Sumitomo Metal Industries, Inc.

Sumitomo Chemical Company, Limited

Sumitomo Metal Chemical Co., Ltd.

Hiroyuki Nagai

Minoru Nishihara

Toshiaki Shiota

Hiroyuki Kashiwagi

Eiji Kajiyama

Yoshihiro Kawanishi

Shinichi Tsuchiya

Tadayuki Ohmae

Yoshiaki Togawa

Shuji Kitamura

Mitsuyuki Okada

Yoshio Tadokoro

Takuzo Okumura

Toshitsugu Kikuchi

Hiroo Toya

A material which can be improved in its resistance to corrosion caused by alcohol-containing fuels after formation without detriment to weldability and without any substantial cost increase is developed. Constitution A chromate film is applied to a Zn--X alloy electroplating layer, in which X is one or more of Ni: 3-18 wt %, Co: 0.02-3 wt %, Mn: 25-45 wt %, or Cr: 8-20 wt %. The Zn--Ni alloy plating layer underlying the chromate film has cracks with a density of 1000-150000 in terms of the number of plated regions surrounded by cracks in a 1 mm.times.1 mm visual field, with cracks having a maximum width of 0.5 .mu.m or less comprising 90% or more of the total number of the cracks, and with cracks having a depth of 80% or more of the thickness of the plating layer comprising 80% or more of the total number of the cracks.

Surface-treated steel sheet having improved corrosion resistance after

Surface-treated steel sheet for fuel tanks

A vibration-damping material consisting of two metal plates and a vibration-damping layer of thermoplastic resin interposed between the two metal plates, in which said thermoplastic resin has a percentage of wlongation at 20.degree. C. of 30% or more, preferably 50% or more, a peak temperature of dissipation factor (tan .delta.) in the range of -50.degree. C. to 130.degree. C., and a bonding strength toward the metal plates of 3 kg/cm or more as determined by 180.degree.-peeling test at 20.degree. C.

Vibration-damping material

A rigid metal-resin-metal sandwich laminate capable of withstanding 180.degree. bending with a threshold bending inner diameter of less than or equal to twice the total laminate thickness and suitable for use in the manufacture of building materials, containers, and particularly automotive parts including automotive outer panels is disclosed. The laminate comprises a resin layer sandwiched between and bonded to outer metal layers wherein the resin layer is comprised of a core sheet sandwiched between outer resin sheets, said core sheet being made of a resin which exhibits plastic behavior and which is bonded to said outer resin sheets with or without an adhesive layer, and said outer resin sheets being made of a ductile resin which does not exhibit yielding behavior or necking when stretched.

Metal-resin-metal sandwich laminates suitable for use in press forming

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Nishinomiya, Japan

Hiroyuki Nagai