JPH01133671A - Manufacture of tubular material for heat exchanger - Google Patents
Manufacture of tubular material for heat exchangerInfo
- Publication number
- JPH01133671A JPH01133671A JP29321987A JP29321987A JPH01133671A JP H01133671 A JPH01133671 A JP H01133671A JP 29321987 A JP29321987 A JP 29321987A JP 29321987 A JP29321987 A JP 29321987A JP H01133671 A JPH01133671 A JP H01133671A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- thermal spraying
- layer
- evaporation
- heat exchanger
- 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
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- 229910000882 Ca alloy Inorganic materials 0.000 claims abstract description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 17
- 238000005219 brazing Methods 0.000 abstract description 16
- 239000010410 layer Substances 0.000 abstract description 15
- 238000007751 thermal spraying Methods 0.000 abstract description 15
- 230000008020 evaporation Effects 0.000 abstract description 9
- 238000001704 evaporation Methods 0.000 abstract description 9
- 239000002245 particle Substances 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 3
- 239000002344 surface layer Substances 0.000 abstract description 3
- 229910007570 Zn-Al Inorganic materials 0.000 abstract 2
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000009792 diffusion process Methods 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000000304 warm extrusion Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動車の熱交換器用管材の製造方法に関するも
ので、特に真空ろう付時におけるＺｎの蒸発を抑制し、
熱交換器の耐食性を改善するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a tube material for an automobile heat exchanger, and in particular suppresses evaporation of Zn during vacuum brazing,
This improves the corrosion resistance of heat exchangers.
自動車のエアコン用熱交換器、即ちコンデンサー及びエ
バポレーターはほとんどアルミニウム材で造られている
。これ等の形状は第３図に示すようにサーペンタインタ
イプが多く、熱間又は温間で管状に押出成形した管材（
１）を曲げ部（４）で折り曲げて蛇行状とし、この管材
（１）。Heat exchangers for automobile air conditioners, namely condensers and evaporators, are mostly made of aluminum. As shown in Figure 3, most of these shapes are serpentine types, which are tube materials made by hot or warm extrusion into a tube shape (
1) is bent at the bending part (4) to form a meandering shape.
（１）間にプレージングシートからなるコルゲートフィ
ン（２）を接合し、折り曲げた管材（１）の端部にコネ
クターを取付けて構成されており、種々のろう付工法に
より製造されている。It is constructed by joining a corrugated fin (2) made of plating sheet between (1) and attaching a connector to the end of a bent pipe (1), and is manufactured by various brazing methods.
アルミニウム材はその性質として高温多湿下で孔食形態
の腐食を生じることがあげられるが、熱交換器の管材に
ついては、その内面は有機媒体に接しているので腐食問
題は起きないものの、外面は高温多湿の条件にざらされ
た場合に孔食が発生し、管材の内面に達する貫通による
事故につながる重大な問題となることがある。Aluminum materials are prone to corrosion in the form of pitting under high temperature and high humidity conditions, but the inner surface of heat exchanger tubes is in contact with the organic medium, so corrosion does not occur, but the outer surface does. Pitting corrosion occurs when exposed to hot and humid conditions and can be a serious problem that can lead to accidents due to penetration reaching the inner surface of the pipe.
この外面よりの孔食対策として、各ろう付工法により、
それぞれ異なった方法で対処している。真空ろう付法（
ＶＢ法）では管材に対して電位が卑なＺｎ又は３ｎ等を
添加したプレージングシートのフィンを用い、このフィ
ンが犠牲腐食して管材を保護する方法をとっている。し
かしこの方法では管材の曲げ部はフィンから遠いため犠
牲効果が働かず、腐食環境のきびしい所では使用できな
い。As a countermeasure against pitting corrosion from the outside surface, various brazing methods are used to
Each is dealt with differently. Vacuum brazing method (
In the VB method), fins of a plating sheet doped with Zn or 3n, etc., which have a less common potential, are used for the tube material, and the fins are sacrificially corroded to protect the tube material. However, in this method, the bent portion of the tube material is far from the fins, so the sacrificial effect does not work, and it cannot be used in places with severe corrosive environments.
［発明が解決しようとする問題点］
真空ろう付により製造される熱交換器の耐食性、特に曲
げ部の耐食性を改善する方法としては、管材表面にＺｎ
の拡散層を設けることが好ましい。この層は管材の電位
に対して卑であり、電気化学的に犠牲層として働き、Ｚ
ｎの未拡散の部分を保護し、貫通孔食を防ぐものである
。[Problems to be Solved by the Invention] As a method for improving the corrosion resistance of heat exchangers manufactured by vacuum brazing, especially the corrosion resistance of bent parts, Zn is added to the surface of the tube material.
