ALUMINUM ALLOY FIN MATERIAL HAVING EXCELLENT STRENGTH, MOLDABILITY, AND CORROSION RESISTANCE AND HEAT EXCHANGER

• Main Authors: IWAO SHOHEI, IMAI YUSUKE, YAMAMOTO MICHIYASU, NAKANISHI SHIGENORI, SHINODA TAKAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 05.11.2020
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a fin excellent in strength, excellent in moldability more than ever, and excellent in the corrosion resistance.SOLUTION: An aluminum alloy fin material having excellent strength, moldability, and corrosion resistance is made an aluminum alloy having a composition made of, by mass%, Mn:1.2 to 2.0%, Si:0.5 to 1.3%, Cu:0.05 to 0.13%, Fe:0.1 to 0.5%, Zn:0.5 to 3.0%, and the balance made of Al and inevitable impurity, in which, on a fin material surface before forming a corrugate, crystal grains having a circle equivalent diameter of 500 μm or larger are present by 10 to 200 grains/cm2, its 90% or larger has a texture long in a rolling direction than a width direction, the tensile strength is 200 to 250 MPa, the elongation is 1.0 to 5.0%, the tensile strength after heat treatment equivalent to soldering holding for 3 minutes at 600°C or higher is 140 MPa or larger, and an amount of corrosion weight loss after 16 weeks of a neutral salt spray test is 150 mg/dm2 or smaller.SELECTED DRAWING: Figure 1 【課題】強度に優れ、従来よりも成形性に優れ、かつ耐食性に優れるフィンを提供する。【解決手段】強度、成形性、および耐食性に優れるアルミニウム合金フィン材は、質量％で、Ｍｎ：１．２〜２．０％、Ｓｉ：０．５〜１．３％、Ｃｕ：０．０５〜０．１３％、Ｆｅ：０．１〜０．５％、Ｚｎ：０．５〜３．０％を含有し、残部がＡｌと不可避不純物からなる組成を有するアルミニウム合金からなり、コルゲート成形前のフィン材表面で、円相当径で５００μｍ以上の結晶粒が１０〜２００個／ｃｍ２存在し、その９０％以上が幅方向よりも圧延方向に長い組織を有し、引張強さが２００〜２５０ＭＰａ、伸びが１．０〜５．０％であり、６００℃で３分間保持するろう付相当熱処理後に引張強さが１４０ＭＰａ以上で、中性塩水噴霧試験で１６週間後の腐食減量が１５０ｍｇ／ｄｍ２以下である。【選択図】図１