CN103612029A - Intermediate-temperature aluminum brazing flux for brazing of high-magnesium aluminum alloy and preparation method - Google Patents
Intermediate-temperature aluminum brazing flux for brazing of high-magnesium aluminum alloy and preparation method Download PDFInfo
- Publication number
- CN103612029A CN103612029A CN201310512119.2A CN201310512119A CN103612029A CN 103612029 A CN103612029 A CN 103612029A CN 201310512119 A CN201310512119 A CN 201310512119A CN 103612029 A CN103612029 A CN 103612029A
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- CN
- China
- Prior art keywords
- brazing flux
- csf
- brazing
- temperature
- alf
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
Abstract
The invention provides intermediate-temperature aluminum brazing flux for brazing of high-magnesium aluminum alloy. The intermediate-temperature aluminum brazing flux comprises an AlF3-CsF-KF ternary system brazing flux base material, an active substance ZnCl2 and an active substance GeO2. The molar ratio of the component AlF3 to the component CsF to the component KF of the AlF3-CsF-KF ternary system brazing flux base material is 46 to 51.5 to 2.5. The intermediate-temperature aluminum brazing flux comprises, by mass, 93.5% to 96.5% of AlF3-CsF-KF, 3% to 5% ZnCl2 and 0.5% to 1.5% of GeO2. Meanwhile, the invention provides the preparation method of the intermediate-temperature aluminum brazing flux for brazing of the high-magnesium aluminum alloy. The intermediate-temperature aluminum brazing flux has the advantages that the melting point of the brazing flux prepared through the method ranges from 455 DEG C to 480 DEG C, the brazing temperature ranges from 500 DEG C to 525 DEG C, and the brazing flux can be applied to intermediate-temperature aluminum brazing, the activity of the brazing flux is improved, Zn-Al eutectic brazing flux is spread on aluminum alloy with the magnesium content larger than 2% with the help of protection of argon at the temperature of 500 DEG C, and the spreading area can reach 3cm<2> and is much higher than the standard of GB/T11364-1989. The intermediate-temperature aluminum brazing flux can be used in T-type butt welding of aluminum alloy with the magnesium content larger than 2%, and the surfaces of brazing seams of the intermediate-temperature aluminum brazing flux are provided with no air holes and free of slag inclusion.
Description
Technical field
The present invention relates to a kind of brazing material, middle temperature aluminum brazing flux and preparation method that especially a kind of soldering high-magnesium aluminum alloy is used.
Background technology
Aluminium and aluminium alloy have good physics, chemical property, good processing characteristics, are widely used in the industries such as Aero-Space, automobile, electrical equipment and boats and ships.In recent years, along with the lightweight development of machine-building, aluminium alloy containing magnesium has obtained application more widely.But, because aluminium alloy especially high-magnesium aluminum alloy surface very easily generates the oxide-film of one deck densification, cause soldering more difficult.
One of effect of aluminum brazing flux is exactly the oxide-film of removing aluminium and aluminum alloy surface, and the aluminum brazing flux early using is chloride brazing flux, the easy moisture absorption of this brazing flux, and corrosivity is strong, and postwelding needs cleaning.Within 1963, first one piece of Dutch patent documentation has proposed to utilize AlF
3-KF eutectic is as brazing flux.This brazing flux non-corrosiveness, nonhygroscopic, but this brazing flux fusion temperature is higher, and fusion temperature is 558 ℃, is not suitable for middle temperature aluminium alloy brazing.Chinese patent CN102727207A is by changing AlF
3with the ratio of KF, and be reduced to 524-543 ℃ by adding one or both in KCl, LiF and NaF fusion temperature by brazing flux.Although this brazing flux has reduced the fusion temperature of brazing flux to a certain extent, it is only suitable for welding magnesium content lower than 2% aluminium alloy.Patent 101125398A by adding 0.3-1.0%ZnSiF in QF brazing flux
6improved the striping effect of brazing flux to 6063 aluminium alloys, but the fusion temperature of this brazing flux is 560 ℃, is not suitable for the aluminium soldering under medium temperature condition.
