Composite coating steel sheets having good corrosion resistance paintability and corrosion resistance after paint coating
First Claim
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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Accused Products
Abstract
A composite coating steel sheet is disclosed which has good corrosion resistance, paintability and corrosion resistance after paint coating. The steel sheet comprises a plated base steel sheet, such as a galvanized, zinc alloy plated or aluminum plated steel sheet, and a chromate film formed on the plated base steel sheet. A composite silicate resin film is formed on the chromate film. The composite silicate film is composed of a reaction product of a colloidal silica, an organic resin and a silane compound.
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Citations
25 Claims
- 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.
Specification