Method for producing composite plated product

Abstract

There is provided a method for producing a composite plated product wherein a coating of a composite material containing carbon particles in a silver layer is formed on a substrate by using a composite plating solution wherein carbon particles treated by an oxidation treatment and a silver matrix orientation adjusting agent are added to a silver plating solution, the method being capable of preventing the wear resistance of the composite plated product from being deteriorated even if the current density in a plating process is increased. The molar ratio of silver to free cyanogen in the composite plating solution is adjusted so as not to be less than 0.7, preferably so as to be in the range of from 0.7 to 1.3. The silver matrix orientation adjusting agent contains selenium ions, and is preferably potassium selenocyanate. The concentration of the silver matrix orientation adjusting agent in the composite plating solution is adjusted so as to be in the range of from 5 mg/l to 20 mg/l.

1 . A method for producing a composite plated product, the method comprising the steps of:
 preparing carbon particles and a silver matrix orientation adjusting agent which is an agent for adjusting the orientation of a silver matrix;   treating said carbon particles by an oxidation treatment;   adding the treated carbon particles and said silver matrix orientation adjusting agent to a silver plating solution to form a composite plating solution which contains the treated carbon particles and the silver matrix orientation adjusting agent; and   electroplating a substrate in said composite plating solution to form a coating of a composite material, which contains the treated carbon particles in a silver layer, on the substrate,   wherein the molar ratio of silver to free cyanogen in said composite plating solution is adjusted so as not to be less than 0.7.   
   
   
       2 . A method for producing a composite plated product as set forth in  claim 1 , wherein said molar ratio of silver to free cyanogen in said composite plating solution is adjusted so as to be in the range of from 0.7 to 1.3. 
   
   
       3 . A method for producing a composite plated product as set forth in  claim 1 , wherein said silver matrix orientation adjusting agent contains selenium ions. 
   
   
       4 . A method for producing a composite plated product as set forth in  claim 1 , wherein said silver matrix orientation adjusting agent is potassium selenocyanate. 
   
   
       5 . A method for producing a composite plated product as set forth in  claim 3 , wherein the concentration of said silver matrix orientation adjusting agent in said composite plating solution is adjusted so as to be in the range of from 5 mg/l to 20 mg/l. 
   
   
       6 . A method for producing a composite plated product as set forth in  claim 1 , wherein said coating is formed by electroplating the substrate at a current density of 1 to 3 A/dm 2 . 
   
   
       7 . A composite plating solution comprising:
 a silver plating solution for plating a substrate with silver;   carbon particles treated by an oxidation treatment to be added to the silver plating solution; and   a silver matrix orientation adjusting agent added to the silver plating solution,   wherein the molar ratio of silver to free cyanogen in the composite plating solution is not less than 0.7.