Electroplating bath, method for manufacturing plated product, and plated product

Abstract

An electroplating bath is configured to precipitate a black trivalent chromium layer onto an object to be plated. The electroplating bath includes a nanodiamond and a thiocyanate ion as color enhancers.

What is claimed is: 
     
         1 . An electroplating bath for precipitating a black trivalent chromium layer onto an object to be plated,
 the electroplating bath comprising a nanodiamond and a thiocyanate ion as color enhancers.   
     
     
         2 . The electroplating bath according to  claim 1 , wherein a concentration of the nanodiamond is 0.02 to 0.16 g/L. 
     
     
         3 . A method for manufacturing a plated product having a black trivalent chromium plating film, comprising:
 forming a black trivalent chromium plating film onto an object to be plated by electroplating using the electroplating bath according to  claim 1 ; and   applying a chromate treatment onto the black trivalent chromium plating film.   
     
     
         4 . A plated product having a black trivalent chromium plating film in which nanodiamond particles are dispersed, wherein a b* value of a surface of the plated product is four or less. 
     
     
         5 . The plated product according to  claim 4 , wherein an L* value of the surface of the plated product is fifty or less.