Surface-treated steel sheet for fuel tanks
    1.
    发明授权
    Surface-treated steel sheet for fuel tanks 失效
    燃油箱表面处理钢板

    公开(公告)号:US5932359A

    公开(公告)日:1999-08-03

    申请号:US687520

    申请日:1996-11-04

    摘要: A surface-treated steel sheet for fuel tanks comprising a Zn--X alloy plating layer + a chromate film, in which the Zn--X alloy plating layer has an X content for the plating metal as a whole of Ni: 9-18 wt %, Co: 0.02-3 wt %, Mn: 25-45 wt %, or Cr: 8-20 wt %, the amount of deposition of the plating layer is 5-40 g/m.sup.2 and the amount of the chromate film is 10-200 mg/m.sup.2 on a metallic Cr basis, the Zn--X alloy plating layer corresponding to at least the inner surface of a tank has: (1) cracks in the surface layer, with the density of the cracks being 1000-150000 in terms of the number of plated regions surrounded by cracks in a visual field of 1 mm.times.1 mm, and the maximum width of the cracks is not more than 0.5 .mu.m, or (2) an X/(X+Zn) atomic percentage (X.sub.2) determined by surface analysis based on ESCA with X.sub.1 .noteq.X.sub.2 (wherein X.sub.1 =average value of the X content of the plating metal as a whole), and with X.sub.2 being Ni: 5-25 at %, Co: 0.009-10 at %, Mn: 15-65 at % or Cr: 5-25 at %.

    摘要翻译: PCT No.PCT / JP95 / 02516 Sec。 371日期:1996年11月4日 102(e)日期1996年11月4日PCT提交1995年12月8日PCT公布。 公开号WO96 / 17979 日期1996年6月13日,一种用于燃料箱的表面处理钢板,包括Zn-X合金镀层+铬酸盐膜,其中Zn-X合金镀层的电镀金属的X含量为Ni: 9-18重量%,Co:0.02-3重量%,Mn:25-45重量%或Cr:8-20重量%,镀层的沉积量为5-40克/平方米, 铬酸盐膜在金属Cr基上为10-200mg / m 2,至少对应于罐内表面的Zn-X合金镀层具有:(1)表层裂纹,裂纹密度 以1mm×1mm的视野围绕的电镀区域的数量为1000-150000,裂纹的最大宽度不大于0.5μm,或者(2)X /(X + Zn )原子百分比(X2)通过基于ESCA的X1 NOTEQUAL X2(其中X1 =整个电镀金属的X含量的平均值),X2为Ni:5-25at%,Co: 0.009-10at%,Mn:15-65at%或Cr:5-2 5 at%。