KR20040098812A - Flux composition for brazing Al-Mg alloy and Brazing method using the same - Google Patents

Flux composition for brazing Al-Mg alloy and Brazing method using the same Download PDF

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KR20040098812A
KR20040098812A KR1020030031089A KR20030031089A KR20040098812A KR 20040098812 A KR20040098812 A KR 20040098812A KR 1020030031089 A KR1020030031089 A KR 1020030031089A KR 20030031089 A KR20030031089 A KR 20030031089A KR 20040098812 A KR20040098812 A KR 20040098812A
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brazing
aluminum
fluoride
magnesium alloy
mixture
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KR1020030031089A
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Korean (ko)
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KR100518787B1 (en
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신기철
김성묵
박무규
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정진화학공업 주식회사
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/28—Floor-scrubbing machines, motor-driven
    • A47L11/282—Floor-scrubbing machines, motor-driven having rotary tools
    • A47L11/283—Floor-scrubbing machines, motor-driven having rotary tools the tools being disc brushes
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4036—Parts or details of the surface treating tools
    • A47L11/4038—Disk shaped surface treating tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/408—Means for supplying cleaning or surface treating agents
    • A47L11/4086—Arrangements for steam generation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4094—Accessories to be used in combination with conventional vacuum-cleaning devices

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  • Pressure Welding/Diffusion-Bonding (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

PURPOSE: A flux composition for brazing an aluminum magnesium alloy and a brazing method using the same are provided to improve weldability without forming composition having a high melting temperature. CONSTITUTION: A flux composition for brazing an aluminum magnesium alloy is made by mixing aluminum fluoride carbonate with lithium fluoride by using water as solvent, thereby forming a mixture(S10). The mixture is coated on a surface of a product made from an aluminum magnesium alloy(S12). Then, the mixture coated on the surface of the product is dried(S14). The mixture is subject to a brazing process by aligning the mixture in a brazing furnace(S16). The mixture includes 95 to 99.9 weight percent of aluminum fluoride carbonate and 0.1 to 5 weight percent of fluoride lithium.

Description

용접성을 향상시키는 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물 및 이를 이용한 브레이징 방법{Flux composition for brazing Al-Mg alloy and Brazing method using the same}Flux composition for brazing Al-Mg alloy and Brazing method using the same}

본 발명은 용접성을 향상시키는 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물 및 이를 이용한 브레이징 방법에 관한 것으로, 보다 상세하게는 대상물에 도포하여 브레이징을 수행함으로써 용접을 위한 클래드재의 모재로의 침투를 용이하게 함으로써 용접성을 향상시키는 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물 및 이를 이용한 브레이징 방법에 관한 것이다.The present invention relates to a flux composition for aluminum-magnesium alloy brazing to improve weldability and a brazing method using the same. It relates to a flux composition for brazing aluminum-magnesium alloy and a brazing method using the same.

차량에 장착되는 라디에이터, 콘덴서, 히터, 증발기, 오일쿨러 또는 인터쿨러 등의 공조기기들을 기계적 강도 및 내식성을 향상시키기 위하여 알루미늄 합금을 주로 사용한다.Aluminum alloys are mainly used to improve mechanical strength and corrosion resistance of air conditioners such as radiators, condensers, heaters, evaporators, oil coolers, or intercoolers mounted on vehicles.

특히, 제조원가를 절감하고 기계적 강도 및 내식성을 그대로 유지하기 위하여 합금원소로써 마그네슘을 적용하여 알루미늄-마그네슘(Al-Mg) 합금이 주로 이용된다.In particular, in order to reduce manufacturing cost and maintain mechanical strength and corrosion resistance, aluminum-magnesium (Al-Mg) alloy is mainly used by applying magnesium as an alloying element.

이와 같은 알루미늄-마그네슘 합금으로 된 공조기기들을 브레이징하는 데에는 일반적으로 불화물계 플럭스인 불화알루미늄칼륨(K2AlF4+ K2AlF5·H2O)이 사용된다.In brazing air conditioners made of such an aluminum-magnesium alloy, fluoride-based potassium aluminum fluoride (K 2 AlF 4 + K 2 AlF 5 H 2 O) is generally used.

