually used with a flux. The Nocolok® flux (flux based on potassium fluoroaluminate) is widely used in industrial brazing under controlled atmosphere (CAB) of aluminum-based heat exchangers. The molten flux facilitates soldering by breaking the oxide layer on the surfaces and also prevents further oxidation of the molten layer.
    Recently, some heat exchangers (in particular with a refrigerant circulation) have presented clogging problems linked to a chemical interaction which occurs between the residual flux (flux remaining after brazing) and the coolant. This interaction leads to an increase in the viscosity of the coolant and, consequently, to a clogging of the heat exchanger. Specifically, excess flux residues after brazing can increase "abrasion" in service when coolant is flowing through the heat exchanger.
    In addition, in the particular case of a water charge air cooler (WCAC) or a radiator, flux particles on the brazed surfaces in contact with the coolant can be released and clog the tubes, and it has also been reported to accelerate the degradation of certain coolants to form gels.
    In addition to this clogging problem, the Nocolok® flux also presents certain problems for health and the environment.
    In addition, in structures with a complex shape, the application of a brazing flux before brazing inside the structure is often considered very difficult and problematic, which sometimes leads to an increase in the amount of flux and therefore an increase in the amount of flux residues.
    Therefore, solutions for brazing in a fluxless controlled brazing (CAB) process have been developed, as illustrated below.
    Patent application EP 1 430 988 A1 from Furukawa discloses that for such a CAB process without the use of a brazing flux, the brazing sheet has an aluminum or aluminum alloy core coated with a layer filler alloy composed of an Al-Si based alloy on one or both sides thereof, and contains Mg at least in a layer constituting the brazing sheet other than the alloy layer contributed.
    Patent application EP 2 660 043 A1 and patent EP 2 844 466 of Hydro Aluminum Rolled Product GmbH discloses an aluminum brazing sheet product in which the Al-Si filler layer is etched to facilitate brazing without flux. The pickling of the Al-Si filler layer includes an alkaline or acidic stripper.
    Patent application EP 2 883 650 Al from Hydro Aluminum Rolled Product GmbH discloses a pretreatment of an aluminum brazing sheet for fluxless brazing, in which the surface of the aluminum filler layer is treated with a solution acid aqueous pickling comprising at least one mineral acid and at least one complexing agent or a complexing mineral acid. The preferred Al-Si filler materials are selected from the group comprising AA4343, AA4045 and ΆΑ4047.
    Patent application WO 2017/080771 by Aleris discloses a multilayer heat exchanger having a core of AA3003 / AA3005 / AA3105 / AA3103 coated on both sides with a brazing layer AA4045, pickled with an acid pickling solution.
    However, it should be noted that solutions without flux must sometimes be tolerant to flux because flux residues can remain in the oven or certain specific zones can be locally subjected to flux. This is particularly important for industrial production, because a flux tolerant solution allows the use of existing soldering equipment, even those sometimes using flux. In addition, for certain specific uses, certain parts of a part are subjected to a flow, while the other parts of the same part are not.
    There is therefore still a demand for an improved process for brazing without flux under controlled atmosphere (CAB), in particular for stabilizing the performance of brazing and for proposing solutions without flux but tolerant to flux.
    As will be understood below in this document, unless otherwise indicated, aluminum alloy designations and metallurgical condition designations refer to the designations of the Aluminum Association in Aluminum Standards and
    Data and Registration Records, published by the Aluminum Association and well known to those of skill in the art.
    For any description of preferred alloy compositions or alloy compositions, all references to percentages are by weight unless otherwise indicated.
    And in the context of the present invention, and as used below in the present document, the term “brazing under controlled atmosphere” or “CAB” refers to a brazing process which uses an inert atmosphere, for example of nitrogen, argon or helium, when brazing various alloy articles, and is distinct from vacuum brazing, in particular in that, with CAB, the brazing atmosphere in the furnace the brazing operation is approximately at normal atmospheric pressure, although a slight underpressure (for example, working at a pressure of 0.1 bar or more), or a slight overpressure can be used to facilitate control of the atmosphere of the brazing furnace.
