ALUMINUM ALLOY BRAZING SHEET

PROBLEM TO BE SOLVED: To provide an aluminum alloy brazing sheet excellent in anticorrosion and strength after brazing and also excellent in brazeability on both of a brazing material side and a sacrificial material side in spite of being a thin material of a thickness of less than 200 μm.SOLUTION:...

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Bibliographische Detailangaben
Hauptverfasser: KIMURA SHINHEI, TSURUNO AKIHIRO, SHIBUYA YUJI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an aluminum alloy brazing sheet excellent in anticorrosion and strength after brazing and also excellent in brazeability on both of a brazing material side and a sacrificial material side in spite of being a thin material of a thickness of less than 200 μm.SOLUTION: An aluminum alloy brazing sheet 1 comprises: a core 2; a brazing material 3 comprising an Al-Si-based alloy provided on one surface of the core 2; a first sacrificial material 4 comprising an Al-Zn-based alloy provided on the other surface of the core 2; and a second sacrificial material 5 comprising an Al-Zn-Mg-based alloy provided between the first sacrificial material 4 and the core 2. The brazing sheet 1 has a thickness of less than 200 μm. The core 2 contains predetermined amounts of Mn and Cu, with the remainder comprising Al and unavoidable impurities. The first sacrificial material 4 contains a predetermined amount of Zn, and Mg in an amount less than the predetermined amount, with the balance comprising Al and inevitable impurities. The second sacrificial material 5 contains predetermined amounts of Zn and Mg, with the balance comprising Al and inevitable impurities.SELECTED DRAWING: Figure 1 【課題】板厚200μm未満の薄肉材であっても、ろう付後強度、耐食性に優れ、ろう材側と犠牲材側の両面におけるろう付性にも優れたアルミニウム合金製ブレージングシートを提供する。【解決手段】心材2と、心材2の一方の面に設けられたAl−Si系合金からなるろう材3と、心材2の他方の面に設けられたAl−Zn系合金からなる第1犠牲材4と、第1犠牲材4と心材2との間に設けられたAl−Zn−Mg系合金からなる第2犠牲材5とを備えるアルミニウム合金製ブレージングシート1であって、ブレージングシート1は、板厚が200μm未満であり、心材2は、Mn、Cuを所定量含有し、残部がAlおよび不可避的不純物からなり、第1犠牲材4は、Znを所定量含有し、Mgが所定量未満であり、残部がAlおよび不可避的不純物からなり、第2犠牲材5は、Zn、Mgを所定量含有し、残部がAlおよび不可避的不純物からなることを特徴とする。【選択図】図1