Surface treatment method for electroplating conductor roll and electroplating conductor roll

Abstract

[Problem] To limit adhesion of foreign matter stemming from plating liquid, metal stemming from the plated steel sheet and oxides of the metal to the surface of a conductor roll. [Solution] A surface treatment method for surface-treating the roll surface of an electroplating conductor roll characterized in that: the surface treatment liquid is a surface treatment solution in which graphite has been dispersed in a mixed solution made of an aqueous aluminum phosphate solution and colloidal silica; and that the surface treatment liquid, in which concentrations have been adjusted such that when the surface treatment liquid is 100 mass %, the aluminum phosphate content is 3 mass % to 14 mass %, the silica content is 7 mass % to 37 mass %, and the graphite content is at least 4 mass %, is supplied to the roll surface and baked.

1 . A surface treatment method for an electroplating conductor roll, performing a surface treatment of a roll surface of an electroplating conductor roll, the method comprising:
 supplying a surface treatment liquid obtained by dispersing graphite in a mixed solution comprising an aluminum phosphate aqueous solution and colloidal silica to the roll surface, the surface treatment liquid being adjusted in terms of concentration such that a content of aluminum phosphate is 3 mass % or more and 14 mass % or less, a content of silica is 7 mass % or more and 37 mass % or less, and a content of graphite is at least 4 mass % or more when an amount of the surface treatment liquid is 100 mass %; and   baking the roll surface.   
     
     
         2 . The surface treatment method for an electroplating conductor roll according to  claim 1 , wherein
 the electroplating conductor roll includes a roll main body and a thermal spray coating film obtained by thermally spraying a surface of the roll main body, and   the surface treatment liquid is supplied to the thermal spray coating film.   
     
     
         3 . The surface treatment method for an electroplating conductor roll according to  claim 1 , wherein, when the amount of the surface treatment liquid is 100 mass %, the content of graphite is 14 mass % or less. 
     
     
         4 . The surface treatment method for an electroplating conductor roll according to  claim 1 , wherein the aluminum phosphate aqueous solution comprises one kind or two or more kinds of aluminum dihydrogen phosphate, aluminum hydrogen phosphate, monomethyl aluminum phosphate, and an aluminum phosphate ester. 
     
     
         5 . An electroplating conductor roll comprising a foreign material adhesion prevention layer on a surface of the roll, wherein
 the foreign material adhesion prevention layer contains alumina, diphosphorus pentaoxide, silicon dioxide, and graphite,   a content of alumina is 1.5 mass % or more and 6.8 mass % or less, a content of diphosphorus pentaoxide is 6 mass % or more and 27.3 mass % or less, a content of silicon dioxide is 18 mass % or more and 80 mass % or less, and a content of graphite is 10.2 mass % or more and 36 mass % or less when an amount of the foreign material adhesion prevention layer is 100 mass %.   
     
     
         6 . The electroplating conductor roll according to  claim 5 , comprising a roll main body and a thermal spray coating film obtained by thermally spraying a surface of the roll main body, wherein
 the foreign material adhesion prevention layer seals pores of the thermal spray coating film and covers a surface of the thermal splay coating film.