Coated steel sheets and process for producing the same

Details Coated steel sheets and process for producing the same Coated steel sheets and process for producing the same

C - Chemistry, Metallurgy

25

D

117/142, 204/15,

C25D 3/22 (2006.01) C25D 3/04 (2006.01) C25D 3/56 (2006.01) C25D 5/10 (2006.01) C25D 7/06 (2006.01) C25D 11/38 (2006.01) C25D 15/02 (2006.01)

Patent

CA 1337555

Disclosed are electro-plated steel sheets having a primer coating composed of 5 to 30 % by weight of Cr, 0.005 to 5 % by weight of cation polymer, with the balance being Zn, with or without a further Zn or Zn-alloy coating formed on the primer coating. The primer coating may contain fine particles of oxides and/or iron-group metals, and may further be applied with a chromate film and/or an organic coating. Also disclosed is the process for producing an electro-plated steel sheet having excellent corrosion resistance and surface brightness, comprising performing electro-plating in an acidic Zn plating bath containing Cr ions and cation polymer, with the ratio of Cr6+ ions/Cr3+ ions being not more than 0.1.

599581

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