| 摘要 |
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/dM2; 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 degrees C.-30 degrees 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. |
