Black plated substrate

Abstract

The present invention relates to a black plated substrate comprising a base-substrate and deposited thereon a layer stack, wherein the layer stack comprises a black chromium plating layer comprising on its surface a conversion layer having a depth of 30 nm or more, characterized in that the conversion layer does not comprise metallic chromium or comprises metallic chromium only up to 2 at.-%, based on the element chromium and the total number of chromium atoms in the conversion layer.

1 . A black plated substrate comprising a base-substrate and deposited thereon a layer stack, wherein the layer stack comprises
 (a) one or more than one intermediate plating layer formed on the base-substrate; and   (b) a black chromium plating layer formed on the one or more than one intermediate plating layer;   wherein
 the black chromium plating layer
 has, according to the L*a*b color system, a L* value of 55 or less; 
 comprises the elements chromium, carbon, and oxygen; 
 comprises on its surface a conversion layer having a depth of 30 nm or more measured from the surface towards the one or more than one intermediate plating layer; and 
 has a total thickness of 100 nm or more, including said conversion layer; 
 
   characterized in that the conversion layer does not comprise metallic chromium or comprises metallic chromium only up to 2 at.-%, based on the element chromium and the total number of chromium atoms in the conversion layer.   
     
     
         2 . The black plated substrate of  claim 1 , wherein the base-substrate is a metallic or non-metallic base-substrate. 
     
     
         3 . The black plated substrate of  claim 1 , wherein the one or more than one intermediate plating layer comprises one or more than one selected from the group consisting of a nickel layer, a nickel alloy layer, a copper layer, and a copper alloy layer. 
     
     
         4 . The black plated substrate of  claim 1 , wherein the black chromium plating layer has a L* value of 53 or less. 
     
     
         5 . The black plated substrate of  claim 1 , wherein the black chromium plating layer has, according to the L*a*b color system, a b* value of +7 or less. 
     
     
         6 . The black plated substrate of  claim 1 , wherein the black chromium plating layer comprises chromium in a total amount ranging from 20 at.-% to 70 at.-%, based on the total amount of atoms in the black chromium plating layer including the conversion layer. 
     
     
         7 . The black plated substrate of  claim 1 , wherein the black chromium plating layer comprises carbon in a total amount ranging from 5 at.-% to 40 at.-%, based on the total amount of atoms in the black chromium plating layer including the conversion layer. 
     
     
         8 . The black plated substrate of  claim 1 , wherein the black chromium plating layer comprises oxygen in a total amount ranging from 12 at.-% to 40 at.-%, based on the total amount of atoms in the black chromium plating layer including the conversion layer. 
     
     
         9 . The black plated substrate of  claim 1 , wherein the black chromium plating layer comprises iron. 
     
     
         10 . The black plated substrate of  claim 1 , wherein the conversion layer has a depth of 32 nm or more. 
     
     
         11 . The black plated substrate of  claim 1 , wherein the conversion layer has a maximum depth of 90 nm or less. 
     
     
         12 . The black plated substrate of  claim 1 , wherein the black chromium plating layer has a total thickness of 130 nm or more, including said conversion layer. 
     
     
         13 . The black plated substrate of  claim 1 , wherein the conversion layer does not comprise metallic chromium or comprises metallic chromium only up to 1.7 at.-%, based on the element chromium and the total number of chromium atoms in the conversion layer. 
     
     
         14 . The black plated substrate of  claim 1 , wherein the conversion layer comprises chromium in the form of chromium hydroxide. 
     
     
         15 . The black plated substrate of  claim 1 , wherein in the conversion layer the atomic ratio of the element chromium to the element oxygen is less than 1 and/or in the black chromium plating layer without the conversion layer the atomic ratio of the element chromium to the element oxygen is more than 1.