CN102218625A - Bromide soldering flux for copper-aluminum soldering - Google Patents
Bromide soldering flux for copper-aluminum soldering Download PDFInfo
- Publication number
- CN102218625A CN102218625A CN201110129409XA CN201110129409A CN102218625A CN 102218625 A CN102218625 A CN 102218625A CN 201110129409X A CN201110129409X A CN 201110129409XA CN 201110129409 A CN201110129409 A CN 201110129409A CN 102218625 A CN102218625 A CN 102218625A
- Authority
- CN
- China
- Prior art keywords
- soldering
- bromide
- copper
- soldering flux
- brazing flux
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a bromide soldering flux for copper-aluminum soldering. The bromide soldering flux comprises a substrate, a solvent and a film removal agent; according to weight percentage, zinc bromide (ZnBr2) serving as the substrate accounts for about 24 to 25 percent, ammonium bromide (NH4Br) serving as the solvent accounts for about 74 to 75 percent, and sodium fluoride serving as the film removal agent accounts for about 1 to 2 percent. The prepared bromide soldering flux has the characteristics of fast consumption in a soldering process and low postwelding residue, and can avoid corrosion of a copper-aluminum joint caused by the residual soldering flux after welding. Moreover, the service life of the copper-aluminum soldering joint prepared from stannum, zinc and copper soldering flux reaches more than 14 years, and the bromide soldering flux is applicable for the environment of an air conditioner refrigeration pipeline.
Description
Technical field
The present invention relates to a kind of brazing flux that is used for the copper aluminium soldering, relate in particular to a kind of copper aluminium soldering bromide brazing flux.
Technical background
Along with the in short supply of copper resource highlights day by day, its price raises year by year, and the copper calorize of refrigeration pipe seems particularly urgent.And existing copper and aluminium welding connects process such as stored energy welding, friction welding (FW), electric resistance welding, explosive welding (EW), can not satisfy the requirement of welding space and online production; And Lip river gram ring can not satisfy the requirement of cost and compactness aspect.Therefore, from aspect analysis-by-synthesis such as cost, compactness, execute-in-places, method for welding is best suited for the copper-aluminium method of attachment of refrigeration pipe welding.
Soldering between the different materials has different specification requirements.Existing solder and brazing flux are to exist variety of issue to cause it can't satisfy the need of work of refrigeration pipe carrying out the copper aluminium soldering.After the part copper aluminium soldering was finished, strength of joint did not reach requirement, placed pipe-line system very easily to break, and can't satisfy instructions for use; A part of in addition copper and aluminium welding connects method, and the remaining brazing flux corrosivity of postwelding then to have occurred strong, causes soldered fitting in use to corrode, thereby cause not reaching service life requirement.
When metal exposed was in the middle of air, chemical reaction can appear.The speed of this reaction is accelerated along with the rising of temperature in general.Chemical reaction can generate oxide.The formation speed of oxide changes along with the state of metal components and oxygen.The toughness of oxide, structure, thickness, the difficulty of cleaning or can further oxidation not be to need the factor considered.In air,, under room temperature even lower temperature, almost take place in moment as the oxidation of this metalloid of aluminium.Oxide on surface or other compounds have hindered the formation of soldered fitting.
Because aluminium is amphoteric metal, it and strong base solution reaction generate aluminate, again with acid reaction generation aluminium salt, add entry after these two kinds of reactions all can produce hydrogen, these two kinds of reactions are that we should avoid as far as possible, so the less moisture of sneaking into of should trying one's best in brazing flux.
The effect of soldering brazing flux be in brazing process, be used for dissolving, remove the mother metal oxide on surface, solder oxide on surface and other do not need surface mass, and the protection above-mentioned material generates a kind of welding material of new surface mass in brazing process.Its objective is by preventing mother metal and solder oxidation, reduce surface tension and promote solder to flow, promote the formation of soldered fitting.Brazing flux also must flow, and the braze metal that its position easily is melted replaces.The field of activity of soldering brazing flux must comprise the metal molten scope of supporting with it use solder.When being used for refrigeration pipe, brazing flux also has following the requirement: the oxide of aluminum tube surfaces is wanted and can be regenerated after the soldering; To be strictly on guard against in the brazing process and enter chlorion in the pipe-line system; Can not corrode pipe-line system and reduce product service life.The composition of brazing flux must be controlled.
Traditional brazing flux zinc chloride mainly on probation and ammonium chloride cooperate stripper, but owing to contain a large amount of chlorions in the brazing flux, can't guarantee that it does not enter in the refrigeration pipe.Therefore, in the process of the new brazing flux of configuration, need to adopt appropriate ingredients product as an alternative.
