Method of adhering a colored electroplating layer on a zinc-elec

Details Method of adhering a colored electroplating layer on a zinc-elec Method of adhering a colored electroplating layer on a zinc-elec

1992-12-15

1994-01-04

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

205103, 205170, 205178, C25D 510

Patent

active

052757030

ABSTRACT:
A method of adhering a colored electroplating layer on zinc-electroplated steel articles that utilizes an alternating current power supply which supplies electricity of frequency of 10-20 Hz, voltage of 60-120 V, and current density of 20-80 Amp/dM.sup.2 ; and an aqueous electroplating solution which contains 150-200 g/l of silicate, 15-20 g/l of sodium hydroxide and 5-50 g/l of cobalt salt. The electroplating liquid is kept at a constant temperature of 20.degree. C.-30.degree. C. In this method, two stages are utilized to perform the electroplating and adhere a colored electroplated layer so that the surface of the zinc-electroplated layer can adhere a blue electroplated layer. Thus the aesthetics and the corrosion-resistant capability of the zinc-electroplated layer can be enhanced because of the colored electroplated layer adhered to the surface of the zinc-electroplated layer. In this method, the cobalt salts can be replaced by metal salts such as manganese salts of 5-20 g/l, chromium salts of 5-15 g/l, iron salts of 2-15 g/l, and tin salts of 20-40 g/l so that the adhered color of the surface of the zinc-electroplated layer will be of brown, green, white, or grey color, respectively.

REFERENCES:
patent: 4968391 (1990-11-01), Saito et al.

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