JPS6321741B2 - - Google Patents
Info
- Publication number
- JPS6321741B2 JPS6321741B2 JP56042881A JP4288181A JPS6321741B2 JP S6321741 B2 JPS6321741 B2 JP S6321741B2 JP 56042881 A JP56042881 A JP 56042881A JP 4288181 A JP4288181 A JP 4288181A JP S6321741 B2 JPS6321741 B2 JP S6321741B2
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- clad
- core material
- skin material
- pitting corrosion
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 56
- 239000011162 core material Substances 0.000 claims description 24
- 230000007797 corrosion Effects 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 17
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000005219 brazing Methods 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000012360 testing method Methods 0.000 description 11
- 238000005253 cladding Methods 0.000 description 8
- 238000007654 immersion Methods 0.000 description 8
- 239000000956 alloy Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 239000011701 zinc Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
-
- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al as the principal constituent
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Description
〔産業上の利用分野〕
本発明は耐孔食性の優れたアルミニウム合金ク
ラツド材に関するもので、特にいかなる腐食環境
に晒しても孔食が深くならず、真空又は不活性ガ
ス中でのブレージングによる耐孔食性の低下を防
止したものである。
〔従来の技術〕
従来、耐孔食性アルミニウム合金クラツド材
（以下クラツド材と略記）には、Mn1.0〜1.5wt
％、Cu0.05〜0.20wt％（以下wt％を単に％と略
記）、残部Alからなるアルミニウム合金（3003合
金）を芯材とし、その片面又は両面に皮材として
Zn0.8〜1.3％、残部Alからなるアルミニウム合金
（7072合金）をクラツドしたものが用いられてい
る。このクラツド材は腐食性雰囲気中に曝露され
ると、芯材に比べて電位の低い皮材が犠牲陽極と
なつて優先的に腐食し、芯材の腐食を防止する所
謂陰極防食効果により、芯材の深い孔食（貫通に
至る）発生を抑制するものである。
このようなクラツド材は種々の用途に用いられ
ており、特に熱交換器の製造においては、このク
ラツド材をフラツクスを用いて大気中でブレージ
ング（ろう接）を行なつたり、溶融フラツクス中
でブレージングが行なわれていたが、フラツクス
を用いるブレージングでは、ブレージング後にフ
ラツクスを除去する必要があるばかりか、公害上
の問題もあり、近年はフラツクスを用いずに真空
又は不活性ガス中でブレージングが行なわれてい
る。
〔発明が解決しようとする問題点〕
しかるに、真空中でブレージングを行なうと、
クラツド材の皮材であるA7072合金中に含まれる
Znがブレージングの際に飛散し、皮材の亜鉛濃
度が極端に減少するため、陰極防食効果がほとん
どなくなり、強い腐食雰囲気に晒されると芯材に
達する孔食を発生し、遂には貫通孔を生ずる欠点
がある。
また、このクラツド材は、不活性ガス中のブレ
ージングのようにZnが飛散しない場合でも、高
温と低温を繰返すような水を媒体とする腐食雰囲
気において、水の質、例えばHCO- 3を多量に含
み、PHが上昇し易い状態の水質によつては、皮材
である7072合金の効果が薄くなり、深い孔食を発
生する欠点があつた。
〔問題点を解決するための手段〕
本発明はこれに鑑み、種々検討の結果、いかな
る腐食環境に晒しても孔食が深くならず、真空又
は不活性ガス中でブレージングを行なつても耐孔
食性を低下することのないクラツド材を開発した
もので、Mn0.5〜2.0％とCu0.5％を越えて2.0％以
下を含み、残部Alと通常の不純物からなるアル
ミニウム合金を芯材とし、その片面又は両面に皮
材としてFeとSiの合計含有量が0.4％以下の純ア
ルミニウムをクラツドしたことを特徴とするもの
である。
〔作用〕
即ち本発明は、皮材に真空ブレージングにより
飛散する元素を一切含まず、かつ不純物として
Fe及びSiの合計含有量を0.4％以下に規制するこ
