JP2006037135A - Highly corrosion resistant aluminum clad material for heat exchanger - Google Patents
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Abstract
Description
本発明は、熱交換器とくに自動車熱交換器に使用されるアルミニウムクラッド材、とくに、熱交換器と接続される配管材(押出クラッド管材)、真空ろう付けやフッ化物系フラックスやセシウム化物系フラックスを用いた不活性ガス雰囲気ろう付けにより接合されるエバポレータ、コンデンサ、ラジエータ、ヒータコア、インタークーラ、オイルクーラなどのアルミニウム合金製自動車熱交換器用のチューブ材、接着、溶接、はんだ付けなどの非ろう付け方式で接続される熱交換器用チューブ材として好適な熱交換器用高耐食アルミニウムクラッド材に関する。 The present invention relates to aluminum clad materials used in heat exchangers, particularly automobile heat exchangers, in particular piping materials (extruded clad pipe materials) connected to heat exchangers, vacuum brazing, fluoride fluxes and cesium fluoride fluxes. Non-brazing such as tubes, bonding, welding and soldering for aluminum alloy automotive heat exchangers such as evaporators, condensers, radiators, heater cores, intercoolers, oil coolers, etc. joined by brazing in an inert gas atmosphere The present invention relates to a highly corrosion-resistant aluminum clad material for a heat exchanger suitable as a tube material for a heat exchanger to be connected in a system.
自動車熱交換器、例えばラジエータは、外面にフィンを有し、内面が作動流体(不凍液)の通路となるチューブおよびヘッダーから構成されている。このような自動車のラジエータまたはヒータコアなどのチューブ材、ヘッダープレート材としては、JIS A3003などのAl−Mn系合金を芯材とし、芯材の片面にAl−Si系合金ろう材をクラッドした二層構造のアルミニウム合金クラッド材、芯材の一方の面にろう材をクラッドし、他方の面にAl−Zn系合金またはAl−Zn−Mg系合金の犠牲陽極材をクラッドした三層構造のアルミニウム合金クラッド材が用いられている。 An automobile heat exchanger, for example, a radiator, includes a tube and a header having fins on the outer surface, and the inner surface serving as a passage for a working fluid (antifreeze). As a tube material and header plate material such as an automobile radiator or heater core, an Al-Mn alloy such as JIS A3003 is used as a core material, and an Al-Si alloy brazing material is clad on one side of the core material. Aluminum alloy clad material with a three-layer structure in which a brazing material is clad on one surface of the core material and a sacrificial anode material of Al-Zn alloy or Al-Zn-Mg alloy is clad on the other surface A clad material is used.
クラッド材のAl−Si系ろう材は、アルミニウム合金製熱交換器を製作するとき、チューブとフィンとの接合、チューブとヘッダープレートとの接合、またはクラッド板からろう付けによりチューブを製造する場合のろう付け接合のためにクラッドされている。また、犠牲陽極材は、たとえばチューブの内面側に使用され、作動流体と接して犠牲陽極作用を発揮し、芯材の孔食や隙間腐食の発生を防止する。 When manufacturing an aluminum alloy heat exchanger, the clad Al-Si brazing material is used when a tube is manufactured by joining a tube and a fin, joining a tube and a header plate, or brazing a clad plate. It is clad for brazing. The sacrificial anode material is used, for example, on the inner surface side of the tube, and exerts a sacrificial anode action in contact with the working fluid, thereby preventing pitting corrosion and crevice corrosion of the core material.
近年、自動車の軽量化の要請に伴い、自動車熱交換器においても省エネルギー、省資源の観点から構成材料の薄肉化が要請され、チューブ材についても薄肉化が進行している。チューブ材を薄肉化するためには、材料の強度をさらに高める必要があり、芯材に多量のCu、Si、Mnなどが含有されるが、これらの元素の含有により芯材の耐食性が低下するため、犠牲陽極材に多量のZnを添加して芯材との電位差を確保し、確実に犠牲陽極効果が得られるようにした材料構成が提案されている。 In recent years, with the demand for lighter automobiles, automobile heat exchangers are also required to be made thinner from the viewpoint of energy saving and resource saving, and the tube materials are also becoming thinner. In order to make the tube material thinner, it is necessary to further increase the strength of the material, and the core material contains a large amount of Cu, Si, Mn, etc., but the inclusion of these elements reduces the corrosion resistance of the core material. Therefore, a material configuration has been proposed in which a large amount of Zn is added to the sacrificial anode material to ensure a potential difference from the core material and to ensure the sacrificial anode effect.
