Electroplated steel sheet having a plurality of coatings,...

Details Electroplated steel sheet having a plurality of coatings,... Electroplated steel sheet having a plurality of coatings,...

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117/158, 204/25.

B32B 15/01 (2006.01) B32B 15/18 (2006.01) C25D 3/56 (2006.01) C25D 5/10 (2006.01) C25D 5/14 (2006.01) C25D 11/38 (2006.01)

Patent

CA 2018196

ELECTROPLATED STEEL SHEET HAVING A PLURALITY OF COATINGS, EXCELLENT IN WORKABILITY, CORROSION RESISTANCE AND WATER-RESISTANT PAINT ADHESIVITY ABSTRACT OF THE DISCLOSURE An electroplated steel sheet having a plurality of coatings, excellent in workability, corrosion resistance and water-resistant paint adhesivity, which comprises: an iron-chromium-zinc alloy coating as a lower layer, having a coating weight of from 0.1 to 40 g/m2 per side, formed on the surface of a steel sheet, consisting essentially of: iron : from 3 to under 15 wt.%, chromium : from 0.1 to 1 wt.%, and the balance being zinc and incidental impurities; another iron-chromium-zinc alloy coating as an intermediate layer, having a coating weight of from 20 to 59.9 g/m2 per side, formed on the iron-chromium-zinc alloy coating as the lower layer, consisting essentially of: iron : from 10 to 40 wt.%, chromium : from over 1 to under 30 wt.%, and the balance being zinc and incidental impurities; and a chromating coating as an upper layer, formed on the another iron-chromium-zinc alloy coating as the intermediate layer, which comprises a metallic chromium film and a hydrated chromium oxide film, each having a coating weight of at least 5 mg/m2 per side.

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