Zinc or zinc alloy electroplating method and system

Abstract

The present invention provides a zinc or zinc alloy electroplating method comprising: performing energizing in an alkaline zinc or zinc alloy electroplating bath provided with a cathode and an anode, wherein the anode is an anode in which a conductive substrate is coated in a conductive state with alkali-resistant ceramics, the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc plating bath containing an organic compound additive or an alkaline zinc alloy electroplating bath containing an amine chelating agent or an organic compound additive, oxidation decomposition, on a surface of the anode caused by the energizing, of the organic compound additive in the alkaline zinc plating bath or the amine chelating agent and the organic compound additive in the alkaline zinc alloy electroplating bath is suppressed as compared with a case of using as an anode the same conductive substrate uncoated with the alkali-resistant ceramics.

What is claimed is: 
     
         1 . A zinc or zinc alloy electroplating method comprising:
 performing energizing in an alkaline zinc or zinc alloy electroplating bath provided with a cathode and an anode, wherein   the anode is an anode in which a conductive substrate is coated in a conductive state with alkali-resistant ceramics,   the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc plating bath containing an organic compound additive or an alkaline zinc alloy electroplating bath containing an amine chelating agent or an organic compound additive,   oxidation decomposition, on a surface of the anode caused by the energizing, of the organic compound additive in the alkaline zinc plating bath or the amine chelating agent and the organic compound additive in the alkaline zinc alloy electroplating bath is suppressed as compared with a case of using as an anode of the same conductive substrate uncoated with the alkali-resistant ceramics.   
     
     
         2 . The zinc or zinc alloy electroplating method according to  claim 1 , wherein
 the anode in which a conductive substrate is coated in a conductive state with alkali-resistant ceramics consists of a conductive substrate and an alkali-resistant ceramics coating.   
     
     
         3 . The zinc or zinc alloy electroplating method according to  claim 1 , wherein
 the conductive substrate contains at least one of nickel and iron.   
     
     
         4 . The zinc or zinc alloy electroplating method according to  claim 1 , wherein
 the alkali-resistant ceramics contain at least one selected from the group consisting of tantalum oxide, aluminum oxide, tantalum nitride, aluminum nitride, silicon nitride, boron nitride, silicon carbide, and boron carbide.   
     
     
         5 . The zinc or zinc alloy electroplating method according to  claim 1 , wherein
 the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc electroplating bath at least containing zinc ions, caustic alkali, and an organic compound additive.   
     
     
         6 . The zinc or zinc alloy electroplating method according to  claim 1 , wherein
 the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc alloy electroplating bath at least containing zinc ions, metal ions, caustic alkali, an amine chelating agent, and an organic compound additive, and   the metal ions include at least one selected from the group consisting of nickel ions, iron ions, cobalt ions, tin ions, and manganese ions.   
     
     
         7 . The zinc or zinc alloy electroplating method according to  claim 6 , wherein
 the amine chelating agent contains at least one selected from the group consisting of alkylene amine compounds, alkylene oxide adducts thereof, and alkanolamine compounds.   
     
     
         8 . A zinc or zinc alloy electroplating system comprising:
 an alkaline zinc or zinc alloy electroplating bath provided with a cathode and an anode, wherein   the anode is an anode in which a conductive substrate is coated in a conductive state with alkali-resistant ceramics,   the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc plating bath containing an organic compound additive or an alkaline zinc alloy electroplating bath containing an amine chelating agent or an organic compound additive,   oxidation decomposition, on a surface of the anode caused by the energizing, of the organic compound additive in the alkaline zinc plating bath or the amine chelating agent and the organic compound additive in the alkaline zinc alloy electroplating bath is suppressed as compared with a case of using as an anode of the same conductive substrate uncoated with the alkali-resistant ceramics.   
     
     
         9 . The zinc or zinc alloy electroplating system according to  claim 8 , wherein
 the anode in which a conductive substrate is coated in a conductive state with alkali-resistant ceramics consists of a conductive substrate and an alkali-resistant ceramics coating.   
     
     
         10 . The zinc or zinc alloy electroplating system according to  claim 8 , wherein
 the conductive substrate contains at least one of nickel and iron.   
     
     
         11 . The zinc or zinc alloy electroplating system according to  claim 8 , wherein
 the alkali-resistant ceramics contain at least one selected from the group consisting of tantalum oxide, aluminum oxide, tantalum nitride, aluminum nitride, silicon nitride, boron nitride, silicon carbide, and boron carbide.   
     
     
         12 . The zinc or zinc alloy electroplating system according to  claim 8 , wherein
 the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc electroplating bath at least containing zinc ions, caustic alkali, and an organic compound additive.   
     
     
         13 . The zinc or zinc alloy electroplating system according to  claim 8 , wherein
 the alkaline zinc or zinc alloy electroplating bath is an alkaline zinc alloy electroplating bath at least containing zinc ions, metal ions, caustic alkali, an amine chelating agent, and an organic compound additive, and   the metal ions include at least one selected from the group consisting of nickel ions, iron ions, cobalt ions, tin ions, and manganese ions.   
     
     
         14 . The zinc or zinc alloy electroplating system according to  claim 13 , wherein
 the amine chelating agent contains at least one selected from the group consisting of alkylene amine compounds, alkylene oxide adducts thereof, and alkanolamine compounds.