Chemical treatment steel sheet and method for manufacturing chemical treatment steel sheet

Abstract

A chemical treatment steel sheet includes a steel sheet, an Fe—Sn alloy layer which is formed on at least one surface of the steel sheet, a Sn layer which is formed on the Fe—Sn alloy layer and contains Sn in which a total amount of Sn contained in the Fe—Sn alloy layer and the Sn layer is 0.10 to 30.0 g/m2, and a chemical treatment layer which is formed on the Sn layer and contains a Zr compound in which an amount of Zr contained therein is 1.0 to 150 mg/m2, a phosphate compound in an amount of P contained therein is 1.0 to 100 mg/m2 and an Al compound in an amount of Al contained therein is 0.10 to 30.0 mg/m2.

1 . A chemical treatment steel sheet comprising:
 a steel sheet;   an Fe—Sn alloy layer which is formed on at least one surface of the steel sheet;   a Sn layer which is formed on the Fe—Sn alloy layer and contains Sn in which a total amount of Sn contained in the Fe—Sn alloy layer and the Sn layer is 0.10 to 30.0 g/m 2 ; and   a chemical treatment layer which is formed on the Sn layer and contains a Zr compound in which an amount of Zr contained therein is 1.0 to 150 mg/m 2 , a phosphate compound in which an amount of P contained therein is 1.0 to 100 mg/m 2 , and an Al compound in which an amount of Al contained therein is 0.10 to 30.0 mg/m 2 .   
     
     
         2 . The chemical treatment steel sheet according to  claim 1 ,
 wherein the chemical treatment layer contains Al 2 O 3  in which an amount of Al contained therein is 0.10 to 30.0 mg/m 2 .   
     
     
         3 . The chemical treatment steel sheet according to  claim 1 ,
 wherein the chemical treatment layer contains   the Zr compound in which an amount of Zr contained therein is 1.0 to 120 mg/m 2 ;   the phosphate compound in which an amount of P contained therein is 2.0 to 70.0 mg/m 2 ; and   the Al compound in which an amount of Al contained therein is 0.20 to 20.0 mg/m 2 .   
     
     
         4 . The chemical treatment steel sheet according to  claim 1 ,
 wherein the total amount of Sn contained in the Fe—Sn alloy layer and the Sn layer is 0.30 to 20.0 g/m 2 .   
     
     
         5 . The chemical treatment steel sheet according to  claim 1 ,
 wherein a surface of the chemical treatment layer is not covered with a film or a coating material.   
     
     
         6 . A method for manufacturing a chemical treatment steel sheet, the method comprising:
 a plating process of forming a Sn-plated layer containing Sn in which an amount of Sn contained therein is 0.10 to 30.0 g/m 2  on a surface of a steel sheet;   a reflow treatment process of forming an Fe—Sn alloy layer and a Sn layer by performing reflow treatment on the Sn-plated layer; and   an electrolytic treatment process of forming a chemical treatment layer on the Sn layer by performing an electrolytic treatment under conditions of a current density of 1.0 to 100 A/dm 2  and an electrolytic treatment time of 0.20 to 150 seconds using a chemical treatment solution having a temperature of 5° C. or higher and lower than 90° C.,   wherein the chemical treatment solution contains 10 to 20,000 ppm of Zr ions, 10 to 20,000 ppm of F ions, 10 to 3,000 ppm of phosphate ions, 100 to 30,000 ppm of nitrate ions and sulfate ions in total, and 500 to 5,000 ppm of Al ions, and (NH 4 ) 3 AlF 6  is used as a supply source of Al ions.   
     
     
         7 . The method for manufacturing a chemical treatment steel sheet according to  claim 6 ,
 wherein the chemical treatment solution contains:   200 to 17,000 ppm of the Zr ions;   200 to 17,000 ppm of the F ions;   100 to 2,000 ppm of the phosphate ions;   1000 to 23000 ppm of the nitrate ions and the sulfate ions in total; and   500 to 3000 ppm of the Al ions.