Chromium plating product and method for producing the same

Abstract

According to a chromium plating product including a substrate, a glossy nickel plating layer formed on the substrate, a nickel plating layer containing titanium formed on the glossy nickel plating layer, and a trivalent chromium plating layer formed on the nickel plating layer containing titanium and having a microporous structure, the chromium plating product includes the trivalent chromium plating layer as the exterior, and has high corrosion resistance. Further, the control of a plating solution and plating conditions for obtaining the same is easy.

1 . A chromium plating product, comprising:
 a substrate;   a glossy nickel plating layer formed on the substrate;   a nickel plating layer formed on the glossy nickel plating layer and comprising titanium; and   a trivalent chromium plating layer formed on the nickel plating layer and having a microporous structure.   
     
     
         2 . The chromium plating product according to  claim 1 , wherein the titanium in the nickel plating layer is titanium oxide having an average particle diameter of 0.05 to 1.0 μm. 
     
     
         3 . The chromium plating product according to  claim 1  or  2 , wherein the nickel plating layer has a titanium content of 0.01 to 1.0 mass %. 
     
     
         4 . The chromium plating product according to any one of  claims 1  to  3 , wherein a number per unit area of micropores in the trivalent chromium plating layer is 5,000 to 30,000/cm 2 . 
     
     
         5 . The chromium plating product according to any one of  claims 1  to  4 , wherein a potential difference between the glossy nickel plating layer and the nickel plating layer is 1 mV or more. 
     
     
         6 . The chromium plating product according to any one of  claims 1  to  5 , further comprising:
 a semi-glossy nickel plating layer formed between the substrate and the glossy nickel plating layer, 
 wherein the substrate comprises a resin. 
 
     
     
         7 . The chromium plating product according to any one of  claims 1  to  6 , wherein the trivalent chromium plating layer is black. 
     
     
         8 . The chromium plating product according to any one of  claims 1  to  6 , wherein the trivalent chromium plating layer is white. 
     
     
         9 . A method for producing a chromium plating product, comprising:
 forming a glossy nickel plating layer on a substrate;   forming a nickel plating layer comprising titanium on the glossy nickel plating layer; and   forming a trivalent chromium plating layer having a microporous structure on the nickel plating layer.   
     
     
         10 . The method according to  claim 9 , wherein the titanium in the nickel plating layer is titanium oxide having an average particle diameter of 0.05 to 1.0 μm. 
     
     
         11 . The method according to  claim 9  or  10 , wherein the nickel plating layer containing titanium has a titanium content of 0.01 to 1.0 mass %. 
     
     
         12 . The method according to any one of  claims 9  to  11 , wherein a number per unit area of micropores in the trivalent chromium plating layer is 5,000 to 30,000/cm 2 . 
     
     
         13 . The method according to any one of  claims 9  to  12 , wherein a potential difference between the glossy nickel plating layer and the nickel plating layer is 1 mV or more. 
     
     
         14 . The method according to any one of  claims 9  to  13 , further comprising, prior to the forming of the glossy nickel plating layer on the substrate:
 forming a semi-glossy nickel plating layer on the substrate, 
 wherein in the forming of the glossy nickel plating layer, the glossy nickel plating layer is formed on the semi-glossy nickel plating layer formed on the substrate, and 
 the substrate comprises a resin. 
 
     
     
         15 . The method according to any one of  claims 9  to  14 , wherein a black trivalent chromium plating layer is formed as the trivalent chromium plating layer. 
     
     
         16 . The method according to any one of  claims 9  to  14 , wherein a white trivalent chromium plating layer is formed as the trivalent chromium plating layer. 
     
     
         17 - 21 . (canceled) 
     
     
         22 . The chromium plating product according to  claim 1 , wherein the trivalent chromium plating layer is formed on the nickel plating layer such that the trivalent chromium plating layer contacts the nickel plating layer. 
     
     
         23 . The chromium plating product according to  claim 1 , wherein the trivalent chromium plating layer is formed on the nickel plating layer such that only the nickel plating layer contacts the trivalent chromium plating layer. 
     
     
         24 . The chromium plating product according to  claim 1 , consisting of the substrate, the glossy nickel plating layer, the nickel plating layer, the trivalent chromium plating layer, and optionally a semi-glossy nickel plating layer formed between the substrate and the glossy nickel plating layer. 
     
     
         25 . The chromium plating product according to  claim 1 , wherein the titanium in the nickel plating layer is titanium oxide having an average particle diameter of 0.05 to 1.0 μm, and a number per unit area of micropores in the trivalent chromium plating layer is 5,000 to 30,000/cm 2 . 
     
     
         26 . The chromium plating product according to  claim 1 , wherein the trivalent chromium plating layer is formed as an outermost layer of the chromium plating product.