It is preferable to provide a diffusion layer of. This layer is base to the potential of the tube material, acts as an electrochemical sacrificial layer, and Z
This protects the undiffused portion of n and prevents through-pitting corrosion.
Ｚｒｌ拡散層は最大７０８度０．５〜５％、Ｚｎ拡散深
さ１００〜２００μｍの範囲が良く、そのためにろう付
に先立ち予めＺｎを５〜２０９７ｒｄ被覆しておき、ろ
う付の加熱によりＺｎを管材表面に拡散させる。Ｚｎを
被覆する方法としては、ジンケート法や溶射法等種々の
方法が提案されている。The Zrl diffusion layer should preferably have a maximum temperature of 708 degrees, 0.5 to 5%, and a Zn diffusion depth of 100 to 200 μm. Therefore, prior to brazing, the Zrl diffusion layer should be coated with 5 to 2097 rd of Zn, and the Zn would be coated with Zn by heating during brazing. Diffuse it on the surface of the pipe material. Various methods have been proposed for coating with Zn, such as a zincate method and a thermal spraying method.
しかしながらＺｎを被覆し管材を真空ろう付すると、ｌ
ｎの蒸気圧が高いため、はとんどのＺｎが蒸発してしま
い、管材へのＺｎ拡散が不十分となり、耐食性を改善す
ることはできない。However, if the tube is coated with Zn and vacuum brazed, l
Since the vapor pressure of n is high, most of the Zn evaporates, resulting in insufficient Zn diffusion into the pipe material, making it impossible to improve corrosion resistance.
本発明はこれに鑑み種々検討の結果、真空ろう付におい
て、Ｚｎの蒸発を抑制し、従来よりも耐食性が改善され
た熱交換器用管材の製造方法を開発したものでおる。In view of this, as a result of various studies, the present invention has developed a method for manufacturing heat exchanger tube materials that suppresses evaporation of Zn during vacuum brazing and has improved corrosion resistance compared to conventional methods.
即ち本発明製造法は、Ａｌ又はＡｌ合金の押出管材の表
面に、Ｚｎ、！＝Ａｊ！又はＡ、ｆ！−Ｃａ合金を同時
にアーク溶射により溶射することを特徴とするものであ
る。That is, the manufacturing method of the present invention applies Zn,!, to the surface of an extruded aluminum or aluminum alloy tube material. =Aj! Or A, f! -Ca alloy is simultaneously sprayed by arc spraying.
Ａｌ又はＡｌ合金の押出管材としては、ＪＩＳ１０５０
、’ ３００３． Ａ １−０．５％Ｃｕ等のＡ、１２
合金又は溶融温度が６２０’Ｃ以上の全てのＡｌ合金を
用いることができる。表面にアーク溶射するＺｎは、ろ
う付加熱により管材表面に、Ｚｎの拡散層を設けるため
である。Ｚｎ付着量は３〜３０ｇ／尻の範囲が良く、好
ましくは５〜１５ｇ／ｍが良い。Ｚｎと同時に溶射する
Ａｌ又はＡｌ−Ｃａ合金は、Ｚｎの蒸発を抑制する役割
を持つ。JIS1050 is used as an extruded pipe material of Al or Al alloy.
,' 3003. A 1-0.5% Cu etc., 12
All alloys or Al alloys with a melting temperature of 620'C or higher can be used. The reason for the arc spraying of Zn onto the surface is to provide a Zn diffusion layer on the surface of the tube material due to brazing heat. The amount of Zn deposited is preferably in the range of 3 to 30 g/m, preferably 5 to 15 g/m. Al or Al-Ca alloy, which is sprayed simultaneously with Zn, has the role of suppressing the evaporation of Zn.
第１図はＺｎと同時にＡｌ又はＡｌ−Ｃａ合金を同時に
溶射したものの断面模式図で、Ｚｎの蒸発を抑制する理
由は、押出管材（１）の表面に溶射したＺｎ粒子（５）
の一部をＡｌ粒子（６）が覆うこと及び溶射時にＺｎ−
Ａｌ合金層（７）が形成され、更にろう付過程において
Ｚｎ−Ａｌ合金層が生長し、溶射層の溶＠温度が上昇す
るためである。またＡＪ−Ｃａ合金をＺｎと同時に溶射
した場合には、真空ろう付時に溶射層のごく表層にＣａ
の酸化物が形成されるため、Ｚｎの蒸発が抑制され、更
に効果がある。Figure 1 is a schematic cross-sectional view of Zn and Al or Al-Ca alloy simultaneously sprayed.The reason for suppressing Zn evaporation is that Zn particles (5) sprayed on the surface of extruded pipe material (1)
Zn-
This is because the Al alloy layer (7) is formed and the Zn--Al alloy layer grows during the brazing process, increasing the melting temperature of the sprayed layer. In addition, when AJ-Ca alloy is sprayed at the same time as Zn, Ca is deposited on the very surface layer of the sprayed layer during vacuum brazing.