    An object of the present invention is to provide a use of a pretreated aluminum brazing sheet having a specific composition in brazing without flux under controlled atmosphere (CAB). The solution according to the present invention allows stabilization of the brazing performance. It should also be noted that the solution according to the present invention is tolerant to flow.
    This object and others and additional advantages are satisfied or exceeded by the present invention providing:
    a process for producing a multilayer aluminum brazing sheet which comprises a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of a 4xxx alloy on a or the two faces of the core, and optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, the method comprising the following successive steps:
    - the supply of the layers to be assembled or the simultaneous casting of the layers to obtain a sandwich;
    - rolling the resulting sandwich to obtain a sheet; and
    - treatment of the surface of the sheet with an alkaline or acid stripper;
    - a multilayer aluminum brazing sheet comprising:
    - a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg;
    - a brazing layer made of a 4xxx alloy comprising Bi on one or both sides of the core; and
    - optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, in which the aluminum multi-layer brazing sheet is treated on the surface with an alkaline or acid stripper before a brazing step;
    a use of an aluminum multilayer brazing sheet in a brazing process without flux under controlled atmosphere (CAB), in which the aluminum multilayer brazing sheet is as obtained according to the process as described below, to stabilize brazing performance;
    - a process for producing a brazed part, comprising the following successive steps:
    the supply of at least one aluminum multilayer brazing sheet comprising a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of a 4xxx alloy on one or the two sides of the core, and optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, in which the multilayer aluminum brazing sheet is surface treated with an alkaline stripper or acid; and
    - brazing according to a brazing process without flux under controlled atmosphere (CAB).
    Figures 1 and 2 show brazing samples in a V configuration as mentioned in the examples.
    Figure 2 is a side view of Figure 1 according to arrow A.
    Soul
    The aluminum multilayer brazing sheet used according to the present invention comprises a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg. Preferably, the higher content of Mg in the core is strictly less than 0.20% by weight, more preferably less than or equal to 0.18% by weight.
    It should be noted that the quantity of Mg in the core according to the present invention makes it at the same time a solution without flux and a solution tolerant to flux. Preferably, the core used according to the present invention more preferably comprises essentially, in% by weight:
    If: up to 0.7%, preferably less than 0.3%, more preferably from 0.1 to 0.3%;
    Fe: up to 0.7%, preferably less than 0.3%, more preferably up to 0.2%;
    Cu: 0.3 to 1.1%, preferably 0.6 to 0.95%, more preferably 0.6 to 0.9%;
    Mn: 0.5 to 1.8%, preferably 0.7 to 1.8%, more preferably 1.0 to 1.7%, in particular 1.1 to 1.7%;
    Ti: up to 0.3%, preferably up to 0.25%, more preferably 0.06 to 0.1%;
    Mg: 0.1 to 0.25%;
    Zn: up to 0.1%;
    Zr and / or Cr and / or V: each up to 0.3%;
    other items less than 0.05% each and less than 0.15% in total; the rest being aluminum.
    Brazing layer
    The aluminum multilayer brazing sheet used according to the present invention is coated on one or both sides with a brazing layer made of a 4xxx alloy.
    Preferably, the brazing alloy used according to the present invention comprises Bi. The Bi content in the brazing layer is preferably up to 0.3% by weight, more preferably from 0.1 to 0.3% by weight, in particular from 0.11 to 0.17% by weight.
    Preferably, the brazing layer used according to the present invention comprises, more preferably consists essentially of, in% by weight:
    If: 7 to 13%, preferably 9 to 11%;
    Fe: up to 0.7%, preferably up to 0.6%;
    Cu: up to 0.5%, preferably up to 0.3%, more preferably up to 0.1%;
    Bi: up to 0.3%, preferably 0.1 to 0.3%, more preferably 0.11 to 0.17%;
    Sr: up to 500 ppm, preferably up to
    200 ppm;
    other items less than 0.05% each and less than 0.15% in total; the rest being aluminum.