For middle temperature aluminium soldering, existing generally acknowledged non-corrosiveness brazing flux is AlF
3-CsF binary brazing flux, wherein AlF
3: CsF=42:58(mol ratio), fusion temperature is 478 ℃.But this brazing flux is still only suitable in fine aluminium and low magnalium, very poor higher than 2% aluminium alloy activity for magnesium content.How to improve at present magnesium content and become a difficult problem higher than the middle temperature brazing of 2% aluminium alloy.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the object of this invention is to provide middle temperature aluminum brazing flux and preparation method that a kind of soldering high-magnesium aluminum alloy is used, be beneficial to solve the problem that solder is not sprawled on higher than 2% aluminium alloy at magnesium content, cannot soldering.
To achieve these goals, the technical solution used in the present invention is to provide the middle temperature aluminum brazing flux that a kind of soldering high-magnesium aluminum alloy is used, wherein: in this, warm aluminum brazing flux constituent comprises AlF
3-CsF-KF ternary system brazing flux matrix and active material ZnCl
2and GeO
2, described AlF
3the mol ratio of-CsF-KF ternary system brazing flux matrix components is AlF
3: CsF:KF=46:51.5:2.5, the AlF that the mass percent of described each part is 93.5%～96.5%
3-CsF-KF, 3～5% ZnCl
2and 0.5～1.5% GeO
2.
The preparation method that the middle temperature aluminum brazing flux that a kind of soldering high-magnesium aluminum alloy uses is provided simultaneously, comprises the following steps:
1) take in proportion the AlF of said components
3, CsF and KF ternary system brazing flux matrix are 300 ℃ in temperature dries 30min;
2) AlF of step 1) being dried
3, CsF and KF ternary system brazing flux matrix puts into the plastics conical flask that fills distilled water, water temperature remains on 85 ℃, heating water bath 15min on hot type magnetic stirring apparatus;
3) by the active element ZnCl of said components
2and GeO
2pour together step 2 into) in solution, fully stir;
4) time pours step 3) solution in crucible into after 15min, at 200 ℃, dries 2 hours, and cooling rear grinding, is the middle temperature aluminum brazing flux that this soldering high-magnesium aluminum alloy is used.Described brazing flux fusing point is 455～480 ℃.
Effect of the present invention is:
1, the fusing point of brazing flux of the present invention is 455～480 ℃, and brazing temperature is 500～525 ℃, can be applicable to middle temperature aluminium soldering;
2, brazing flux of the present invention by adding 3～5%ZnCl in brazing flux matrix
2with 0.5～1.5%GeO
2, greatly improved the activity of brazing flux, under 500 ℃ of conditions, by argon shield, to have realized Zn-Al eutectic solder and at magnesium content, be greater than sprawling on 2% aluminium alloy, its spreading area can reach 3cm
2, far away higher than 0.6～1.0cm of GB/T11364-1989 < < solder spreadability and clearance fillability test method > > standard code
2;
3, brazing flux of the present invention can be used for magnesium content higher than 2% aluminum alloy T type butt welding, its brazed seam surface pore-free and slag inclusion.
The specific embodiment
The middle temperature aluminum brazing flux and the preparation method that soldering high-magnesium aluminum alloy of the present invention are used are illustrated in conjunction with the embodiments.
The middle temperature aluminum brazing flux that soldering high-magnesium aluminum alloy of the present invention is used and preparation method adopt wet synthetic technology to prepare.Design philosophy is: the Al that the matrix of brazing flux can dissolved aluminum alloy surface trace
2o
3the oxide-film of surface compact is broken, at this moment ZnCl
2can be along Al
2o
3after removing, under residual gap, ooze, MgO film peeled off, now fresh Al matrix and the aluminium simple substance in solder all will with GeO
2there is displacement reaction and separate out Ge simple substance, mass transfer reaction occurs, and form Al-Ge Eutectic Layer, promote sprawling of solder.