とにより、皮材としての電位を低く保つと同時
に、種々の水質に対する耐孔食性を向上せしめ、
芯材として通常のAlにMn0.5〜2.0％、Cu0.5％を
越えて2.0％以下を含有せしめることにより、芯
材としての強度を保持せしめると同時に、電位を
高く保持せしめて、皮材に対し50mV以上（５％
NaCl溶液中）高い電位を付与せしめたものであ
る。
しかして、皮材における不純物としてのFe及
びSiの合計含有量を0.4％以下に限定した理由は、
FeとSiは避けることのできない不純物で、アル
ミニウムに固溶しにくく、晶出物は電位的に高く
なつて局部電池を形成し、0.4％を越えると皮材
自体の耐食性を低下し、同時にマクロ的に見た場
合の皮材の電位を高くする要因となるためであ
る。
またMn0.5〜2.0％、Cu0.5％を越えて2.0％以下
に限定した理由は、Mn及びCuはアルミニウムに
固溶すると電位を高め、皮材との電位差を大きく
するも、Mn含有量が0.5％未満、Cu含有量が0.5
％以下では電位を高める効果が少なく、芯材とし
ての強度を低下し、またMn含有量が2.0％を越え
ても、Cu含有量が2.0％を越えても電位を高める
効果は飽和し、塑性加工性を低下するためであ
る。
本発明クラツド材は主として自動車用ラジエタ
ーの水管に適しており、この場合には第１図に示
すように、芯材１の片面に皮材２をクラツドし、
芯材１の他面にAl―Si系のろう材３をクラツド
した３相クラツド材として用いられる。皮材２と
ろう材３のクラツド比は、板厚によつて変るが３
〜20％の範囲とする。特にラジエターの水管は
0.3〜0.5mmの板厚が主であり、この場合には、皮
材、ろう材とも全板厚の７〜10％の割合でクラツ
ドするのが好ましい。
本発明クラツド材は、塩分の強い腐食性雰囲気
の場合には皮材と芯材の電位差が有効に働き、電
位の低い皮材が犠牲陽極となつて芯材を保護する
ものである。特に水のように比較的穏やかな腐食
性雰囲気で、しかもHCO- 3を多く含み、PHが上昇
し易い雰囲気では、純アルミニウムからなる皮材
の表面には均一な皮膜を形成するため、不均質皮
膜を形成する従来の皮材（7072合金）に比較し、
はるかに優れた耐孔食性を示す。このように本発
明クラツド材は皮材が耐孔食性を有し、たとえ腐
食環境の厳しい所で皮材が腐食したとしても、腐
食が芯材に達した時には、皮材と芯材の電位差に
よつて電位の低い皮材が陽極となり、芯材を保護
するものである。
以下本発明を実施例について説明する。
〔実施例〕
第１表に示す組成の皮材用純アルミニウム材
と、第２表に示す組成の芯材用アルミニウム合金
材とろう材を用いて、第１図に示すように芯材１
の片面に皮材２をクラツドし、芯材１の他面にろ
う材３をクラツドし、通常の方法でブレージング
用クラツド材を製造した。ろう材には真空ブレー
ジング用（Al―10％Si―1.5％Mg）と不活性ガス
ブレージング用（Al―10％Si―0.05Bi―0.001Be）
を用い、全板厚0.4mm、皮材のクラツド比を10％、
ろう材のクラツド比を12％とした。
このクラツド材を用い、第２図に示すように、
ろう材３上に板厚0.16mmのA3003からなるフイン
材４を組合せてブレージングを行なつた後、皮材
及び芯材の電位測定を行なつた。その結果を第１
表及び第２表に併記した。ブレージングは、５×
10-5torr中で600℃の温度に５分間加熱する真空
ブレージングと、N2ガス中で600℃の温度に10分
間加熱する不活性ガスブレージングについて行な
つた。また、電位測定は５％NaCl溶液（25℃）
中で行なつた。
また、このようにしてブレージングしたものに
ついて、クラツド材の交互浸漬試験、人工水浸漬
試験(A)及び人工水浸漬試験(B)による腐食試験を行
なつた。その結果を第３表に示す。
交互浸漬試験は、５％NaCl（室温）に10分間浸
漬し、続いて50℃の温度で50分間乾燥することを
720回（１カ月）繰返したものである。
人工水浸漬試験(A)はASTM人工水
（100ppmNaCl，100ppmNaHCO3，
100ppmNa2SO4）に10ppmのCu++を添加した試
験水に浸漬し、室温に16時間、80℃の温度に８時
間の冷却と加熱を２カ月間繰返したものである。
また人工水浸漬試験(B)は、10倍濃度のASTM
人工水に10ppmのCu++を加えた試験水を用い、
人工水浸漬試験(A)と同様にして行なつた。
[Industrial Application Field] The present invention relates to an aluminum alloy clad material with excellent pitting corrosion resistance.In particular, pitting corrosion does not become deep even when exposed to any corrosive environment, and it is resistant to brazing in vacuum or inert gas. This prevents a decrease in pitting corrosion. [Conventional technology] Conventionally, pitting corrosion-resistant aluminum alloy cladding materials (hereinafter abbreviated as cladding materials) contain Mn1.0 to 1.5wt.