例えば、ラジエータなど自動車用熱交換器のチューブ材として、Mn:0.2〜1.5%、Si:0.3〜1.3%を含有するAl−Mn系合金の芯材の一方の面にAl−Si系合金ろう材をクラッドし、他方の面に5%以下のZnを含有するAl−Zn合金をクラッドし、芯材のCu量を0.6%以下に規定してなり、ろう付け後の芯材と犠牲陽極材との電位差が30〜120mVであり、とくに当該熱交換器がフッ化物系フラックスを用いる不活性ガス雰囲気ろう付けに組み立てられる場合に優れた耐食性が得られるアルミニウム合金複合材が提案されている(特許文献1参照)。 For example, one surface of a core material of an Al-Mn alloy containing Mn: 0.2 to 1.5% and Si: 0.3 to 1.3% as a tube material of an automotive heat exchanger such as a radiator Clad with an Al—Si alloy brazing material, clad with an Al—Zn alloy containing 5% or less of Zn on the other surface, and the Cu content of the core material is defined as 0.6% or less. Aluminum alloy having a potential difference between the core material after sacrificing and the sacrificial anode material of 30 to 120 mV, and excellent corrosion resistance especially when the heat exchanger is assembled in an inert gas atmosphere brazing using a fluoride-based flux A composite material has been proposed (see Patent Document 1).
また、Al−Mn系合金からなる芯材にクラッドされる犠牲陽極材について、犠牲陽極材のZn含有量(1〜5%)と犠牲陽極材の厚さ(5〜50μm)を組み合わせ、犠牲陽極材中のCu量を0.05%以下に規制して、薄肉化を可能としながらも、ろう付け後に優れた耐食性が得られる自動車用熱交換器のチューブ材として好適なアルミニウムクラッド材も提案されている(特許文献2参照)。 Further, a sacrificial anode material clad on a core material made of an Al—Mn alloy is combined with the Zn content (1 to 5%) of the sacrificial anode material and the thickness (5 to 50 μm) of the sacrificial anode material. Also proposed is an aluminum clad material suitable as a tube material for automotive heat exchangers that provides excellent corrosion resistance after brazing while regulating the Cu content in the material to 0.05% or less and enabling thinning. (See Patent Document 2).
しかしながら、犠牲陽極材への多量のZnの添加は、犠牲陽極効果が達成される反面、犠牲陽極材の自己腐食速度が大きくなり犠牲陽極材の消耗を早めることがある。また、犠牲陽極材には、犠牲陽極材中に不純物として含まれているFe、SiなどがAl−Si系化合物やAl−Fe系化合物として分散しており、これらの化合物のうち表面に露出している化合物は耐食性を保持するための酸化皮膜の欠陥となり、この欠陥が腐食の起点となって腐食が生じ、腐食が生じた後は、これら化合物がカソードとなって化合物の周囲が優先的に腐食し、腐食速度を高める。 However, when a large amount of Zn is added to the sacrificial anode material, the sacrificial anode effect is achieved, but the sacrificial anode material has a high self-corrosion rate, and the sacrificial anode material may be consumed quickly. In the sacrificial anode material, Fe, Si and the like contained as impurities in the sacrificial anode material are dispersed as Al-Si compounds and Al-Fe compounds, and these compounds are exposed on the surface. These compounds become defects in the oxide film to maintain corrosion resistance, and these defects become the starting point of corrosion, causing corrosion. After corrosion occurs, these compounds become cathodes and the surroundings of the compounds are preferentially used. Corrodes and increases the corrosion rate.