그러나, 알루미늄-마그네슘 합금의 공조기기의 표면에 불화알루미늄칼륨 플럭스를 도포하고 브레이징을 수행하면, 불화알루미늄칼륨 플럭스와 마그네슘이 반응하여 고융점의 화합물이 생성된다.However, when potassium aluminum fluoride flux is applied to the surface of an air conditioning apparatus of an aluminum-magnesium alloy and brazing is performed, the potassium aluminum fluoride flux and magnesium react to produce a compound having a high melting point.

즉, 반응식을 보면 다음과 같다.That is, the reaction is as follows.

2KAlF4+ 3Mg -> 2KMgF4+ MgF2+ 2Al2KAlF 4 + 3Mg-> 2KMgF 4 + MgF 2 + 2Al

따라서, 2KMgF4+ MgF2의 고융점 화합물이 생성된다.Thus, a high melting point compound of 2KMgF 4 + MgF 2 is produced.

이 고융점 화합물은 용융온도가 대략 1,200℃가 되므로, 브레이징 공정온도인 250 내지 630℃의 온도범위 내에서는 용융되지 않고 잔존하므로 이것에 의해 용접성이 저하되는 결과를 가져온다.Since this high melting point compound has a melting temperature of approximately 1,200 ° C., the melting point remains unmelted within a temperature range of 250 to 630 ° C., which is a brazing process temperature, thereby resulting in a decrease in weldability.

따라서, 본 발명의 목적은 알루미늄-마그네슘 합금으로 된 대상기기를 브레이징하는 과정에서 고융점 화합물이 생성되지 않도록 하여 용접성을 향상시킬 수 있는 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물 및 이를 이용한 브레이징 방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a flux composition for brazing aluminum-magnesium alloy and brazing method using the same, which can improve weldability by preventing a high melting point compound from being generated during brazing a target device made of aluminum-magnesium alloy. will be.

본 발명의 다른 목적과 특징들을 이하에 서술되는 바람직한 실시예를 통하여 보다 명확하게 이해될 것이다.Other objects and features of the present invention will be more clearly understood through the preferred embodiments described below.

도 1은 본 발명의 브레이징 방법을 설명하는 플로우챠트이다.1 is a flowchart illustrating the brazing method of the present invention.

본 발명에 따른 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물은 불화알루미늄칼륨과 불화리튬을 혼합하여 제조한다.The flux composition for aluminum-magnesium alloy brazing according to the present invention is prepared by mixing potassium aluminum fluoride and lithium fluoride.

바람직하게, 플럭스용 조성물은 불화알루미늄칼륨 95 내지 99.9 중량%와 불화리튬 0.1 내지 5 중량%의 비율로 혼합되어 제조된다.Preferably, the flux composition is prepared by mixing 95 to 99.9% by weight of potassium aluminum fluoride and 0.1 to 5% by weight of lithium fluoride.

본 발명에 따른 브레이징 방법에 따르면, 불화알루미늄칼륨과 불화리튬을 물을 용제로 하여 혼합하고, 이 혼합물을 알루미늄-마그네슘 합금 소재의 대상기기에 도포하여 건조한 후, 대상기기를 브레이징로에서 브레이징한다.According to the brazing method according to the present invention, potassium aluminum fluoride and lithium fluoride are mixed with water as a solvent, and the mixture is applied to a target device of aluminum-magnesium alloy material and dried, and then the target device is brazed in a brazing furnace.