%, Cu0.05~0.20wt% (hereinafter wt% is simply abbreviated as %), and the balance is aluminum alloy (3003 alloy) as a core material, and one or both sides of the aluminum alloy (3003 alloy) are used as a skin material.
A clad aluminum alloy (7072 alloy) consisting of 0.8 to 1.3% Zn and the balance Al is used. When this clad material is exposed to a corrosive atmosphere, the skin material, which has a lower potential than the core material, acts as a sacrificial anode and corrodes preferentially, preventing the core material from corroding due to the so-called cathodic protection effect. This suppresses the occurrence of deep pitting corrosion (leading to penetration) in the material. Such clad materials are used for a variety of purposes, especially in the manufacture of heat exchangers, where the clad materials are brazed (soldered) in the atmosphere using flux or brazed in molten flux. However, brazing using flux not only requires the flux to be removed after brazing, but also poses pollution problems, so in recent years brazing has been performed in a vacuum or inert gas without using flux. ing. [Problems to be solved by the invention] However, when brazing is performed in a vacuum,
Contained in A7072 alloy, which is the skin material of Clad wood.
Zn is scattered during brazing, and the zinc concentration in the skin material is extremely reduced, resulting in almost no cathodic protection effect, and when exposed to a strong corrosive atmosphere, pitting corrosion that reaches the core material occurs, and eventually through-holes occur. There are drawbacks that arise. In addition, even when Zn does not scatter, such as when brazing in an inert gas, this clad material can be used in a corrosive atmosphere where water is used as a medium, with repeated high and low temperatures. Depending on the water quality, where the PH level tends to rise, the effect of the 7072 alloy used as the skin material may be reduced, resulting in deep pitting corrosion. [Means for Solving the Problems] In view of this, the present invention has been developed as a result of various studies to prevent deep pitting corrosion even when exposed to any corrosive environment, and to withstand even brazing in vacuum or inert gas. We have developed a clad material that does not reduce pitting corrosion.The core material is an aluminum alloy containing 0.5 to 2.0% Mn, more than 0.5% but less than 2.0% Cu, and the balance Al and normal impurities. It is characterized by having pure aluminum cladding with a total content of Fe and Si of 0.4% or less on one or both sides as a skin material. [Function] That is, the present invention does not contain any elements that are scattered by vacuum brazing in the skin material, and does not contain any elements as impurities.
By regulating the total content of Fe and Si to 0.4% or less, we can maintain a low potential as a skin material and at the same time improve pitting corrosion resistance against various water types.
By adding 0.5% to 2.0% Mn and more than 0.5% but less than 2.0% Cu to normal Al as a core material, it maintains its strength as a core material and at the same time maintains a high potential, making it possible to maintain the strength of the core material. 50mV or more (5%
(in NaCl solution) to which a high potential is applied. However, the reason why the total content of Fe and Si as impurities in the skin material was limited to 0.4% or less was as follows.
