Chemical treatment steel sheet, and method for producing chemical treatment steel sheet

Abstract

Provided is a chemical treatment steel sheet including a steel sheet; a composite coated layer which is formed on at least one surface of the steel sheet, and contains 2 to 200 mg/m2 of Ni in terms of an amount of metal Ni and 0.1 to 10 g/m2 of Sn in terms of an amount of metal Sn, and in which an island-shaped Sn coated layer is formed on an Fe—Ni—Sn alloy layer; and a chemical treatment layer that is formed on the composite coated layer, and contains a 0.01 to 0.1 mg/m2 of Zr compounds in terms of an amount of metal Zr and 0.01 to 5 mg/m2 of phosphate compounds in terms of an amount of P.

What is claimed is: 
     
         1 . A method for producing a chemical treatment steel sheet, comprising:
 a plating process that forms an Ni coated layer that contains 2 to 200 mg/m 2  of Ni in terms of an amount of metal Ni and an Sn coated layer that contains 0.1 to 10 g/m 2  of Sn in terms of an amount of metal Sn on a surface of a steel sheet;   a reflow process that forms an Fe—Ni—Sn alloy layer on the steel sheet and an island-shaped Sn coated layer on the Fe—Ni—Sn alloy layer by performing a reflow treatment with respect to the steel sheet in which the Ni coated layer and the Sn coated layer are formed; and   a chemical treatment process that forms a chemical treatment layer on the island-shaped Sn coated layer by performing an electrolytic treatment in a chemical treatment liquid, which contains equal to or greater than 10 ppm and less than 500 ppm of Zr ions, 10 to 20000 ppm of F ions, 10 to 3000 ppm of phosphate ions, and 100 to 30000 ppm in a total amount of nitrate ions and sulfate ions and of which a temperature is set to equal to or higher than 5° C. and lower than 90° C., under conditions of a current density of 0.5 to 20 A/dm 2  and an electrolytic treatment time of 0.05 to 10 seconds, or by performing an immersion treatment in the chemical treatment liquid for an immersion time of 0.2 to 100 seconds.   
     
     
         2 . The method for producing a chemical treatment steel sheet according to  claim 1 ,
 wherein the chemical treatment liquid contains 100 ppm to less than 500 ppm of Zr ions, 100 to 17000 ppm of F ions, 20 to 2000 ppm of phosphate ions, and 1000 to 20000 ppm in a total amount of nitrate ions and sulfate ions.