Since oxides of Zn are formed, evaporation of Zn is suppressed, which is more effective.
Ａｌ−Ｃａ合金のＣａｍは０．２〜５％程度が好ましい
。Cam of the Al-Ca alloy is preferably about 0.2 to 5%.
ＺｎとＡｌ又はＡｌ−Ｃａ合金を同時に溶射する方法は
、アーク溶射による。The method for simultaneously spraying Zn and Al or Al-Ca alloy is by arc spraying.
Ｚｎのアーク溶射法では通常Ｚｎの２本の線間にアーク
を発生させ、その熱で２本の線を溶融させ、空気又は不
活性ガス等により被溶射物に吹きつけるものであり、本
発明においては１本が７−ｎ線、他の１本がＡｌ又はＡ
ｌ−Ｃａ合金線を用いて溶射するものである。尚溶射は
熱間又は温間で押出成形された直後の高温で表面が活性
な状態にある管材に溶射するのが好ましく、その他押出
成形した後冷却し、プラスチング又は再加熱後溶射して
もよい。In the Zn arc spraying method, an arc is usually generated between two Zn wires, the two wires are melted by the heat, and air or inert gas is blown onto the object to be sprayed. In this case, one wire is 7-n wire and the other wire is Al or A
Thermal spraying is performed using l-Ca alloy wire. In addition, thermal spraying is preferably performed on pipe materials whose surfaces are active at high temperatures immediately after hot or warm extrusion molding, or alternatively, thermal spraying may be performed after extrusion molding, cooling, plasting, or reheating and then thermal spraying. good.
（実施例〕
第２図に示すように、熱間押出機（８）によりダイス（
１０）を通してビレット（９）を押出し、押出直後の高
温状態のＡｌ−０．５％Ｃｕ合金よりなる肉厚０．８ｍ
の管材（１）表面に、アーク溶射機（１１）によりＺｎ
とＡｆ又はＡｌ−１％Ｃａ合金の線を用いて２０ｇ／Ｔ
Ｉｔの付＠量となるように溶射した。(Example) As shown in Fig. 2, a die (
10), extrude the billet (9) through a 0.8 m thick Al-0.5% Cu alloy in a high temperature state immediately after extrusion.
The surface of the pipe material (1) is coated with Zn using an arc spraying machine (11).
and 20g/T using Af or Al-1%Ca alloy wire.
Thermal spraying was carried out to give an amount of It.
これ等管材について、圧力５ Ｘ １０−５ Ｔｏｒｒ
、６００℃で５分間真空ろう付けを想定した加熱を行な
った後、ＥＰＭＡにより管材表面層のＺｎ拡散状況を分
析すると共に、耐食性評価のためにＣＡＳＳ試験を行な
い、貫通孔食発生までの時間を調べた。その結果を第１
表に示す。For these tubes, the pressure is 5 x 10-5 Torr.
After heating at 600°C for 5 minutes assuming vacuum brazing, the Zn diffusion situation in the surface layer of the pipe material was analyzed using EPMA, and a CASS test was conducted to evaluate corrosion resistance, and the time until penetration pitting corrosion occurred was measured. Examined. The result is the first
Shown in the table.
第１表から明らかなように、従来法Ｎα３のＺｎのみを
溶射した管材では、最大Ｚｎ１度が０．２％であり、Ｃ
ＡＳＳ試験では３６０時間で貫通孔食が発生した。これ
に対しＺｎとＡｌを同時に溶射した本発明法Ｎα１及び
ＺｎとＡｌ−１％Ｃａ合金を同時に溶射した本発明法Ｎ
Ｑ２では最大Ｚｎ濃度０．８〜１．２％であり、貫通孔
食が発生するまでに、２１００〜２３００時間かがり、
明らかに従来法Ｎα３より耐食性が優れているのが判る
。As is clear from Table 1, in the pipe material sprayed only with Zn of Nα3 using the conventional method, the maximum Zn1 degree is 0.2%, and the C
In the ASS test, through-pitting corrosion occurred after 360 hours. On the other hand, the present invention method Nα1, in which Zn and Al were simultaneously sprayed, and the present invention method N, in which Zn and Al-1%Ca alloy were simultaneously sprayed.
In Q2, the maximum Zn concentration was 0.8 to 1.2%, and it took 2100 to 2300 hours to cause through pitting corrosion.
It can be seen that the corrosion resistance is clearly superior to the conventional method Nα3.
