Zinc-silica composite electroplated steel sheet excellent in...

Details Zinc-silica composite electroplated steel sheet excellent in... Zinc-silica composite electroplated steel sheet excellent in...

C - Chemistry, Metallurgy

25

D

117/231, 204/24

C25D 15/00 (2006.01) B32B 15/18 (2006.01) C25D 5/10 (2006.01) C25D 15/02 (2006.01)

Patent

CA 2037087

ZINC-SILICA COMPOSITE ELECTROPLATED STEEL SHEET EXCELLENT IN CORROSION RESISTANCE AND SPOT WELDABILITY ABSTRACT OF THE DISCLOSURE A zinc-silica composite electroplated steel sheet excellent in corrosion resistance and spot weldability, which comprises: a steel sheet; a first zinc-silica composite plating layer, formed on at least one surface of the steel sheet, in which silica particles are uniformly dispersed; and a second zinc-silica composite plating layer, formed on the first zinc-silica composite plating layer, in which silica particles are uniformly dispersed. The first zinc-silica composite plating layer has a content of silica particles within a range of from 0.1 to 20.0 wt.% relative to the first zinc-silica composite plating layer; the silica particles in the first zinc-silica composite plating layer have an average particle size within a range of from 20 nm to 1.0 µm; and the first zinc-silica composite plating layer has a weight within a range of from over 10 g/m2 to up to 90 g/m2 per surface of the steel sheet. The second zinc- silica composite plating layer has a content of silica particles within a range of from 1 to 20 wt.% relative to the second zinc-silica composite plating layer; the silica particles in the second zinc-silica composite plating layer have an average particle size of under 20 nm; and the second zinc-silica composite plating layer has a weight within a range of from 5 to 10 g/m2 per surface of the steel sheet.

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