JPS61195798A - Flux composition for brazing - Google Patents
Flux composition for brazingInfo
- Publication number
- JPS61195798A JPS61195798A JP3532885A JP3532885A JPS61195798A JP S61195798 A JPS61195798 A JP S61195798A JP 3532885 A JP3532885 A JP 3532885A JP 3532885 A JP3532885 A JP 3532885A JP S61195798 A JPS61195798 A JP S61195798A
- Authority
- JP
- Japan
- Prior art keywords
- flux
- brazing
- suspension
- alf3
- furnace
- 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
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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えばアルミニウム又はアルミニウム合金の
部材をこれらより低融点のアルミニウム合金ろうを用い
てろう付する場合に用いられるろう付用フラツクス組成
物に関するものである。Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a brazing flux composition used when, for example, aluminum or aluminum alloy members are brazed using an aluminum alloy solder having a lower melting point than these members. It is related to.
アルミニウム又はアルミニウム合金(以下単にアルミニ
ウム)材は、軽量で熱伝導性が良い等の特長を有してお
シ、各種の自動車部品及びラジェーター、コンデンサー
、エバポレーター等の自動車用熱交換器に利用されてい
る。Aluminum or aluminum alloy (hereinafter simply referred to as aluminum) has features such as being lightweight and having good thermal conductivity, and is used in various automobile parts and automobile heat exchangers such as radiators, condensers, and evaporators. There is.
そして、例えば熱交換器の大部分は多くの微小な個所を
接合する必要から主としてろう付によって組み立てられ
ており、このろう付手段としては例えば真空ろう付、不
活性ガス雰囲気ろう付、あるいはフラックスを用いての
炉中ろう付等がある。For example, most heat exchangers are assembled mainly by brazing because it is necessary to join many minute parts, and the brazing methods include vacuum brazing, inert gas atmosphere brazing, or flux. Furnace brazing, etc.
これらのろう付手段のうち真空ろう付は、フラックスを
使用しないので残留フラックスを除去する工程が省略さ
れるといったメリットがあるものの、装置が高価なこと
、及び完成品の腐食防止の為に貼り合わされている犠牲
陽極材(0,5〜2重量%のZnを添加したアルミニウ
ム合金材)の中のZnの多くが蒸発して失われることか
ら耐食性が不充分となり、他のコスト高な腐食防止手段
に頼らざるを得ないといった欠点がある。Among these brazing methods, vacuum brazing has the advantage of omitting the process of removing residual flux because it does not use flux, but the equipment is expensive and it is difficult to bond the finished product to prevent corrosion. Much of the Zn in the sacrificial anode material (aluminum alloy material with 0.5 to 2% Zn added) is lost by evaporation, resulting in insufficient corrosion resistance and requiring other costly corrosion prevention measures. There are drawbacks such as having to rely on
又、不活性ガス雰囲気ろう付は、上記の場合のよりなZ
nの蒸発といったことがないものの、ろう付置前にアル
ミニウム材の表面酸化皮膜を除去する為のアルカリ洗浄
が必要であったり、用いる不活性ガスが一60℃以下の
低露点のものであることが要求されたりすること等工程
が煩雑でコスト高な欠点がある。In addition, inert gas atmosphere brazing is more
Although there is no evaporation of n, it is necessary to perform alkaline cleaning to remove the surface oxide film of the aluminum material before brazing, and the inert gas used has a low dew point of 160°C or less. The drawback is that the process is complicated and the cost is high.
又、フラックスを用いての炉中ろう付の場合は、Znの
蒸発といった問題がなく、かつ隙間充填性を考慮したろ
う付性に優れているものの、完成品の腐食を促進する残
留フラックスの除去が困難であり、この為コスト高なも
のとなる欠点がある0〔発明の開示〕
本発明者は、犠牲陽極材中のZnの蒸発といった問題が
なく、かつろう付性に優れているものの、ろう付後にお
ける残留フラックスの点で問題がちるとされているフラ
ックスを用いての炉中ろう封手段についての研究を進め
ているうちに、フラックスの組成分としてに2SiF、
とAlF3とを用いたものは、残留フラックスの問題が
極めて少ない、つまりろう付後の残留フラックスの除去
が容易であり、かつ残留フラックスによる腐食等の問題
が著しく少ないものとなることを見い出した。In addition, in the case of furnace brazing using flux, there is no problem such as evaporation of Zn and the brazing performance is excellent considering gap filling properties, but it is difficult to remove the residual flux that promotes corrosion of the finished product. [Disclosure of the Invention] The present inventor has found that although there is no problem such as evaporation of Zn in the sacrificial anode material and it has excellent brazing properties, While conducting research on furnace brazing means using flux, which is said to have a problem with residual flux after brazing, we discovered that 2SiF, 2SiF,
It has been found that the problem of residual flux is extremely small in the case of using aluminum and AlF3, that is, the residual flux can be easily removed after brazing, and problems such as corrosion caused by the residual flux are significantly reduced.