上記の現象は、薄肉化された犠牲陽極材においてとくに顕著となる。従って、クラッド材を薄肉化するために犠牲陽極材を低減した場合には、上記の現象によって短期間で犠牲陽極材が消耗する。クラッド材の薄肉化に際し、犠牲陽極材は薄肉化せず芯材のみを薄くした場合には、クラッド材の剛性の維持が困難となる。
発明者らは、熱交換器のチューブ材における前記従来の問題点を解消するために、犠牲陽極材の自己耐食性を向上させるとともに、犠牲陽極効果も得られるチューブ材用アルミニウムクラッド材の構成について試験、検討を重ねた結果、犠牲陽極材として、不純物のSi、Feが少ないアルミニウム純度の高いアルミニウム材を適用することにより、クラッド材の薄肉化に伴って犠牲陽極材の厚さを低減した場合にも、犠牲陽極材の自己耐食性と犠牲陽極効果の両特性を維持することが可能であることを見出した。 The inventors tested the configuration of an aluminum clad material for a tube material that improves the self-corrosion resistance of the sacrificial anode material and also provides the sacrificial anode effect in order to eliminate the above-mentioned conventional problems in the tube material of the heat exchanger. As a result of repeated studies, when the thickness of the sacrificial anode material is reduced as the thickness of the clad material is reduced by applying a high purity aluminum material with less Si and Fe impurities as the sacrificial anode material. It was also found that both the self-corrosion resistance and the sacrificial anode effect of the sacrificial anode material can be maintained.
本発明は、上記の知見に基づいてさらに検討を加えた結果としてなされたものであり、その目的は、熱交換器とくに自動車用熱交換器のチューブ材、例えば、熱交換器と接続される配管材(押出クラッド管材)、真空ろう付けやフッ化物系フラックスやセシウム化物系フラックスを用いた不活性ガス雰囲気ろう付けにより接合されるエバポレータ、コンデンサ、ラジエータ、ヒータコア、インタークーラ、オイルクーラなどのアルミニウム合金製自動車熱交換器のチューブ材、接着、溶接、はんだ付けなどの非ろう付け方式で接続される熱交換器用チューブ材として好適に使用される熱交換器用高耐食アルミニウムクラッド材を提供することにある。 The present invention has been made as a result of further investigation based on the above-described knowledge, and the object thereof is a tube material of a heat exchanger, particularly an automobile heat exchanger, for example, a pipe connected to the heat exchanger. Aluminum alloys such as evaporators, condensers, radiators, heater cores, intercoolers and oil coolers that are joined by brazing materials (extruded clad pipe materials), vacuum brazing, and inert gas atmosphere brazing using fluoride or cesium fluxes To provide a highly corrosion-resistant aluminum clad material for a heat exchanger that is suitably used as a tube material for a heat exchanger connected by a non-brazing method such as a tube material of an automobile heat exchanger, bonding, welding, soldering, etc. .
上記の目的を達成するための請求項1による熱交換器用高耐食アルミニウムクラッド材は、アルミニウムからなる芯材の少なくとも一方の面に犠牲陽極材をクラッドしたアルミニウムクラッド材であって、犠牲陽極材がアルミニウム純度99.9%以上の純アルミニウムからなることを特徴とする。 In order to achieve the above object, a highly corrosion-resistant aluminum clad material for a heat exchanger according to claim 1 is an aluminum clad material in which a sacrificial anode material is clad on at least one surface of an aluminum core material, It is characterized by comprising pure aluminum having an aluminum purity of 99.9% or more.
請求項2による熱交換器用高耐食アルミニウムクラッド材は、アルミニウムからなる芯材の一方の面に犠牲陽極材をクラッドし、他方の面にAl−Si系ろう材をクラッドしたアルミニウムクラッド材であって、犠牲陽極材がアルミニウム純度99.9%以上の純アルミニウムからなることを特徴とする。 A highly corrosion-resistant aluminum clad material for a heat exchanger according to claim 2 is an aluminum clad material in which a sacrificial anode material is clad on one surface of a core material made of aluminum and an Al-Si brazing material is clad on the other surface. The sacrificial anode material is made of pure aluminum having an aluminum purity of 99.9% or more.
本発明によれば、熱交換器とくに自動車用熱交換器のチューブ材、例えば、熱交換器と接続される配管材(押出クラッド管材)、真空ろう付けやフッ化物系フラックスやセシウム化物系フラックスを用いた不活性ガス雰囲気ろう付けにより接合されるエバポレータ、コンデンサ、ラジエータ、ヒータコア、インタークーラ、オイルクーラなどのアルミニウム合金製自動車熱交換器のチューブ材、接着、溶接、はんだ付けなどの非ろう付け方式で接続される熱交換器用チューブ材として好適に使用される熱交換器用高耐食アルミニウムクラッド材が提供される。 According to the present invention, a tube material of a heat exchanger, in particular, an automotive heat exchanger, for example, a piping material (extruded clad tube material) connected to the heat exchanger, vacuum brazing, fluoride-based flux, or cesium-based flux is used. Non-brazing methods such as tubes, bonding, welding, and soldering for aluminum alloy automotive heat exchangers such as evaporators, condensers, radiators, heater cores, intercoolers, and oil coolers that are joined by brazing using inert gas atmosphere A highly corrosion-resistant aluminum clad material for a heat exchanger that is suitably used as a tube material for a heat exchanger that is connected in the above is provided.