Fe and Si are unavoidable impurities that are difficult to solidly dissolve in aluminum, and the crystallized substances become high in potential and form local batteries. This is because it becomes a factor that increases the potential of the skin material when viewed from a physical perspective. The reason for limiting Mn to 0.5 to 2.0% and Cu to 2.0% or less is that when solid dissolved in aluminum, Mn and Cu increase the potential and increase the potential difference with the skin material, but the Mn content is less than 0.5%, Cu content is 0.5
If the Mn content exceeds 2.0% or the Cu content exceeds 2.0%, the effect of increasing the potential will be saturated, and the strength of the core material will decrease. This is because it reduces workability. The clad material of the present invention is mainly suitable for water pipes of automobile radiators, and in this case, as shown in FIG. 1, a skin material 2 is clad on one side of a core material 1.
It is used as a three-phase clad material in which an Al--Si brazing filler metal 3 is clad on the other side of the core material 1. The cladding ratio of skin material 2 and brazing material 3 varies depending on the plate thickness, but is 3.
~20% range. Especially the radiator water pipes.
The main plate thickness is 0.3 to 0.5 mm, and in this case, it is preferable that both the skin material and the brazing material be clad in a proportion of 7 to 10% of the total plate thickness. In the cladding material of the present invention, in the case of a corrosive atmosphere with strong salt content, the potential difference between the skin material and the core material acts effectively, and the skin material with a low potential serves as a sacrificial anode to protect the core material. Particularly in a relatively mildly corrosive atmosphere such as water, which also contains a large amount of HCO - 3 and whose pH tends to rise, a uniform film is formed on the surface of the pure aluminum coating material, resulting in non-uniformity. Compared to the conventional skin material (7072 alloy) that forms a film,
Shows much better pitting corrosion resistance. In this way, the skin material of the clad material of the present invention has pitting corrosion resistance, and even if the skin material corrodes in a harsh corrosive environment, when the corrosion reaches the core material, the potential difference between the skin material and the core material Therefore, the skin material, which has a low potential, becomes an anode and protects the core material. The present invention will be described below with reference to Examples. [Example] Using the pure aluminum material for the skin material having the composition shown in Table 1, and the aluminum alloy material and brazing material for the core material having the composition shown in Table 2, the core material 1 was prepared as shown in FIG.
The skin material 2 was clad on one side of the core material 1, and the brazing material 3 was clad on the other side of the core material 1 to produce a clad material for brazing in a conventional manner. The brazing filler metal is for vacuum brazing (Al-10%Si-1.5%Mg) and for inert gas brazing (Al-10%Si-0.05Bi-0.001Be).
using, the total plate thickness is 0.4 mm, the cladding ratio of the skin material is 10%,
The cladding ratio of the filler metal was set to 12%. Using this clad material, as shown in Figure 2,
After brazing was performed by combining the fin material 4 made of A3003 with a plate thickness of 0.16 mm on the brazing material 3, the potentials of the skin material and the core material were measured. The result is the first
It is also listed in Table and Table 2. Blazing is 5x
Vacuum brazing was carried out by heating to a temperature of 600° C. for 5 minutes in 10 −5 torr, and inert gas brazing was heated to a temperature of 600° C. for 10 minutes in N 2 gas. In addition, the potential measurement was performed using a 5% NaCl solution (25°C).
I did it inside. In addition, corrosion tests were conducted on the brazed materials in this manner by alternating clad material immersion tests, artificial water immersion tests (A), and artificial water immersion tests (B). The results are shown in Table 3. The alternate immersion test consisted of immersion in 5% NaCl (room temperature) for 10 minutes, followed by drying at a temperature of 50°C for 50 minutes.
This was repeated 720 times (one month). Artificial water immersion test (A) was performed using ASTM artificial water (100ppmNaCl, 100ppmNaHCO 3 ,
The sample was immersed in test water containing 100 ppm Na 2 SO 4 ) and 10 ppm Cu ++ , and was repeatedly cooled and heated at room temperature for 16 hours and at 80°C for 8 hours for 2 months. In addition, the artificial water immersion test (B) was performed using ASTM at 10 times the concentration.
Using test water with 10 ppm Cu ++ added to artificial water,
It was conducted in the same manner as the artificial water immersion test (A).