바람직하게, 건조공정은 100 내지 250℃의 온도범위 내에서 수행되며, 브레이징 공정은 250 내지 630℃의 온도범위 내에서 수행된다.Preferably, the drying process is carried out in a temperature range of 100 to 250 ℃, the brazing process is carried out in a temperature range of 250 to 630 ℃.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

본 발명에 따르면, 불화알루미늄칼륨(K2AlF4+ K2AlF5·H2O)과 불화리튬(LiF)을 혼합하여 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물을 형성한다.According to the present invention, potassium aluminum fluoride (K 2 AlF 4 + K 2 AlF 5 · H 2 O) and lithium fluoride (LiF) are mixed to form a flux composition for aluminum-magnesium alloy brazing.

이와 같이 형성된 플럭스 조성물은 비부식성 및 비흡습성의 특성을 가지며, 물에 대해 미세하게 용해되어 수용액 중에서 슬러리 상태로 존재하게 된다.The flux composition thus formed has properties of non-corrosiveness and non-hygroscopicity, and is finely dissolved in water to exist in a slurry state in an aqueous solution.

바람직하게, 플럭스 조성물은 불화알루미늄칼륨 95 내지 99.9 중량%와 불화리튬 0.1 내지 5 중량%의 비율로 혼합되어 제조된다.Preferably, the flux composition is prepared by mixing 95 to 99.9% by weight of potassium aluminum fluoride and 0.1 to 5% by weight of lithium fluoride.

이하, 도 1을 참조하여 본 발명에 따라 알루미늄-마그네슘 합금 브레이징용 플럭스를 이용하여 브레이징하는 방법을 설명한다. 설명의 편의를 위하여 공조기기를 브레이징하는 경우를 예로 든다.Hereinafter, a method of brazing using the flux for brazing an aluminum-magnesium alloy according to the present invention will be described with reference to FIG. 1. For convenience of explanation, take the case of brazing the air conditioning equipment.

먼저, 불화알루미늄칼륨과 불화리튬을, 예를 들어, 물을 용제로 하여 교반기를 이용하여 잘 혼합한다(단계 S10). 이때 바람직하게 95 내지 99.9 중량%의 불화알루미늄칼륨과 0.1 내지 5 중량%의 불화리튬을 적절한 비율로 교반한다.First, potassium aluminum fluoride and lithium fluoride are mixed well using a stirrer, for example, using water as a solvent (step S10). In this case, preferably 95 to 99.9% by weight of potassium aluminum fluoride and 0.1 to 5% by weight of lithium fluoride are stirred at an appropriate ratio.

불화알루미늄칼륨과 불화리튬의 혼합물은 수용액 중에서 슬러리 상태로 존재하며, 알루미늄-마그네슘 합금의 공조기기에 스프레이 방법으로 슬러리 상태의 혼합물을 도포한다(단계 S12). 또한, 대상기기의 종류에 따라 스프레이 방법 대신에 디핑방법을 적용할 수도 있다.The mixture of potassium aluminum fluoride and lithium fluoride is present in a slurry state in an aqueous solution, and the slurry mixture is applied to an air-conditioner of aluminum-magnesium alloy by a spray method (step S12). In addition, the dipping method may be applied instead of the spray method according to the type of the target device.

이와 같이 혼합물을 도포한 다음에는 공조기기를 건조로에 넣고 건조시키는데, 바람직하게 100 내지 250℃의 온도 범위 내에서 건조시킨다(단계 S14).After applying the mixture in this way, the air conditioner is placed in a drying furnace and dried, and preferably dried within a temperature range of 100 to 250 ° C (step S14).

건조공정을 거친 후에 공조기기는 브레이징로로 이송되어 브레이징 공정을 수행한다(단계 S16). 바람직하게, 브레이징은 250 내지 630℃의 온도범위 내에서 수행된다.After the drying process, the air conditioner is transferred to the brazing furnace to perform the brazing process (step S16). Preferably, brazing is performed in a temperature range of 250 to 630 ° C.