    Intermediate layer
    Optionally, the aluminum multilayer brazing sheet used according to the present invention further comprises an intermediate layer which is present between the core and the brazing layer, on one or both sides of the core. According to one embodiment, in the configurations with four or five layers with only one brazing layer, the intermediate layer can be present alone on the face of the core where the brazing layer is not present.
    According to one embodiment, the intermediate layer used according to the present invention may comprise, preferably may consist essentially of, in percentage by weight:
    until 0, 5 O. Ό of Yes, until 0.7 o, O of Fe, until 0, 3 O. O of Cu, until 1.5 O,O of mn, until 1% of Mg, until 0.3 O, Ό of Ti,
    other elements less than 0.05% each and less than 0.15% in total, the rest being aluminum
    Preferably, the upper limit of Mg in the intermediate layer is 0.3% by weight, preferably 0.25% by weight. In this embodiment, the solution according to the present invention is tolerant to flows. For example, an intermediate layer can be used to limit the diffusion of the alloying elements between the core and the brazing layer and / or to further improve the post-brazing corrosion performance of the material of the brazing sheet.
    sheet metal
    The aluminum brazing sheet according to the present invention can have two, three, four or five layers. The two-layer configuration is a sheet made up of a core and a brazing layer as described previously in this document.
    The three-layer configuration is a sheet made up of a core and:
    - two brazing layers, each on one face of the core, having identical or different compositions; or
    - of a layersoldering and alayer intermediate, all both sure the even opposite 1 soul; or - of a layer of brazing sure a face and a layer intermediate on the other face of 1 soulor - of a layer of brazing sure a face and a
    sacrificial layer on the other side of the core, the sacrificial layer being, for example, made of AAlxxx or AA7xxx having a low Zn content (for example, an alloy having about 1 to 4% by weight de Zn or AA7072).
    The four-layer configuration is a sheet made up of a core, a brazing layer and an intermediate layer both on one face of the core and:
    - a brazing layer on the other face of the core, the brazing layers having identical or different compositions; or
    - an intermediate layer on the other side of the core; or
    - a sacrificial layer on the other side of the core.
    The five-layer configuration is a sheet made up of a core, a brazing layer and an intermediate layer both on one face of the core and:
    - an intermediate layer and a brazing layer both on the other face of the core, the intermediate layers and the brazing layers respectively having the same composition or a different composition; or
    - a sacrificial layer and a brazing layer both on the other face of the core, the brazing layers having the same composition or a different composition and being the outer layers of the sheet; or
    - An intermediate layer and a sacrificial layer both on the other face of the core, and the intermediate layers having the same composition or a different composition and the sacrificial layer being an outer layer of the sheet.
    The thickness of the aluminum multilayer brazing sheet may be in the range from 0.1 to 3 mm, preferably from 0.15 to 2 mm, more preferably from 0.2 to 1.5 mm.
    The proportion of the brazing layer can be from 5 to 15% of the total thickness of the multilayer aluminum brazing sheet.
    For example, the metallurgical state of the aluminum multilayer brazing sheet may be H24, H116 or O. The metallurgical state is known to the skilled person and is described in standard NF EN 515 of October 25 1993.
    Process
    The aluminum multi-layer brazing sheet used according to the present invention can be produced by various techniques. For example, laminating the layers to be joined is well known in the art. As a variant, the brazing layer and the optional intermediate layer can be applied to the core by means of thermal spraying techniques. Alternatively, alternatively, the core, the brazing layer and the optional intermediate layer can be produced by means of casting and molding techniques, for example as disclosed in the international application of WO 2004/112 992, followed by rolling.