すなわち、 K2S1F、lとAlF3とを組成分とす
るフラックスを用いてろう付が行なわれた場合には、完
成品の種々の表面処理を行なう上で障害となる残留フラ
ックスの除去が容易であり、しかもフラックスが除去し
きれずに残留していてもこの残留フラックスの悪影響は
著しく少ないことを見い出したのである。That is, when brazing is performed using a flux containing K2S1F,1 and AlF3 as components, it is easy to remove the residual flux that becomes an obstacle when performing various surface treatments on the finished product. Furthermore, it has been found that even if the flux is not completely removed and remains, the negative effects of this residual flux are extremely small.
このようにに2SiF、とAlF3とが用いられると優
れた効果を発揮するのは、次のような理由によるものと
推察される。すなわち、ろう付過程において、K2Si
F6は一部解離し、Siがアルミニウム材表面に析出す
る為ろうの隙間充填性を補う効果があり、又、Siの還
元反応を通じてろうの広が9を促進し、ろう付性を向上
させ、又、残留したフラックスの主たる成分はKAIF
、とKsA#F6となっていて、これらの組成物は非吸
質性でアルミニウム材の腐食を促進させる因子ではない
からと考えられる。The reason why 2SiF and AlF3 exhibit excellent effects when used in this way is presumed to be due to the following reasons. That is, in the brazing process, K2Si
F6 partially dissociates and Si precipitates on the surface of the aluminum material, which has the effect of supplementing the gap-filling properties of the solder. Also, through the reduction reaction of Si, it promotes the spread of the solder9 and improves the brazing properties. Also, the main component of the remaining flux is KAIF.
, and KsA#F6, which is thought to be because these compositions are non-absorbent and are not a factor that promotes corrosion of aluminum materials.
同、K2S1F、とAlF3との割合は、K2S1F、
が約56〜63wt%、AlF3が約44〜37wt%
である場合に、その効果が著しく顕著である。これは、
前記の割合から大巾にずれた組成の場合には、フラック
スの融点が上昇し、アルミニウム材のろう付性向上に寄
与する度合が低下する傾向があるからと考えられる。The ratio of K2S1F and AlF3 is K2S1F,
is approximately 56 to 63 wt%, and AlF3 is approximately 44 to 37 wt%.
The effect is particularly pronounced when . this is,
This is believed to be because, in the case of a composition that deviates significantly from the above ratio, the melting point of the flux increases, and the extent to which it contributes to improving the brazability of aluminum materials tends to decrease.
又、本発明のフラックスには、K2S県とA7F3以外
のものが本発明の効果を阻害しない程度であれば含まれ
ていてもよく、例えばアルカリ金属、アルカリ土類金属
、 Znのフッ化物をはじめとする不純物等が約5wt
%以内程度含まれていても、フラックスの融点が用いら
れるアルミニウム合金ろう材の融点より高くはならず、
本発明の効果が減少することはほとんどない。Furthermore, the flux of the present invention may contain substances other than K2S and A7F3 as long as they do not impede the effects of the present invention, such as alkali metals, alkaline earth metals, Zn fluorides, etc. Approximately 5wt of impurities, etc.
Even if the flux is contained within %, the melting point of the flux will not be higher than the melting point of the aluminum alloy brazing filler metal used,
The effectiveness of the invention is hardly diminished.
そして、本発明のフラックスは、例えば56〜63Wt
チのに2SiFと44〜37wt%のAIF’3との混
合物を約200メツシユ以下の大きさの粒に粉砕し、こ
の微粉末を約5〜20チの濃度となるよう例えば水と混
合して懸濁液を作製し、そしてこの懸濁液を浸漬、塗布
あるいは吹付手段等適宜な手段でアルミニウム材表面に
付着させ、そして約50〜200℃の大気炉中で充分に
乾燥して水分を除去した彼、露点を一15℃以下に調整
したAr又はN2等の不活性ガス雰囲気の炉中でろう付
作業がなされることによってろう付が行なわれる。The flux of the present invention is, for example, 56 to 63 Wt.
A mixture of 2SiF and 44 to 37 wt% AIF'3 is ground into particles with a size of about 200 mesh or less, and this fine powder is mixed with water, for example, to a concentration of about 5 to 20 mesh. A suspension is prepared, and this suspension is applied to the surface of the aluminum material by dipping, coating, or spraying, and then thoroughly dried in an atmospheric oven at approximately 50 to 200°C to remove moisture. Then, brazing is performed by performing the brazing operation in a furnace in an atmosphere of an inert gas such as Ar or N2 whose dew point is adjusted to below -15°C.