以下、本発明のアルミニウム合金クラッド材の構成について説明する。
(犠牲陽極材)
アルミニウム純度:99.9%以上
アルミニウム純度を99.9%以上とすることにより、腐食の起点となるAl−Fe系化合物やAl−Si系化合物の生成が低減されて、皮膜欠陥がほとんど生じることなく表面の酸化皮膜(保護皮膜)が安定に保持されているため、腐食の発生が抑制される。一旦腐食が発生しても、カソードとして作用するマトリックス中のAl−Fe系化合物やAl−Si系化合物が少ないため、自己腐食速度が遅く、犠牲陽極材の犠牲陽極効果が長期間持続する。アルミニウム純度が99.9%未満ではその効果が十分でなく耐食性が低下する。アルミニウム純度のより好ましい範囲は99.99%以上で、さらに好ましい範囲は99.999%以上である。
Hereinafter, the structure of the aluminum alloy clad material of the present invention will be described.
(Sacrificial anode material)
Aluminum purity: 99.9% or higher By setting the aluminum purity to 99.9% or higher, the generation of Al-Fe compounds and Al-Si compounds, which are the starting points of corrosion, is reduced, and almost all film defects occur. Since the surface oxide film (protective film) is stably maintained, the occurrence of corrosion is suppressed. Even if corrosion occurs once, since there are few Al—Fe compounds and Al—Si compounds in the matrix acting as a cathode, the self-corrosion rate is slow, and the sacrificial anode effect of the sacrificial anode material lasts for a long time. If the aluminum purity is less than 99.9%, the effect is not sufficient and the corrosion resistance is lowered. A more preferable range of aluminum purity is 99.99% or more, and a more preferable range is 99.999% or more.
(芯材)
芯材としてはアルミニウムまたはアルミニウム合金が適用され、芯材用アルミニウムまたはアルミニウム合金は、熱交換器において必要とされる強度に応じて選択される。芯材として、一般的には3000系(Al−Mn系)合金、より強度が要求される場合には2000系(Al−Cu系)合金、5000系(Al−Mg系)合金、6000系(Al−Mg−Si系)合金を使用することができ、8000系合金を用いることもできる。
(Core material)
Aluminum or aluminum alloy is applied as the core material, and the aluminum or aluminum alloy for the core material is selected according to the strength required in the heat exchanger. As a core material, a 3000 series (Al-Mn series) alloy is generally used. When a higher strength is required, a 2000 series (Al-Cu series) alloy, a 5000 series (Al-Mg series) alloy, a 6000 series ( Al—Mg—Si based alloy can be used, and 8000 based alloy can also be used.
本発明における好ましい芯材は、Mn:1.5%を越え2.0%以下を含有し、Cu:0.5%を越え1.0%以下、Si:0.6%を越え1.5%以下の1種または2種を含有するAl−Mn系合金であり、この組成において、芯材の強度がより向上して薄肉化が可能となり、犠牲陽極材との電位差を大きくしてより安定して良好な耐食性を得ることができる。0.3%以下のTi、0.5%以下のMg、0.3%以下のZr、0.2%以下のCrが含有されてもよい。 A preferable core material in the present invention contains Mn: more than 1.5% and 2.0% or less, Cu: more than 0.5% and 1.0% or less, Si: more than 0.6% and 1.5% or less. % Al-Mn alloy containing 1% or 2% or less, and in this composition, the core material is further improved in strength and can be thinned, and the potential difference from the sacrificial anode material is increased to be more stable. And good corrosion resistance can be obtained. Ti of 0.3% or less, Mg of 0.5% or less, Zr of 0.3% or less, and Cr of 0.2% or less may be contained.