    An object of the present invention is a method for producing a multilayer aluminum brazing sheet which comprises a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of '' a 4xxx alloy on one or both sides of the core, and optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, the method comprising the following successive steps:
    - the supply of the layers to be assembled or the simultaneous casting of the layers, to obtain a sandwich;
    - rolling the resulting sandwich to obtain a sheet; and
    - treatment of the surface of the sheet with an alkaline or acid stripper.
    As is known to a person skilled in the art, the rolling can be a hot and / or cold rolling, under conditions known to a person skilled in the art. The rolling time and conditions depend mainly on the desired thickness of the sheet.
    The sheet may have been optionally produced using a homogenized core and / or one or more homogenized intermediate layers.
    The sheet can be optionally preheated before the rolling step, partially or fully annealed, and / or work hardened.
    Preferably, at least one brazing layer comprises Bi, more preferably up to 0.3% by weight of Bi.
    In the case where two brazing layers are present, they can have the same composition or different compositions.
    In the case where two intermediate layers are present, they can have the same composition or different compositions.
    The core, the brazing layer, the intermediate layer and the sheet are identical to those described previously in this document.
    The surface of the multilayer aluminum brazing sheet thus obtained is treated with an alkaline or acidic stripper before the brazing process.
    Preferably, the surface of the multilayer aluminum brazing sheet is treated with an acid stripper. The acid stripper preferably comprises 10 to 20, more preferably 12 to 16, for example 14 g / 1 of H2SO4 and 0.5 to 5, more preferably 1 to 3, for example 2 g / 1 of HF (5%).
    The acid stripper can comprise at least one of the following mineral acids: H2SO4, H3PO4, HCl, HF and / or HNO3. Preferably, the acid stripper is a mixture of H2SO4 and HF. The acid stripper is generally in the form of a solution and the mineral acid content is generally from 0.5 to 20% by weight.
    According to another embodiment, the stripper can be alkaline. The alkaline stripper can comprise at least one of the following species: NaOH and / or KOH. The alkaline stripper is generally in the form of a solution and the alkaline content is generally 0.5 to 20% by weight.
    The alkaline stripper may further comprise surfactants (e.g., anionic surfactants such as alkylbenzene sulfonates, alkyl sulfates, alkyl ethersulfates; cationic surfactants such as monoalkylated quaternary systems or esterquats; non-ionic surfactants such as with an ester, ether or amide bond (for example, glycol esters); or amphoteric surfactants such as imidazoline derivatives or polypeptides) or complexing agents (for example, sodium gluconate, sorbitol, mucic acid or gum arabic).
    The alkaline remover should generally be rinsed with an acid, for example nitric or sulfuric acid.
    The surface treatment with a stripper generally lasts from 1 second to 5 minutes, preferably from 3 to 80 s, more preferably from 5 to 50 s.
    The temperature during this surface treatment is generally from 20 to 100 ° C, preferably from 30 to 80 ° C, more preferably from 50 to 80 ° C.
    During the surface treatment, the quantity of aluminum removed from the brazing layer is from 1 to 1000 mg / m 2 / side, preferably from 5 to 500 mg / m 2 / side, more preferably from 5 to 300 mg / m 2 / side.
    Another object of the present invention is a multilayer aluminum brazing sheet comprising:
    - a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg;
    - a brazing layer made of a 4xxx alloy comprising Bi, on one or both sides of the core; and
    - optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, in which the aluminum multilayer brazing sheet is treated on the surface with an alkaline or acid stripper before a brazing step, preferably before a brazing step without flux under a controlled atmosphere.
    In the case where two brazing layers are present, they can have the same composition or different compositions.
    In the case where two intermediate layers are present, they can have the same composition or different compositions.
    The core, the brazing layer, the intermediate layer and the sheet are identical to those described previously in this document.