K2SiF6約56〜63重量部とAlF3約44〜3
7重量部とを混合し、そしてこの混合物を約200メツ
シユ以下の粒度のものに粉砕する。About 56-63 parts by weight of K2SiF6 and about 44-3 parts by weight of AlF3
7 parts by weight, and the mixture is ground to a particle size of about 200 mesh or less.
そして、上記200メツシュ以下O粒度に粉砕されたに
2SiF6−AlF3粉を、濃度が約5〜20%のもの
となるよう水に懸濁して懸濁液を作る。Then, the 2SiF6-AlF3 powder pulverized to a particle size of 200 mesh or less is suspended in water to a concentration of about 5 to 20% to form a suspension.
次に、例えばJIS−H4000に規定されているA3
003を心材、′及びJIS−Z3263に規定されて
いるBA4045をろう材としたプレージングシートと
同様のA3003の板を丁字形に組み合わせて、このフ
ラックス懸濁液を塗布する。同、この塗布に先立って、
懸濁液が上記の丁字形に組み合わせた試験体の表面に均
一に分布するように予め試験体を脱脂液で洗浄する。Next, for example, A3 specified in JIS-H4000.
This flux suspension is applied to plates of A3003 similar to the plating sheet in which 003 is used as the core material and BA4045 specified in JIS-Z3263 is used as the brazing material. Same, prior to this application,
The test specimen is preliminarily washed with a degreasing solution so that the suspension is uniformly distributed over the surface of the test specimen assembled in the T-shape.
そして、このフラックス懸濁液を塗布した試験体を約1
50℃の大気炉中で乾燥した後、所定のろう付(ろう付
温度600°Cの不活性ガス雰囲気中で5分間保持)を
行なう。Then, the test piece coated with this flux suspension was
After drying in an atmospheric oven at 50°C, predetermined brazing (brazing temperature 600°C, held in an inert gas atmosphere for 5 minutes) is performed.
実施例 において用いたに2SiF −A7F3の系よ
りなるフラックスの代りにKF−AIFn系よりなるフ
ラックスを用いて同様にしてろう付作業を行なう〇〔特
性〕
上記実施例及び比較例で得た製品のろう付性及び残留フ
ラックスについて調べると、表に示す通りである。Brazing work was performed in the same manner using a flux made of KF-AIFn system instead of the flux made of 2SiF-A7F3 system used in the example. [Characteristics] The products obtained in the above examples and comparative examples. The results of the brazing properties and residual flux are shown in the table.
表
・ろう付性テストの評価は、充分大きなフィレットが途
切れなく形成されている場合を○印で、一部にろうのま
わりが悪くろう切れが見られる場合をΔ印で、はとんど
フィレットの形成されていない場合をX印で表わした。The evaluation of the brazeability test is as follows: ○ indicates that a sufficiently large fillet is formed without interruption, and Δ indicates that the solder is not well-circumscribed in some areas and breaks in the solder. The case where no formation was made is indicated by an X mark.
・比較例におけるフラックス懸濁液はエチルアルコール
を用いて構成。- The flux suspension in the comparative example was composed of ethyl alcohol.
・比較例におけるフラックス組成の欄で示されている會
印のフラックス組成はに2SiF6ではな(KFである
。- The flux composition shown in the flux composition column in the comparative example is not 2SiF6 (KF).
この表かられかるように、KF−A7F3系のフラック
スに比べてに2SiF6−AlFJのフラックスが用い
られた場合には、そのろう付性が一段と良く、又残留フ
ラックスは少量であって、しかもこの残留フラックスの
除去は極めて容易である。As can be seen from this table, when 2SiF6-AlFJ flux is used compared to KF-A7F3-based flux, its brazing properties are much better, and the residual flux is small. Removal of residual flux is extremely easy.
Claims (1)
るろう付用フラツクス組成物。A brazing flux composition comprising K_2SiF_6 and AlF_3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3532885A JPS61195798A (en) | 1985-02-26 | 1985-02-26 | Flux composition for brazing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3532885A JPS61195798A (en) | 1985-02-26 | 1985-02-26 | Flux composition for brazing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61195798A true JPS61195798A (en) | 1986-08-30 |
Family
ID=12438754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3532885A Pending JPS61195798A (en) | 1985-02-26 | 1985-02-26 | Flux composition for brazing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61195798A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01202396A (en) * | 1988-02-09 | 1989-08-15 | Calsonic Corp | Flux for brazing aluminum and its coating method |
-
1985
- 1985-02-26 JP JP3532885A patent/JPS61195798A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01202396A (en) * | 1988-02-09 | 1989-08-15 | Calsonic Corp | Flux for brazing aluminum and its coating method |
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