Steel sheet for containers and manufacturing method for same

Abstract

A manufacturing method for steel sheets for containers produces steel sheets with excellent film adhesion qualities. This steel sheet for containers has, on a steel sheet, a chemical conversion coating with a metal Zr content of 1-100 mg/m 2 , a P content of 0.1-50 mg/m 2 , and an F content of no more than 0.1 mg/m 2 , upon which is formed a phenolic resin layer with a C content of 0.1-50 mg/m 2 . Moreover, the manufacturing method for steel sheets for containers is a method for obtaining the steel sheet for containers wherein the chemical conversion coating is formed on the steel sheet by subjecting the steel sheet to immersion in or electrolytic treatment with a treatment solution containing Zr ions, phosphoric acid ions, and F ions; and subsequently, the steel sheet upon which the chemical conversion coating has been formed is immersed in, or undergoes topical application of, an aqueous solution containing phenolic resin, then dried.

1 . A steel sheet for containers, having a chemical conversion coating formed on the steel sheet and containing 1 to 100 mg/m 2  of zirconium metal, 0.1 to 50 mg/m 2  of phosphorus and up to 0.1 mg/m 2  of fluorine; and having a phenolic resin layer formed on the chemical conversion coating and containing 0.1 to 50 mg/m 2  of carbon. 
     
     
         2 . The steel sheet for containers according to  claim 1 , wherein the steel sheet for containers is obtained by forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet. 
     
     
         3 . The steel sheet for containers according to  claim 1 , wherein the steel sheet has a surface-treatment layer formed on at least one side of the steel sheet and containing 10 to 1,000 mg/m 2  of nickel in terms of nickel metal amount or 100 to 15,000 mg/m 2  of tin in terms of tin metal amount. 
     
     
         4 . The steel sheet for containers according to  claim 1 , wherein a surface of the steel sheet is plated with nickel or an iron-nickel alloy to form a nickel undercoat layer, a tin-plating coating is then provided on the nickel undercoat layer, and part of the tin-plating coating is alloyed with part or all of the nickel undercoat layer by tin melting treatment to form a tin-plating layer containing tin islands,
 wherein the nickel undercoat layer contains 5 to 150 mg/m 2  of nickel in terms of nickel metal amount, and   wherein the tin-plating layer contains 300 to 3,000 mg/m 2  of tin in terms of tin metal amount.   
     
     
         5 . A method of manufacturing a steel sheet for containers for obtaining the steel sheet for containers according to  claim 1 , comprising:
 forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet.   
     
     
         6 . The method of manufacturing a steel sheet for containers according to  claim 5 , wherein a temperature for the drying is 70° C. or more. 
     
     
         7 . The method of manufacturing a steel sheet for containers according to  claim 5 , wherein the drying is followed by washing with water at a temperature of 80° C. or more and redrying. 
     
     
         8 . The steel sheet for containers according to  claim 2 , wherein the steel sheet has a surface-treatment layer formed on at least one side of the steel sheet and containing 10 to 1,000 mg/m 2  of nickel in terms of nickel metal amount or 100 to 15,000 mg/m 2  of tin in terms of tin metal amount. 
     
     
         9 . The steel sheet for containers according to  claim 2 , wherein a surface of the steel sheet is plated with nickel or an iron-nickel alloy to form a nickel undercoat layer, a tin-plating coating is then provided on the nickel undercoat layer, and part of the tin-plating coating is alloyed with part or all of the nickel undercoat layer by tin melting treatment to form a tin-plating layer containing tin islands,
 wherein the nickel undercoat layer contains 5 to 150 mg/m 2  of nickel in terms of nickel metal amount, and   wherein the tin-plating layer contains 300 to 3,000 mg/m 2  of tin in terms of tin metal amount.   
     
     
         10 . A method of manufacturing a steel sheet for containers for obtaining the steel sheet for containers according to  claim 2 , comprising:
 forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet.   
     
     
         11 . A method of manufacturing a steel sheet for containers for obtaining the steel sheet for containers according to  claim 3 , comprising:
 forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet.   
     
     
         12 . A method of manufacturing a steel sheet for containers for obtaining the steel sheet for containers according to  claim 4 , comprising:
 forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet.   
     
     
         13 . A method of manufacturing a steel sheet for containers for obtaining the steel sheet for containers according to  claim 8 , comprising:
 forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet.   
     
     
         14 . A method of manufacturing a steel sheet for containers for obtaining the steel sheet for containers according to  claim 9 , comprising:
 forming the chemical conversion coating on the steel sheet by subjecting the steel sheet to immersion in a treatment solution containing zirconium ions, phosphate ions and fluorine ions or to electrolytic treatment using the treatment solution; then immersing the steel sheet having the chemical conversion coating formed thereon in an aqueous solution containing a phenolic resin or applying the aqueous solution onto the chemical conversion coating; and then drying the steel sheet.