このように本発明によれば、真空ろう付時のＺｎの蒸発
を抑制し、管材表面にＺｎを多く残存させることができ
るもので、熱交換器用管材の耐食性を著しく向上させる
ことができる等工業上顕著な効果を奏するものである。As described above, according to the present invention, the evaporation of Zn during vacuum brazing can be suppressed and a large amount of Zn can remain on the surface of the tube material, and the corrosion resistance of the tube material for heat exchangers can be significantly improved. This has a remarkable effect.
第１図は本発明によりＺｎと同時にＡｌ又はＡｌ−Ｃａ
合金を同時に溶射したものの断面模式図、第２図は溶射
方法の一例を示す説明図、第３図はエアコン用熱交換器
の一例を示す斜視図でおる。
１、管材
２、フィン
３、コネクター
４、曲げ部
５．２ｎ粒子
６、Ａｌ粒子
７．２ｎ−Ａｌ合金層
８、押出機
９、ビレット
１０、ダイス
１１．７−ク溶射礪
第１図
Ｎ−１
第２図
第３図Figure 1 shows that Al or Al-Ca is used simultaneously with Zn according to the present invention.
FIG. 2 is an explanatory view showing an example of a thermal spraying method, and FIG. 3 is a perspective view showing an example of a heat exchanger for an air conditioner. 1, tube material 2, fins 3, connector 4, bent part 5.2n particles 6, Al particles 7.2n-Al alloy layer 8, extruder 9, billet 10, die 11.7-k thermal spraying plate Fig. 1 N- 1 Figure 2 Figure 3
Claims (1)
はＡｌ−Ｃａ合金を同時にアーク溶射により溶射するこ
とを特徴とする熱交換器用管材の製造方法。A method for manufacturing a heat exchanger tube material, which comprises simultaneously spraying Zn and Al or an Al-Ca alloy on the surface of an extruded Al or Al alloy tube material by arc spraying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29321987A JPH01133671A (en) | 1987-11-20 | 1987-11-20 | Manufacture of tubular material for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29321987A JPH01133671A (en) | 1987-11-20 | 1987-11-20 | Manufacture of tubular material for heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01133671A true JPH01133671A (en) | 1989-05-25 |
Family
ID=17791965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29321987A Pending JPH01133671A (en) | 1987-11-20 | 1987-11-20 | Manufacture of tubular material for heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01133671A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04197578A (en) * | 1990-11-27 | 1992-07-17 | Aisin Seiki Co Ltd | Brazing method |
| EP0605323A1 (en) * | 1992-12-29 | 1994-07-06 | Showa Aluminum Corporation | Corrosion-resistant and brazeable aluminum material and a method of producing same |
| EP0595601B2 (en) † | 1992-10-30 | 2001-07-11 | Showa Aluminum Corporation | Brazeable aluminum material and a method of producing same |
| JP2002329231A (en) * | 2001-04-27 | 2002-11-15 | Oki Electric Ind Co Ltd | Automatic transaction device |
| JP2006188756A (en) * | 2004-12-07 | 2006-07-20 | Showa Denko Kk | Heat exchanger tube with high corrosion resistance, heat exchanger, and method for producing the heat exchanger |
| JP2010085066A (en) * | 2008-10-02 | 2010-04-15 | Mitsubishi Alum Co Ltd | Aluminum alloy extrusion tube for fin tube type air conditioner heat exchanger |
-
1987
- 1987-11-20 JP JP29321987A patent/JPH01133671A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04197578A (en) * | 1990-11-27 | 1992-07-17 | Aisin Seiki Co Ltd | Brazing method |
| EP0595601B2 (en) † | 1992-10-30 | 2001-07-11 | Showa Aluminum Corporation | Brazeable aluminum material and a method of producing same |
| EP0605323A1 (en) * | 1992-12-29 | 1994-07-06 | Showa Aluminum Corporation | Corrosion-resistant and brazeable aluminum material and a method of producing same |
| AU675673B2 (en) * | 1992-12-29 | 1997-02-13 | Showa Denko Kabushiki Kaisha | Corrosion-resistant and brazeable aluminum material and a method of producing same |
| KR100320146B1 (en) * | 1992-12-29 | 2002-04-06 | 오하시 미츠오 | Anti-corrosion aluminum material for soldering and manufacturing method |
| JP2002329231A (en) * | 2001-04-27 | 2002-11-15 | Oki Electric Ind Co Ltd | Automatic transaction device |
| JP2006188756A (en) * | 2004-12-07 | 2006-07-20 | Showa Denko Kk | Heat exchanger tube with high corrosion resistance, heat exchanger, and method for producing the heat exchanger |
| JP2010085066A (en) * | 2008-10-02 | 2010-04-15 | Mitsubishi Alum Co Ltd | Aluminum alloy extrusion tube for fin tube type air conditioner heat exchanger |
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