耐食性に優れる錫めっき鋼板

Tinned steel sheet excellent in corrosion resistance

Abstract

【課題】耐食性に優れた錫めっき鋼板、特に、筍、パイナップル、チェリーなどの酸性食品を内容物とする無塗装缶用表面処理鋼板を提供する。 【解決手段】鋼板4の少なくとも製缶後缶内面側に相当する面に、鋼板表面より質量%で、Snが50〜70%、Feが20〜40%、Niが7〜20%である合金層1、その上層にSnが70〜80%、Feが15〜25%、Niが0.1〜7%である合金層2、さらに目付け量で1.5〜15.0g/m 2 の合金化していないSn層3が順次形成され、合金層1、2の中のSn総量が0.2〜2.0g/m 2 でNi総量が0.001〜0.3g/m 2 であることを特徴とする。 【選択図】なし
PROBLEM TO BE SOLVED: To provide a surface-treated tinned steel sheet excellent in corrosion resistance, in particular, suitable for an uncoated can accommodating an acidic food such as bamboo shoot, pineapple and cherry. SOLUTION: The surface-treated steel sheet comprises: an alloy layer 1 on a surface of steel sheet 4 to be an inner wall of can (after being formed into can), wherein the alloy layer 1 contains by mass%, Sn of 50 to 70%, Fe of 20 to 40% and Ni of 7 to 20%; an alloy layer 2 on the alloy layer 1, wherein the alloy layer 2 contains, by mass%, Sn of 70 to 80%, Fe of 15 to 25% and Ni of 0.1 to 7; and an unalloyed Sn plating layer 3 of which the coating weight is 1.5 to 15.0g/m 2 are formed in the named order; wherein a total amount of Sn per unit area in the alloy layers 1 and 2 is 0.2 to 2.0g/m 2 , and a total amount of Ni per unit area in the alloy layers 1 and 2 is 0.001 to 0.3g/m 2 . COPYRIGHT: (C)2007,JPO&INPIT

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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    JP-S63199896-AAugust 18, 1988Nippon Steel CorpProduction of surface treated steel sheet for welded can having superior weldability, adhesion of paint and corrosion resistance after painting
    JP-S63266095-ANovember 02, 1988Nippon Steel CorpSteel sheet for vessel having superior weldability, corrosion resistance and paintability and production thereof
    JP-S6465296-AMarch 10, 1989Nippon Steel CorpVery thin material for welded can having superior seam weldability, corrosion resistance and coatability

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