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Composite coating steel sheets having good corrosion resistance paintability and corrosion resistance after paint coating

  • US 4,411,964 A
  • Filed: 12/17/1981
  • Issued: 10/25/1983
  • Est. Priority Date: 12/24/1980
  • Status: Expired due to Term
First Claim
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1. A composite coating steel sheet having good corrosion resistance, paintability and corrosion resistance after point coating, which consisting essentially of a plated base steel sheet, a chromate film formed on the surface of the plated base steel sheet and a composite silicate resin film formed on the chromate film and consisting essentially of a colloidal silica, an organic resin and a silane compound.

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