TOLE D'ACIER REVETUE DE PLUSIEURS COUCHES PRESENTANT UNE BONNE RESISTANCE A LA CORROSION, UNE BONNE APTITUDE A RECEVOIR LA PEINTURE ET UNE BONNE RESISTANCE A LA CORROSION APRES APPLICATION D'UNE COUCHE DE PEINTURE

摘要

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.