    The sheet obtained according to the present invention can then be brazed with itself and / or with other aluminum alloy products to obtain a brazed part, by brazing under a controlled atmosphere. The soldering temperature can generally be in a range from about 560 ° C to 640 ° C, preferably from 590 ° C to 610 ° C, for example to about 590 ° C, to about 600 ° C or to about 610 ° C.
    The inert gas atmosphere for brazing must be anhydrous, which means that the dew point is less than -35 ° C, preferably less than -40 ° C, and more preferably -45 ° C or less.
    The atmosphere for soldering can include, for example, up to 60 ppm O2.
    The core, the brazing layer, the intermediate layer and the sheet are identical to those
    previously described in the this document. Another object of the present invention is the use of a sheet metal of brazing multilayer in aluminum in a brazing without flow under atmosphere
    controlled (CAB), in which the aluminum multilayer brazing sheet is as obtained according to the method described previously in this document, to stabilize the brazing performance.
    Another object of the present invention is a method for producing a brazed part, comprising the following successive steps:
    the supply of at least one aluminum multilayer brazing sheet comprising a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of a 4xxx alloy on one or the two sides of the core, and optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, in which the multilayer aluminum brazing sheet is surface treated with an alkaline stripper or acid; and
    - brazing in a brazing process without flux under controlled atmosphere (CAB).
    The methods, the use and the sheet according to the present invention have proved to be particularly advantageous in the production of heat exchangers having very high requirements with regard to internal cleanliness, in particular oil coolers and coolers. charge air. These heat exchangers are not suitable for production by vacuum brazing, mainly for economic reasons.
    The invention is not limited to the embodiments described in the preceding description or in the following examples, and can be widely modified within the limits of the invention as defined by the appended claims.
    Example
    1) Preparation of materials:
    All the samples tested were aluminum multilayer brazing sheets having a core (80% of the total thickness) coated on both sides with a brazing layer (10% of the total thickness each). They were in metallurgical state O and had a total final thickness of 0.42 mm.
    The sandwiches were prepared as follows:
    - pour in the laboratory (open ingot mold with direct water cooling) different alloys to obtain blocks with a thickness of 70 mm;
    - scaling the blocks obtained on both sides to a thickness of 55 mm;
    - preheat the coating alloy blocks to 500 ° C and hot roll to a thickness of 7 mm;
    - homogenize the core alloy blocks at 620 ° C for 8 hours;
    - assemble the sandwiches;
    - preheat the assembled sandwich to 500 ° C and laminate hot to a thickness of 3.5 mm;
    - cold roll to a thickness of 0.42 mm;
    - anneal at 350 ° C under an N 2 atmosphere for 1 hour to obtain a metallurgical state O.
    The samples were then treated on the surface with an acid solution comprising 14 g / 1 of H2SO4 and 2 g / 1 of HF (5%) at 50 ° C for different periods ranging from 0 to 70 s.
    Table 2 below presents the details of the samples tested.
    Table 1 shows the specific compositions of the alloys for the cores and the brazing layers as used in the examples, in percentage by weight.
    Yes Fe Cu mn mg Ti Sr Bi Ame-1 0.2 0.15 0.71 1.32 0.16 0.08 - - Soul-2 0.18 0.15 0.65 1.35 - 0.08 -Soul-3 0.5 0.15 0, 5 1, 64 0.5 0.08- Coating-1 9.8 0.4- - -- Siding 2 9.5 0.3 0.2 - - 0.02 0.01 0.14
    Table 1: specific compositions of the alloys tested
    2) Brazing
    The tests were carried out using a brazing test in a V configuration on a test piece in a discontinuous laboratory brazing furnace with the following test conditions:
    • no addition of flux to the samples before brazing;
    • N 2 atmosphere;
    • O2 less than 15 ppm;
    • 600 ° C for 3 minutes;
    • heating up to 9 ° C / minute.
