Steel sheet for container and method for producing steel sheet for container
A steel sheet for a container includes: a steel sheet; a coated layer containing Ni provided as an upper layer of the steel sheet; and a chemical treatment layer as an upper layer of the coated layer, and containing a Zr compound in an amount of 3.0 to 30.0 mg/m 2 in terms of Zr metal, and a Mg compound in an amount of 0.50 to 5.00 mg/m 2 in terms of Mg metal, in which the coated layer is one of: a Ni coated layer which contains Ni in amount of 10 to 1000 mg/m 2 in terms of Ni metal, and a composite coated layer which contains Ni in an amount of 5 to 150 mg/m 2 in terms of Ni metal and Sn in an amount of 300 to 3000 mg/m 2 in terms of Sn metal, and has an island-shaped Sn coated layer formed on an Fe—Ni—Sn alloy layer.
1. A steel sheet for a container, comprising:
a steel sheet;
a coated layer which contains Ni and is provided as an upper layer of the steel sheet; and
a chemical treatment layer which is provided as an upper layer of the coated layer, and consists of
(a) a Zr compound in an amount of 3.0 to 30.0 mg/m 2 in terms of Zr metal,
(b) a Mg compound in an amount of 0.50 to 5.00 mg/m 2 in terms of Mg metal, and
(c) unavoidable impurities, and optionally
(d) one or more selected from the group consisting of phosphoric acid and phosphate in a total amount of 1.5 to 25.0 mg/m 2 in terms of P,
wherein the coated layer is one of the group consisting of
a Ni coated layer which contains Ni in amount of 10 to 1000 mg/m 2 in terms of Ni metal, and
a composite coated layer which contains Ni in an amount of 5 to 150 mg/m 2 in terms of Ni metal and Sn in an amount of 300 to 3000 mg/m 2 in terms of Sn metal, and has an island-shaped Sn coated layer formed on an Fe—Ni—Sn alloy layer.
2. A method for producing a steel sheet for a container, the method comprising:
coating so as to form a coated layer which is one of the group consisting of
a Ni coated layer which contains Ni in amount of 10 to 1000 mg/m 2 in terms of Ni metal, and
a composite coated layer which contains Ni in an amount of 5 to 150 mg/m 2 in terms of Ni metal and Sn in an amount of 300 to 3000 mg/m 2 in terms of Sn metal, and has an island-shaped Sn coated layer and an Fe—Ni—Sn alloy layer formed on the island-shaped Sn coated layer, on a steel sheet;
after the coating, chemical treating so as to form a chemical treatment layer on the coated layer by cathode electrolysis treatment using a chemical treatment solution containing 100 to 3000 ppm of Zr ions, 120 to 4000 ppm of F ions, and 50 to 300 ppm of Mg ions; and
after the chemical treating, main-washing the steel sheet on which the coated layer and the chemical treatment layer are formed, using water at a temperature of 40° C. or higher for 0.5 seconds or longer.
3. The method for producing a steel sheet for a container according to claim 2 ,
wherein the chemical treatment solution further includes 2000 ppm or less of phosphate ions.
4. The method for producing a steel sheet for a container according to claim 3 ,
wherein the chemical treatment solution further includes nitrate ions and ammonium ions having a total amount of 20000 ppm or less.
5. The method for producing a steel sheet for a container according to claim 4 , further comprising:
before the main-washing, preliminary-washing the steel sheet on which the coated layer and the chemical treatment layer are formed, using water at a temperature of 10° C. or more and lower than 40° C. for 0.5 seconds or longer.
6. The method for producing a steel sheet for a container according to claim 3 , further comprising:
before the main-washing, preliminary-washing the steel sheet on which the coated layer and the chemical treatment layer are formed, using water at a temperature of 10° C. or more and lower than 40° C. for 0.5 seconds or longer.
7. The method for producing a steel sheet for a container according to claim 2 ,
wherein the chemical treatment solution further includes nitrate ions and ammonium ions having a total amount of 20000 ppm or less.
8. The method for producing a steel sheet for a container according to claim 7 , further comprising:
before the main-washing, preliminary-washing the steel sheet on which the coated layer and the chemical treatment layer are formed, using water at a temperature of 10° C. or more and lower than 40° C. for 0.5 seconds or longer.
9. The method for producing a steel sheet for a container according to claim 2 , further comprising:
before the main-washing, preliminary-washing the steel sheet on which the coated layer and the chemical treatment layer are formed, using water at a temperature of 10° C. or more and lower than 40° C. for 0.5 seconds or longer.