C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24
C25D 3/56 (2006.01) C23F 11/00 (2006.01) C25D 3/22 (2006.01) C25D 7/06 (2006.01)
Patent
CA 1253450
ABSTRACT OF THE DISCLOSURE Composite plated steel strips comprising a zinc base layer electrodeposited on at least one surface of a steel strip exhibit excellent corrosion resistance with or without painting provided that the zinc base layer contains 0.1 to 10% by weight of cobalt, 0.05 to 5% by weight of chromium, 0.05 to 8% by weight of aluminum, and optionally, 0.05 to 5% by weight of Si, the balance being zinc. Such composite plated steel strips are prepared by subjecting a steel strip to composite electroplating in an acidic zinc plating bath which contains at least one water-soluble compound of Co2+ in an amount of 0.3 to 60 g/l of metallic cobalt, at least one water-soluble compound of Cr3+ in an amount of 0.2 to 2.5 g/l of metallic chromium, a pseudo-boehmite like alumina sol in an amount of 0.5 to 20 g/l of alumina, and optionally, colloidal silica in an amount of 0.5 to 20 g/l at pH 1 or higher and a current density of at least 40 A/dm2.
483455
Ichida Toshio
Kimura Hajime
Umino Shigeru
Yamato Koji
Kawasaki Steel Corporation
Moffat & Co.
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