The middle temperature aluminum brazing flux that soldering high-magnesium aluminum alloy of the present invention is used, in this, warm aluminum brazing flux constituent comprises AlF
3-CsF-KF ternary system brazing flux matrix and active material ZnCl
2and GeO
2, described AlF
3the mol ratio of-CsF-KF ternary system brazing flux matrix components is AlF
3: CsF:KF=46:51.5:2.5, the AlF that the mass percent of described each part is 93.5%～96.5%
3-CsF-KF, 3～5% ZnCl
2and 0.5～1.5% GeO
2.
The preparation method of the middle temperature aluminum brazing flux that soldering high-magnesium aluminum alloy of the present invention is used comprises the following steps:
1) take in proportion the AlF of said components
3, CsF and KF ternary system brazing flux matrix are 300 ℃ in temperature dries 30min;
2) AlF of step 1) being dried
3, CsF and KF ternary system brazing flux matrix puts into the plastics conical flask that fills distilled water, water temperature remains on 85 ℃, heating water bath 15min on hot type magnetic stirring apparatus;
3) by the active element ZnCl of said components
2and GeO
2pour together step 2 into) in solution, fully stir;
4) time pours step 3) solution in crucible into after 15min, at 200 ℃, dries 2 hours, and cooling rear grinding, is the middle temperature aluminum brazing flux that this soldering high-magnesium aluminum alloy is used, and described brazing flux fusing point is 455～480 ℃.
Embodiment 1:
The middle temperature aluminum brazing flux component formula that soldering high-magnesium aluminum alloy of the present invention is used: the mol ratio of brazing flux matrix components is AlF
3: CsF:KF=46:51.5:2.5, active element is ZnCl
2and GeO
2, the AlF that the mass percent of described each part is 93.5%
3-CsF-KF, 5% ZnCl
2and 1.5% GeO
2.Preparation method:
1) take in proportion the AlF of said components
3, CsF and KF ternary system brazing flux matrix are 300 ℃ in temperature dries 30min;
2) AlF of step 1) being dried
3, CsF and KF ternary system brazing flux matrix puts into the plastics conical flask that fills distilled water, water temperature remains on 85 ℃, heating water bath 15min on hot type magnetic stirring apparatus;
3) by the active element ZnCl of said components
2and GeO
2pour together step 2 into) in solution, fully stir;
4) time pours step 3) solution in crucible into after 15min, at 200 ℃, dries 2 hours, and cooling rear grinding, is the middle temperature aluminum brazing flux that is applicable to soldering high-magnesium aluminum alloy.Described brazing flux fusing point is 480 ℃.
Embodiment 2:
The middle temperature aluminum brazing flux component formula that soldering high-magnesium aluminum alloy of the present invention is used: the mol ratio of matrix components is AlF
3: CsF:KF=46:51.5:2.5, active element is ZnCl
2and GeO
2, the AlF that the mass percent of described each part is 96.5%
3-CsF-KF, 3% ZnCl
2and 0.5% GeO
2.
Preparation method: identical with embodiment 1 preparation method, brazing flux fusing point is 455 ℃.
Embodiment 3:
The middle temperature aluminum brazing flux component formula that soldering high-magnesium aluminum alloy of the present invention is used: matrix components mol ratio is AlF
3: CsF:KF=46:51.5:2.5, active element is ZnCl
2and GeO
2, the AlF that the mass percent of described each part is 95%
3-CsF-KF, 4% ZnCl
2and 1% GeO
2.
Preparation method: identical with embodiment 1 preparation method, brazing flux fusing point is 465 ℃.
