Coated steel sheets and process for producing the same

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly alloy coating

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205245, C25D 356

Patent

active

052425720

ABSTRACT:
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 Cr.sup.6+ ions/Cr.sup.3+ ions being not more than 0.1.

REFERENCES:
patent: 3985584 (1976-10-01), Chan et al.
patent: 4561952 (1985-12-01), Mels et al.
patent: 4707415 (1987-11-01), Ikeda et al.
patent: 4756975 (1988-07-01), Fujii
Chemical Abstracts 101: 119424k.

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