일반적으로 알루미늄-마그네슘 합금 간의 용접을 위해 모재(base matal), 알루미늄-실리콘(Al-Si) 재질의 클래드재(filler metal)가 적용되며, 본 발명의 플럭스 조성물은 유동성이 우수하여 브레이징 공정 중에 이와 같은 클래드재가 모재에 대해 용이하게 침투하도록 함으로써 용접성을 향상시키게 된다.Generally, a base metal and a filler metal made of aluminum-silicon (Al-Si) are applied for welding between aluminum-magnesium alloys. By allowing the same clad material to easily penetrate into the base material, the weldability is improved.

실제로 본 발명의 플럭스 조성물을 적용하여 브레이징 공정을 마친 대상기기들에 대하여 수압테스트와 압력테스트를 수행한 결과, 기존의 플럭스 조성물보다 훨씬 우수한 용접성을 보여주었다.In fact, as a result of performing a hydrostatic pressure test and a pressure test on the target devices that completed the brazing process by applying the flux composition of the present invention, it showed much better weldability than the conventional flux composition.

즉, 종래에는 브레이징 공정 중에 고융점의 화합물이 생성되어 잔존함으로써 용접성을 저하시키는데 비하여 본 발명의 플럭스 조성물의 경우에는 이러한 고융점 화합물이 전혀 생성되지 않을 뿐만 아니라 용융점을 그대로 유지하며, 더욱이 유동성이 우수하여 용접성이 오히려 향상된다.That is, in the case of the flux composition of the present invention, the high melting point compound is generated and remains during the brazing process, and thus the weldability is not generated at all, and the melting point is maintained as it is, and the fluidity is excellent. The weldability is rather improved.

이와 같은 단계들을 수행함으로써 고강도의 알루미늄-마그네슘 합금의 공조기기들을 양호하게 브레이징하여 용접할 수 있으며, 이에 따라 생산성이 향상되는 효과가 있다.By performing these steps, the air conditioners of the high-strength aluminum-magnesium alloy can be brazed and welded well, thereby improving productivity.

따라서, 기계적 강도가 우수하고 내식성이 뛰어나면서 가격이 저렴한 마그네슘을 합금원소로 그대로 사용하면서도 우수한 용접성을 얻을 수 있다는 이점이 있다.Therefore, there is an advantage that excellent weldability can be obtained while using magnesium as an alloying element with excellent mechanical strength and excellent corrosion resistance and low cost.

이상에서는 본 발명의 바람직한 실시예에 한정하여 설명하였지만, 당업자의 수준에서 다양하게 변경할 수 있음은 물론이다.In the above description, but limited to the preferred embodiment of the present invention, various changes can be made at the level of those skilled in the art.

예를 들어, 대상기기는 공조기기에 한정되는 것이 아니라 알루미늄-마그네슘 합금을 소재를 이용하며 브레이징 공정을 수행하는 부품에 대해서는 얼마든지 적용할 수 있다.For example, the target device is not limited to the air conditioner, but can be applied to any part that performs a brazing process using a material of aluminum-magnesium alloy.

따라서, 본 발명의 권리범위는 상기한 실시예에 한정되어서는 안되며 이하에 서술되는 청구범위에 의해 판단되어야 한다.Therefore, the scope of the present invention should not be limited to the above embodiment but should be judged by the claims described below.

이상에서 설명한 바와 같이, 본 발명의 플럭스 조성물에 따르면 알루미늄에 대해 기계적 강도가 우수하고 내식성이 뛰어나면서 가격이 저렴한 마그네슘을 합금원소로 그대로 사용하면서도 우수한 용접성을 얻을 수 있다는 이점이 있다.As described above, according to the flux composition of the present invention, excellent weldability can be obtained while using magnesium as an alloying element with excellent mechanical strength, excellent corrosion resistance, and low cost.

또한, 이에 따라 생산성이 증가하고 제조원가가 감소한다는 이점이 있다.In addition, there is an advantage that the productivity increases and the manufacturing cost is reduced accordingly.