    The shape in
    V, each side of the V measuring 30 mm in length and 1 cm in height, was positioned on a test tube having a stainless steel rod with a diameter of 1.2 mm inserted under the corner of the V as illustrated by the figures and
    2.
    The test pieces had the same composition as the
    V (i.e. Figures 1 and
    2, the test piece has the reference number 1, the V has the reference number 2, the stainless steel rod has the reference number 3, and the brazing zone is represented by the arrow with the reference number 4.
    Figure 2 is a side view of Figure 1 according to arrow A.
    The results of the V test corresponded to the average brazed length (in mm) measured along the brazing zone (average of the brazed lengths on the left and right side of the V). For each sample, several tests were conducted to verify the reproducibility of the results. In Table 3 below, NR means “not reproducible” and relates to the samples for which sometimes no brazing was obtained and sometimes at least a partial brazing occurred.
    3) Results
    Table 2 below presents the samples tested and the results obtained.
    Soul Brazing layer Pickling time(S) Joint formation (mm) V-test al Soul-2 Siding 2 0 1 A2 40 1 A3 50 1 B1 Soul-3 Siding 2 0 NR B2 70 1 Cl Ame-1 Siding 2 0 NR C2 25 11.4 C3 40 11.4 C4 50 11.4 C5 60 10.2 C6 70 9.7 DI Central part-1 Coating-1 0 1 D2 25 11.1 D3 40 13 D4 50 11.4
    Table 2: samples tested and results obtained
    As shown in Table 2 above, samples C2 to C6 and D2 to D4 were according to the invention. Samples Al, Bl, Cl and DI were comparative examples at least because of the absence of surface treatment. Samples Ά2 and A3 were comparative examples at least because the core-2 did not contain enough Mg. Sample B2 was a comparative example at least because the core-3 contained too much Mg.
    According to Table 2, surface treatment is necessary to stabilize the performance of the soldering. Indeed, the quality of the soldering was unstable (that is to say, not reproducible) for the sample C1 and not good for the samples Al, Bl and DI. Good brazing quality is therefore not guaranteed without a surface treatment.
    Then, the amount of Mg claimed is necessary to stabilize the performance of the soldering. Indeed, with Mg in insufficient quantity (see examples A2 and A3) or with Mg in too high quantity (see example B2), the quality of the brazing was not good.
    The Mg content of the core and the surface treatment according to the present invention therefore together allow a good quality of brazing by stabilizing the brazing performance.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. A method of producing a multilayer aluminum brazing sheet which comprises a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of a 4xxx alloy on a or the two faces of the core, and optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, the method comprising the following successive steps:
    - the supply of the layers to be assembled or the simultaneous casting of the layers to obtain a sandwich;
    - rolling the resulting sandwich to obtain a sheet; and
    - treatment of the surface of the sheet with an alkaline or acid stripper.
    [2" id="c-fr-0002]
    2. Method according to claim 1, in which the alloy 3xxx of the core comprises, in% by weight: up to 0.7% of Si, up to 0.7% of Fe, 0.3 to 1 , 1% Cu, 0.5 to 1.8% Mn, up to 0.3% Ti, 0.1 to 0.25% Mg, up to 0.1% Zn, Zr and / or Cr and / or V each up to 0.3%, other elements less than 0.05% each and less than 0.15% in total, the rest being aluminum.
    [3" id="c-fr-0003]
    3. Method according to claim 1 or 2, wherein the core comprises 0.1 to 0.18% by weight of Mg.
    [4" id="c-fr-0004]
    4. Method according to any one of the preceding claims, in which the 4xxx alloy of the brazing layer comprises, in% by weight: 7 to
    13% Si, up to 0.7% Fe, up to 0.5% Cu, up to 0.3% Bi, up to 500 ppm Sr, other elements within 0.05% each and less than 0.15% in total, the rest being aluminum.