(ろう材)
ろう材としては、通常用いられているAl−Si系合金ろう材、例えば、Si:6〜13%を含有するAl−Si系合金ろう材が使用される。熱交換器の接合を真空ろう付けによって行う場合には、Mgを含有するAl−Si−Mg系合金ろう材が適用される。これらAl−Si系合金ろう材、Al−Si−Mg系合金ろう材には、例えば、0.005〜0.1%のSr、0.2%以下のBi、0.1%以下のBe、0.001〜0.05%のIn、0.001〜0.05%のSn、1〜100ppmのNa、2%以下のFe、8%以下のZn、5%以下のCuの1種または2種以上が含有されていてもよい。
(Brazing material)
As the brazing material, a commonly used Al—Si based brazing material, for example, an Al—Si based brazing material containing 6 to 13% of Si is used. When the heat exchanger is joined by vacuum brazing, an Al—Si—Mg alloy brazing material containing Mg is applied. These Al—Si based alloy brazing material and Al—Si—Mg based brazing material include, for example, 0.005 to 0.1% Sr, 0.2% or less Bi, 0.1% or less Be, One or two of 0.001 to 0.05% In, 0.001 to 0.05% Sn, 1 to 100 ppm Na, 2% or less Fe, 8% or less Zn, 5% or less Cu More than one species may be contained.
本発明のアルミニウムクラッド材は、芯材、犠牲陽極材およびろう材を構成するアルミニウム材料を、たとえば、連続鋳造により造塊し、必要に応じて均質化処理後、犠牲陽極材およびろう材の鋳塊については、それぞれ所定厚さまで熱間圧延し、ついで、芯材の鋳塊と犠牲陽極材の熱間圧延材を組み合わせ、あるいは芯材の鋳塊、犠牲陽極材の熱間圧延材、ろう材の熱間圧延材を組み合わせて、常法に従って熱間圧延によりクラッド材とし、その後冷間圧延、中間焼鈍、冷間圧延により所定の厚さとすることによって製造される。 The aluminum clad material of the present invention is formed by agglomerating the aluminum material constituting the core material, the sacrificial anode material and the brazing material, for example, by continuous casting, and after homogenizing treatment as necessary, casting of the sacrificial anode material and the brazing material. Each ingot is hot-rolled to a predetermined thickness, and then the ingot of the core material and the hot-rolled material of the sacrificial anode material are combined, or the ingot of the core material, hot-rolled material of the sacrificial anode material, brazing material These hot-rolled materials are combined into a clad material by hot rolling according to a conventional method, and then made into a predetermined thickness by cold rolling, intermediate annealing, and cold rolling.
以下、本発明の実施例を比較例と対比して説明する。これらの実施例は、本発明の一実施態様を示すものであり、本発明はこれらに限定されるものではない。 Examples of the present invention will be described below in comparison with comparative examples. These examples show one embodiment of the present invention, and the present invention is not limited to these examples.
実施例1
連続鋳造によって表1に示す組成を有する芯材用合金、表2に示す組成を有する犠牲陽極材用合金を造塊し、得られた鋳塊を均質化処理した。
Example 1
The core alloy having the composition shown in Table 1 and the sacrificial anode material alloy having the composition shown in Table 2 were ingoted by continuous casting, and the resulting ingot was homogenized.
ついで、犠牲陽極材用合金の鋳塊を所定の厚さまで熱間圧延し、得られた熱間圧延板と芯材用合金の鋳塊を組み合わせて熱間圧延した後、冷間圧延、中間焼鈍、冷間圧延によって厚さ0.20mmのクラッド材(調質H14)を得た。クラッド材の構成は、犠牲陽極材を0.010〜0.020mm厚さとした。 Next, the ingot of the sacrificial anode material alloy is hot-rolled to a predetermined thickness, and the obtained hot-rolled sheet and the core alloy ingot are hot-rolled in combination, followed by cold rolling and intermediate annealing. Then, a clad material (tempered H14) having a thickness of 0.20 mm was obtained by cold rolling. The structure of the clad material was 0.010 to 0.020 mm thick for the sacrificial anode material.
得られたクラッド材を試験材として、以下の方法により、犠牲陽極材の耐食性を評価した。結果を表3〜5に示す。 Using the obtained clad material as a test material, the corrosion resistance of the sacrificial anode material was evaluated by the following method. The results are shown in Tables 3-5.