【表】【table】
【表】【table】
【表】【table】
【表】【table】
このように本発明によれば、いかなるブレージ
ングを適用しても腐食環境において優れた耐孔食
性を示すもので、熱交換器等に使用し、その寿命
を向上し得る等顕著な効果を奏するものである。
As described above, the present invention exhibits excellent pitting corrosion resistance in a corrosive environment no matter what kind of brazing is applied, and can be used in heat exchangers, etc., and has remarkable effects such as improving the life of such devices. It is.
第１図は本発明クラツド材の一例を示す断面
図、第２図は腐食試験用ブレージング材を示す断
面図である。
１…芯材、２…皮材、３…ろう材、４…フイン
材。
FIG. 1 is a sectional view showing an example of the cladding material of the present invention, and FIG. 2 is a sectional view showing a brazing material for corrosion testing. 1...core material, 2...skin material, 3...brazing material, 4...fin material.
Claims (1)
％以下を含み、残部Alと通常の不純物からなる
アルミニウム合金を芯材とし、その片面又は両面
に皮材としてFeとSiの合計含有量が0.4wt％以下
の純アルミニウムをクラツドしたことを特徴とす
る耐孔食性アルミニウム合金クラツド材。1 Mn0.5~2.0wt% and Cu2.0wt over 0.5wt%
% or less, with the balance being Al and normal impurities as a core material, and one or both sides of the core material is clad with pure aluminum with a total content of Fe and Si of 0.4 wt% or less. Pitting corrosion resistant aluminum alloy clad material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4288181A JPS57158350A (en) | 1981-03-24 | 1981-03-24 | Aluminum alloy clad material with pitting corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4288181A JPS57158350A (en) | 1981-03-24 | 1981-03-24 | Aluminum alloy clad material with pitting corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57158350A JPS57158350A (en) | 1982-09-30 |
| JPS6321741B2 true JPS6321741B2 (en) | 1988-05-09 |
Family
ID=12648374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4288181A Granted JPS57158350A (en) | 1981-03-24 | 1981-03-24 | Aluminum alloy clad material with pitting corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57158350A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60187653A (en) * | 1984-03-06 | 1985-09-25 | Furukawa Alum Co Ltd | Al and al alloy for fin material of heat exchanger |
| JPS6182992A (en) * | 1984-09-28 | 1986-04-26 | Furukawa Alum Co Ltd | Al alloy brazing sheet |
| JPS6285937A (en) * | 1985-09-13 | 1987-04-20 | 株式会社神戸製鋼所 | Aluminum alloy composite material having excellent corrosionresistance |
| JPS62199746A (en) * | 1986-02-25 | 1987-09-03 | Showa Alum Corp | Tube material for heat exchanger made of aluminum |
| KR100323375B1 (en) * | 1993-04-06 | 2002-06-20 | 앨컨인터내쇼날리미팃드 | Aluminum Alloy Leaded Sheets |
| ES2527206T3 (en) * | 2008-01-18 | 2015-01-21 | Hydro Aluminium Rolled Products Gmbh | Composite material with corrosion protection layer and production process |
| JP5537103B2 (en) * | 2009-09-16 | 2014-07-02 | 株式会社Ｕａｃｊ | Al alloy clad material with excellent corrosion resistance in acidic environment |
| FR2967765B1 (en) * | 2010-11-19 | 2015-03-06 | Valeo Systemes Thermiques | ARMABLE COMPONENT AND HEAT EXCHANGER HAVING THE SAME |
| JP2018028129A (en) * | 2016-08-17 | 2018-02-22 | 株式会社Uacj | Aluminum alloy clad plate for heat exchanger |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644742A (en) * | 1979-09-19 | 1981-04-24 | Sumitomo Light Metal Ind Ltd | Aluminum alloy clad for heat exchanger |
-
1981
- 1981-03-24 JP JP4288181A patent/JPS57158350A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644742A (en) * | 1979-09-19 | 1981-04-24 | Sumitomo Light Metal Ind Ltd | Aluminum alloy clad for heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57158350A (en) | 1982-09-30 |
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