Summary of the invention
The purpose of this invention is to provide a kind of bromide brazing flux that is used for the copper aluminium soldering.This brazing flux fusing point and minimum activation temperature be about about in the of 300 ℃, and in welding process the effectively oxide skin on stripping metal copper, aluminium surface, especially aluminium surface compact oxide skin, promote capillarity to carry out.When using this brazing flux to carry out the soldering of copper and aluminium, have the soldering effect stability, and the postwelding little residue, do not have characteristics such as corrosion, can guarantee that situations such as accelerated corrosion do not appear in albronze after preparation; Because product is used for refrigeration system pipeline, require to avoid chlorion to enter into soldering copper pipe inside.
For achieving the above object, the present invention has taked following technical scheme:
Copper aluminium soldering bromide brazing flux of the present invention is mixed by matrix, solvent, stripper.Wherein, percentage calculates by weight, as the zinc bromide (ZnBr of matrix
2) account for 24%-25%, account for (NH as the ammonium bromide of solvent
4Br) 74%--75% accounts for 1%-2% as the sodium fluoride (NaF) of stripper.
In the brazing flux, mainly provide heat endurance, guarantee that brazing flux only just has corresponding activity in welding process under the temperature of determining as the zinc bromide of matrix.Zinc bromide is a kind of strong water absorbent, shows acid, and the suction back is bigger to the quality influence of brazing flux, occurs because have several ions in the brazing flux behind the water leaking-in, or exists simultaneously.As: Zn
+ 2, Br
-, H
+, OH
-Then above-mentioned reaction can appear.H is arranged
2Bubble is emerged.H
+, Br
-Then can produce Zn (OH) after having reacted
2And Al (OH)
3Mixture etc. multiple material.
Play the ammonium bromide of solvent action, can work to regulate the brazing flux temperature again.
Sodium fluoride plays the rupture of membranes effect in this brazing flux, because aluminium oxide on surface (Al
2O
3) hard, fine and close, acid and alkali-resistance, destroy this tunic can only be with the mode of mechanical stripping, thereby to have selected for use the strongest fluorine of nonmetal characteristic, fluorine to be that No. nine element outer-shell electron arrange be 2s
22p
5, can produce very strong hydrogen bond, its atomic volume also is minimum except that protium in nonmetal.So can penetrate fine and close Al
2O
3Oxide layer.And it is peeled off.But the fusion temperature of sodium fluoride higher (995 ℃) so can have a strong impact on brazing temperature after adding sodium fluoride in the brazing flux, should add as far as possible less.
During the brazing flux practical application, main reaction also produces AlBr when generating Zn
3, the fusing point of this material has only 190 ℃, but 180 ℃ of just distillations, is white crystal at normal temperatures, with water violent decomposition reaction takes place, and runs into the also strong cigarette that turns white of micro-moisture in air.Be not easy to remain on the workpiece, this also is the reason that the welding point residue is wiped clean easily.
The present invention is used for the copper aluminium soldering, and its innovative point is that aluminium soldering designs at copper.Compare with prior art, it is fast that the bromide brazing flux that uses the present invention's configuration to form has brazing process consumption, and the characteristics of postwelding little residue can be avoided after welding because the corrosion of the copper-aluminium joint that brazing flux remnants cause.Reached more than 14 years the service life that cooperates tin zinc-copper solder to finish the copper aluminium soldering joint of preparation, increased substantially tin zinc-copper solder and carried out the qualification rate that copper and aluminium welding connects, be applicable to air conditioner refrigerating pipeline environment.
Concrete form of implementation
The present invention is further illustrated below by embodiment:
Copper aluminium soldering bromide brazing flux of the present invention is mixed by matrix, solvent, stripper.Wherein, percentage calculates by weight, as the zinc bromide (ZnBr of matrix
2) account for 24%-25%, account for (NH as the ammonium bromide of solvent
4Br) 74%--75% accounts for 1%-2% as the sodium fluoride (NaF) of stripper.
Embodiment 1
2.4 kilograms zinc bromides are added in the enamel still of band agitating devices, add again 7.4 kilograms ammonium bromide, 0.2 kilogram sodium fluoride after the three thoroughly stirs, uses 200 purpose stainless (steel) wires to filter and removes impurity, can obtain the brazing flux mixture.Pack into and store in the airtight Plastic Drum.
Embodiment 2
With 2.5 kilograms zinc bromides, 7.4 kilograms ammonium bromide, 0.1 kilogram sodium fluoride, the three put into the planetary gear blender thoroughly mix the back packing.Pack into and store in the airtight Plastic Drum.
Embodiment 3
2.4 kilograms zinc bromides are added in the enamel still of band agitating devices, add again 7.5 kilograms ammonium bromide, 0.1 kilogram sodium fluoride after the three thoroughly stirs, uses 200 purpose stainless (steel) wires to filter and removes impurity, can obtain the brazing flux mixture.Pack into and store in the airtight Plastic Drum.
Embodiment 4
With 2.45 kilograms zinc bromides, 7.45 kilograms ammonium bromide, 0.1 kilogram sodium fluoride, the three put into the planetary gear blender thoroughly mix the back packing.Pack into and store in the airtight Plastic Drum.