Claims (2)
1. the middle temperature aluminum brazing flux that soldering high-magnesium aluminum alloy is used, is characterized in that: in this, warm aluminum brazing flux constituent comprises AlF
3-CsF-KF ternary system brazing flux matrix and active material ZnCl
2and GeO
2, described AlF
3the mol ratio of-CsF-KF ternary system brazing flux matrix components is AlF
3: CsF:KF=46:51.5:2.5, the AlF that the mass percent of described each part is 93.5%～96.5%
3-CsF-KF, 3～5% ZnCl
2and 0.5～1.5% GeO
2.
2. a preparation method for the middle temperature aluminum brazing flux that soldering high-magnesium aluminum alloy is used, comprises the following steps:
1) take in proportion the AlF of said components
3, CsF and KF ternary system brazing flux matrix are 300 ℃ in temperature dries 30min;
2) AlF of step 1) being dried
3, CsF and KF ternary system brazing flux matrix puts into the plastics conical flask that fills distilled water, water temperature remains on 85 ℃, heating water bath 15min on hot type magnetic stirring apparatus;
3) by the active element ZnCl of said components
2and GeO
2pour together step 2 into) in solution, fully stir;
4) time pours step 3) solution in crucible into after 15min, at 200 ℃, dries 2 hours, and cooling rear grinding, is the middle temperature aluminum brazing flux that this soldering high-magnesium aluminum alloy is used, and described brazing flux fusing point is 455～480 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310512119.2A CN103612029A (en) | 2013-10-25 | 2013-10-25 | Intermediate-temperature aluminum brazing flux for brazing of high-magnesium aluminum alloy and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310512119.2A CN103612029A (en) | 2013-10-25 | 2013-10-25 | Intermediate-temperature aluminum brazing flux for brazing of high-magnesium aluminum alloy and preparation method |
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| Publication Number | Publication Date |
|---|---|
| CN103612029A true CN103612029A (en) | 2014-03-05 |
Family
ID=50162763
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|---|---|---|---|
| CN201310512119.2A Pending CN103612029A (en) | 2013-10-25 | 2013-10-25 | Intermediate-temperature aluminum brazing flux for brazing of high-magnesium aluminum alloy and preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499827A (en) * | 2016-02-01 | 2016-04-20 | 天津大学 | Low-melting-point intermediate-temperate aluminum brazing flux for brazing aluminum and aluminum alloy, and preparation method of low-melting-point intermediate-temperate aluminum brazing flux |
| CN106001999A (en) * | 2016-06-14 | 2016-10-12 | 江苏阳明船舶装备制造技术有限公司 | Soldering flux used for soldering of rare earth magnesium alloy and preparation method |
| CN106041368A (en) * | 2016-06-14 | 2016-10-26 | 江苏阳明船舶装备制造技术有限公司 | Brazing flux for brazing rare earth magnesium alloy and preparation method |
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| CN102423834A (en) * | 2011-09-30 | 2012-04-25 | 河海大学常州校区 | Highly-active soldering flux suitable for stepped brazing of magnesium-aluminum alloy and preparation method of highly-active soldering flux |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499827A (en) * | 2016-02-01 | 2016-04-20 | 天津大学 | Low-melting-point intermediate-temperate aluminum brazing flux for brazing aluminum and aluminum alloy, and preparation method of low-melting-point intermediate-temperate aluminum brazing flux |
| CN106001999A (en) * | 2016-06-14 | 2016-10-12 | 江苏阳明船舶装备制造技术有限公司 | Soldering flux used for soldering of rare earth magnesium alloy and preparation method |
| CN106041368A (en) * | 2016-06-14 | 2016-10-26 | 江苏阳明船舶装备制造技术有限公司 | Brazing flux for brazing rare earth magnesium alloy and preparation method |
| CN106041368B (en) * | 2016-06-14 | 2018-06-15 | 江苏阳明船舶装备制造技术有限公司 | A kind of brazing flux and preparation method for being brazed magnesium-rare earth |
| CN106001999B (en) * | 2016-06-14 | 2018-06-15 | 江苏阳明船舶装备制造技术有限公司 | A kind of brazing flux and preparation method for being used to be brazed magnesium-rare earth |
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