    [5" id="c-fr-0005]
    5. Method according to any one of the preceding claims, in which the intermediate layer comprises, in% by weight: up to 0.5% of Si, up to 0.7% of Fe, up to 0.3 % Cu, up to 1.5% Mn, up to 1% Mg, up to 0.3% Ti, other elements less than 0.05% each and less than 0, 15% in total, the rest being aluminum
    [6" id="c-fr-0006]
    6. Method according to any one of the preceding claims, in which the surface of the sheet is treated with an acid stripper.
    [7" id="c-fr-0007]
    7. Method according to any one of the preceding claims, in which the acid stripper is a mixture of H2SO4 and HF.
    [8" id="c-fr-0008]
    8. Method according to any one of the preceding claims, in which the surface of the sheet is treated at a temperature of 20 to 100 ° C for 3 to 80 s.
    [9" id="c-fr-0009]
    9. Multilayer aluminum brazing sheet comprising:
    - a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg;
    - a brazing layer made of a 4xxx alloy comprising Bi on one or both sides of the core; and
    - optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, in which the aluminum multilayer brazing sheet is treated on the surface with an alkaline or acid stripper before a brazing step.
    [10" id="c-fr-0010]
    10. Use of a multi-layer aluminum brazing sheet in a fluxless brazing process under controlled atmosphere (CAB), in which the multi-layer aluminum brazing sheet is as obtained according to the process of claims 1 to 8, for stabilize brazing performance.
    [11" id="c-fr-0011]
    11. Method for producing a brazed part, comprising the following successive steps:
    the supply of at least one aluminum multilayer brazing sheet comprising a core made of a 3xxx alloy comprising 0.1 to 0.25% by weight of Mg, a brazing layer made of a 4xxx alloy on one or the two sides of the core, and optionally an intermediate layer between the core and the brazing layer on one or both sides of the core, in which the multilayer aluminum brazing sheet is surface treated with an alkaline stripper or acid; and
    - brazing according to a brazing process without flux under controlled atmosphere (CAB).
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    同族专利:
    公开号 | 公开日
    CN111448028A|2020-07-24|
    EP3723935A1|2020-10-21|
    CA3084103A1|2019-06-20|
    JP2021505404A|2021-02-18|
    WO2019115422A1|2019-06-20|
    US20210170532A1|2021-06-10|
    FR3074717B1|2019-11-08|
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    法律状态:
    2018-12-26| PLFP| Fee payment|Year of fee payment: 2 |
    2019-06-14| PLSC| Publication of the preliminary search report|Effective date: 20190614 |
    2019-12-26| PLFP| Fee payment|Year of fee payment: 3 |
    2020-12-27| PLFP| Fee payment|Year of fee payment: 4 |
    2021-12-27| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1762018|2017-12-12|
    FR1762018A|FR3074717B1|2017-12-12|2017-12-12|ALUMINUM MULTILAYER SOLDER FOR BRAZING WITHOUT FLOW|FR1762018A| FR3074717B1|2017-12-12|2017-12-12|ALUMINUM MULTILAYER SOLDER FOR BRAZING WITHOUT FLOW|
    PCT/EP2018/084091| WO2019115422A1|2017-12-12|2018-12-10|Aluminium multilayer brazing sheet for fluxfree brazing|
    EP18822020.6A| EP3723935A1|2017-12-12|2018-12-10|Aluminium multilayer brazing sheet for fluxfree brazing|
    JP2020532000A| JP2021505404A|2017-12-12|2018-12-10|Flux-free brazing aluminum multi-layer brazing sheet|
    US16/771,611| US20210170532A1|2017-12-12|2018-12-10|Aluminium multilayer brazing sheet for fluxfree brazing|
    CN201880077768.5A| CN111448028A|2017-12-12|2018-12-10|Aluminium multi-layer brazing sheet for fluxless brazing|
    CA3084103A| CA3084103A1|2017-12-12|2018-12-10|Aluminium multilayer brazing sheet for fluxfree brazing|
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