After tested, the brazing flux that aforesaid way is made cooperates tin zinc-copper solder that the Cu-Al dissimilar metal tube is carried out soldering, has the splendid pricker effect that helps, and postwelding does not have corrosion, satisfies the requirement of copper aluminium soldering.Use the strong brazing flux of corrosivity to remove the oxide-film of aluminium during the direct brazing filler metal of traditional copper aluminium, form electrolyte after the brazing flux residue moisture absorption, will constitute strong corrosive agent, thereby corrosion copper aluminium soldering joint makes it rapid inefficacy, no practical value (as being used for air-conditioning duct etc.).This brazing flux then generates aluminium bromide in use, the fusing point of this material has only 190 ℃, but 180 ℃ of just distillations, be white crystal at normal temperatures, with water violent decomposition reaction taking place is not easy to remain on the workpiece, the welding point residue is wiped clean easily, thereby has avoided the corrosion of brazing flux remnants to copper-aluminium joint.
Claims (1)
1. bromide brazing flux that is used for the copper aluminium soldering, comprise matrix, solvent, stripper, it is characterized in that: each component is calculated according to percetage by weight, and the matrix zinc bromide accounts for 24%-25%, the solvent ammonium bromide accounts for 74%--75%, accounts for 1%--2% as the sodium fluoride of stripper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110129409XA CN102218625A (en) | 2011-05-18 | 2011-05-18 | Bromide soldering flux for copper-aluminum soldering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110129409XA CN102218625A (en) | 2011-05-18 | 2011-05-18 | Bromide soldering flux for copper-aluminum soldering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102218625A true CN102218625A (en) | 2011-10-19 |
Family
ID=44775464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110129409XA Pending CN102218625A (en) | 2011-05-18 | 2011-05-18 | Bromide soldering flux for copper-aluminum soldering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102218625A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600180A (en) * | 2013-11-14 | 2014-02-26 | 北京航空航天大学 | Surface stripping agent capable of realizing aluminum-magnesium alloy flawless direct-current positive polarity welding |
| CN103769776A (en) * | 2014-01-14 | 2014-05-07 | 浙江新锐焊接材料有限公司 | Fluoride brazing flux for copper-aluminum dissimilar metal and preparation method for fluoride brazing flux |
-
2011
- 2011-05-18 CN CN201110129409XA patent/CN102218625A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103600180A (en) * | 2013-11-14 | 2014-02-26 | 北京航空航天大学 | Surface stripping agent capable of realizing aluminum-magnesium alloy flawless direct-current positive polarity welding |
| CN103769776A (en) * | 2014-01-14 | 2014-05-07 | 浙江新锐焊接材料有限公司 | Fluoride brazing flux for copper-aluminum dissimilar metal and preparation method for fluoride brazing flux |
| CN103769776B (en) * | 2014-01-14 | 2016-06-29 | 浙江新锐焊接材料有限公司 | A kind of copper aluminum dissimilar metal fluoride flux and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101204762B (en) | Al and Al alloy soft braze welding metal displaced type unleaded welding soldering flux | |
| CN102139425B (en) | High-reliability soldering flux for aluminum soft soldering | |
| TWI537087B (en) | Flux forming an insoluble brazing residue | |
| CN101407003B (en) | Formula of flux for middle temperature brazing magnesium-containing aluminum alloy | |
| JP4807638B2 (en) | Liquid flux, manufacturing method and manufacturing apparatus thereof | |
| NO340339B1 (en) | Ribbon or foil of aluminum core alloy, as well as soldered part when used | |
| KR20110102363A (en) | Anticorrosive flux | |
| CN104708232B (en) | Composite brazing flux suitable for copper and aluminum dissimilar metal brazing | |
| PL193962B1 (en) | Flux for brazing difficult to wet metallic materials by molten brazing solder and method of obtaining such flux | |
| CN104364046A (en) | Flux composition, liquid flux, resin flux cored solder, and solder paste | |
| WO2006025224A1 (en) | Flux for soldering | |
| JPS61169162A (en) | Brazing method of aluminum material | |
| CN102218625A (en) | Bromide soldering flux for copper-aluminum soldering | |
| CN108326475B (en) | Preparation method of coating silver brazing ring | |
| CN103648710B (en) | The soldering flux of aluminum based material | |
| CN103429378A (en) | Flux | |
| CN105618960B (en) | Suitable for the brazing flux of aluminum steel soldering | |
| CN105618961B (en) | A kind of caesium rubidium brazing flux containing zinc fluoroborate | |
| JP2015166101A (en) | Joining method of aluminum material, joining body of aluminum material | |
| US4647308A (en) | Soldering compositions, fluxes and methods of use | |
| CN105414801A (en) | Preparation method for aluminum foil welding solder organic flux | |
| CN104708233B (en) | One is applicable to copper aluminum soft soldering cleaning-free scaling powder and preparation method thereof | |
| EP2321449B1 (en) | Method for removing brazing residues from aluminum articles | |
| WO2022004174A1 (en) | Heat storage device | |
| JP2009297782A (en) | Method and device for producing liquid flux |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111019 |