Claims (6)

불화알루미늄칼륨과 불화리튬을 혼합하여 제조한 것을 특징으로 하는 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물.A flux composition for aluminum-magnesium alloy brazing, which is prepared by mixing potassium aluminum fluoride and lithium fluoride. 제 1 항에 있어서, 상기 불화알루미늄칼륨 95 내지 99.9 중량%와 상기 불화리튬 0.1 내지 5 중량%의 비율로 혼합되는 것을 특징으로 하는 알루미늄-마그네슘 합금 브레이징용 플럭스 조성물.The flux composition for aluminum-magnesium alloy brazing according to claim 1, wherein 95 to 99.9% by weight of the potassium aluminum fluoride is mixed with 0.1 to 5% by weight of the lithium fluoride. 불화알루미늄칼륨과 불화리튬을 물을 용제로 하여 혼합하는 단계;Mixing potassium aluminum fluoride and lithium fluoride with water as a solvent; 상기 혼합물을 알루미늄-마그네슘 합금 소재의 대상기기에 도포하는 단계;Applying the mixture to a target device of aluminum-magnesium alloy material; 상기 대상기기에 도포된 혼합물을 건조하는 단계; 및Drying the mixture applied to the target device; And 상기 대상기기를 브레이징로에서 브레이징하는 단계를 포함하는 것을 특징으로 하는 알루미늄-마그네슘 합금 브레이징용 플럭스를 이용한 브레이징 방법.Brazing method using the flux for brazing the aluminum-magnesium alloy, characterized in that it comprises the step of brazing the target device in the brazing furnace. 제 3 항에 있어서, 상기 불화알루미늄칼륨 95 내지 99.9 중량%와 상기 불화리튬 0.1 내지 5 중량%의 비율로 혼합하는 것을 특징으로 하는 알루미늄-마그네슘합금 브레이징용 플럭스를 이용한 브레이징 방법.4. The brazing method according to claim 3, wherein the aluminum-magnesium alloy brazing flux is mixed at a ratio of 95 to 99.9 wt% of the potassium aluminum fluoride and 0.1 to 5 wt% of the lithium fluoride. 제 3 항에 있어서, 상기 건조공정은 100 내지 250℃의 온도범위 내에서 수행되는 것을 특징으로 하는 알루미늄-마그네슘 합금 브레이징용 플럭스를 이용한 브레이징 방법.4. The brazing method according to claim 3, wherein the drying step is performed in a temperature range of 100 to 250 ° C. 제 3 항에 있어서, 상기 브레이징 공정은 250 내지 630℃의 온도범위 내에서 수행되는 것을 특징으로 하는 알루미늄-마그네슘 합금 브레이징용 플럭스를 이용한 브레이징 방법.4. The brazing method according to claim 3, wherein the brazing process is performed in a temperature range of 250 to 630 ° C.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100625090B1 (en) * 2005-03-02 2006-09-20 모딘코리아 유한회사 Adhesive sheet for brazing magnesium alloy and method for brazing magnesium and aluminum alloy
KR100865119B1 (en) * 2007-04-03 2008-10-24 주식회사 제이씨 Composition for Brazing for Aluminium Air-conditioning apparatus and Method for Brazing using the same
US9056363B2 (en) 2008-11-25 2015-06-16 Solvay Fluor Gmbh Anticorrosive flux
US9579752B2 (en) 2010-02-10 2017-02-28 Solvay Fluor Gmbh Flux forming an insoluble brazing residue

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100756232B1 (en) * 2006-05-26 2007-09-06 일심알맥스(주) Flux coating method for aluminium part

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100625090B1 (en) * 2005-03-02 2006-09-20 모딘코리아 유한회사 Adhesive sheet for brazing magnesium alloy and method for brazing magnesium and aluminum alloy
KR100865119B1 (en) * 2007-04-03 2008-10-24 주식회사 제이씨 Composition for Brazing for Aluminium Air-conditioning apparatus and Method for Brazing using the same
US9056363B2 (en) 2008-11-25 2015-06-16 Solvay Fluor Gmbh Anticorrosive flux
US9579752B2 (en) 2010-02-10 2017-02-28 Solvay Fluor Gmbh Flux forming an insoluble brazing residue

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