犠牲陽極材の耐食性:得られたクラッド材(試験材)を、単板のままフッ化物系フラックスを塗布して窒素ガス雰囲気中で600℃(材料温度)のろう付け温度に加熱した後、犠牲陽極材面について下記の条件で腐食試験を行った。
腐食液:Cl- :300ppm、SO4 2- :100ppm、Cu2+:10pm
比液量:5mL/cm2
シール:芯材面と端面をシリコン樹脂でシールした。
試験方法:88℃に加熱した腐食液中に8時間浸漬した後、冷却して25℃で16時間保持するサイクルを2か月間繰り返して、最大腐食深さを測定し、最大腐食深さ0.03mm以下を耐食性良好とした。
Corrosion resistance of sacrificial anode material: The obtained clad material (test material) was applied as a single plate with fluoride-based flux and heated to a brazing temperature of 600 ° C. (material temperature) in a nitrogen gas atmosphere. A corrosion test was performed on the anode material surface under the following conditions.
Corrosion solution: Cl − : 300 ppm, SO 4 2− : 100 ppm, Cu 2+ : 10 pm
Specific liquid volume: 5 mL / cm 2
Seal: The core material surface and end surface were sealed with silicon resin.
Test method: After immersing in a caustic solution heated to 88 ° C. for 8 hours, a cycle of cooling and holding at 25 ° C. for 16 hours was repeated for 2 months, the maximum corrosion depth was measured, and the maximum corrosion depth was 0. The corrosion resistance was good at 03 mm or less.
表3〜5にみられるように、本発明に従う試験材No.1〜48はいずれも、犠牲陽極材の腐食試験において、最大腐食深さはいずれも0.03mm以下であり、優れた耐食性をそなえている。 As seen in Tables 3-5, the test material No. Nos. 1 to 48 all have a maximum corrosion depth of 0.03 mm or less in the corrosion test of the sacrificial anode material, and have excellent corrosion resistance.
比較例1
連続鋳造によって表6に示す組成を有する犠牲陽極材用合金を造塊し、得られた鋳塊を均質化処理した。
Comparative Example 1
An alloy for a sacrificial anode material having the composition shown in Table 6 was formed by continuous casting, and the resulting ingot was homogenized.
ついで、犠牲陽極材用合金の鋳塊を所定の厚さまで熱間圧延し、得られた犠牲陽極材の熱間圧延板と表1のNo.A3の芯材用合金の鋳塊を組み合わせて熱間圧延した後、冷間圧延、中間焼鈍、冷間圧延によって厚さ0.20mmのクラッド材(調質H14)を得た。クラッド材の構成は、犠牲陽極材を0.020mm厚さとした。なお、表6において、本発明の条件を外れたものには下線を付した。 Subsequently, the ingot of the alloy for sacrificial anode material was hot-rolled to a predetermined thickness, and the obtained hot-rolled plate of the sacrificial anode material and No. 1 in Table 1 were used. A hot-rolling was performed by combining the ingots of the core alloy of A3, and then a clad material (tempered H14) having a thickness of 0.20 mm was obtained by cold rolling, intermediate annealing, and cold rolling. The structure of the clad material was such that the sacrificial anode material was 0.020 mm thick. In Table 6, those outside the conditions of the present invention are underlined.
得られたクラッド材を試験材として、実施例1と同じ方法で犠牲陽極材の耐食性を評価した。結果を表7に示す。 The corrosion resistance of the sacrificial anode material was evaluated by the same method as in Example 1 using the obtained clad material as a test material. The results are shown in Table 7.
表7に示すように、試験材No.49は犠牲陽極材のアルミニウム純度が低いため、また、試験材No.50は、犠牲陽極材が2%のZnを含有するAl−Zn合金であるため、いずれも犠牲陽極材の耐食性が劣っている。 As shown in Table 7, the test material No. No. 49 is a sacrificial anode material having a low aluminum purity. No. 50 is an Al—Zn alloy in which the sacrificial anode material contains 2% Zn, and therefore the sacrificial anode material has poor corrosion resistance.
Claims (2)
An aluminum clad material in which a sacrificial anode material is clad on one surface of a core material made of aluminum and a brazing material is clad on the other surface, and the sacrificial anode material is made of pure aluminum having an aluminum purity of 99.9% or more. High corrosion resistant aluminum clad material for heat exchangers.
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JP2011063841A (en) * | 2009-09-16 | 2011-03-31 | Furukawa-Sky Aluminum Corp | Al ALLOY CLAD MATERIAL HAVING EXCELLENT CORROSION RESISTANCE IN ACID ENVIRONMENT |
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