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

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/m2 of Ni in terms of an amount of metal Ni and an Sn coated layer that contains 0.1 to 10 g/m2 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/dm2 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.