Method for manufacturing zinc-silica composite electroplated...

Details Method for manufacturing zinc-silica composite electroplated... Method for manufacturing zinc-silica composite electroplated...

C - Chemistry, Metallurgy

25

D

204/24

C25D 15/00 (2006.01) C25D 3/22 (2006.01) C25D 15/02 (2006.01)

Patent

CA 2036464

METHOD FOR MANUFACTURING ZINC-SILICA COMPOSITE ELECTROPLATED STEEL SHEET ABSTRACT OF THE DISCLOSURE A method for manufacturing a zinc-silica composite electroplated steel sheet, which comprises the steps of: adding, to a zinciferous acidic electroplating solution containing silica particles and nitric acid ions, a complexing agent, which is capable of forming a stable complex with zinc, in an amount within a range of from 0.001 to 10 moles per litre of the electroplating solution, or a pH buffer, which has a pH buffering effect in a solution having a pH value within a range of from 5 to 12, in an amount within a range of from 1 to 50 g per litre of the electroplating solution; and electroplating a steel sheet in the resultant electroplating solution containing the complexing agent of the pH buffer in addition to the silica particles and the nitric acid ions, to form, on the surface of the steel sheet, a zinciferous plating layer in which silica particles are uniformly dispersed.

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