Steel sheet for container use with excellent organic film performance and method of production of same
View Patent ↗Steel sheet for container use with excellent canmaking workability and with excellent drawability and ironability, weldability, corrosion resistance, coating adhesion, film adhesion, and wettability characterized in that a surface of the steel sheet has a Zr film which contains, by amount of metal Zr, 1 to 100 mg/m 2 of Zr oxides.
1. A steel sheet for container use comprising a Zr film directly formed on one or both surfaces of the steel sheet,
wherein the Zr film consists of a Zr oxide and a Zr hydroxide; a Zr oxide, a Zr hydroxide and a Zr phosphate; or a Zr oxide and a Zr phosphate, and
wherein the Zr film has, by amount of metal Zr, 1 to 100 mg/m 2 .
2. The steel sheet for container use as set forth in claim 1 , wherein the Zr film has, by amount of P, 0.1 to 50 mg/m 2 of the Zr phosphate.
3. The steel sheet for container use as set forth in claim 1 or 2 , wherein when coating the steel sheet for container use with an epoxy phenol resin for the purpose of testing, then baking the steel sheet at 200° C. for 30 minutes, next cross-cutting the surface of the steel sheet to a depth reaching the base iron at 1 mm intervals, further treating the steel sheet by retort treatment at 125° C. for 30 minutes, then drying the steel sheet, then attaching and closely adhering adhesive tape to the cross-cuts, then peeling off that adhesive tape, the pieces of the cross-cuts from which the coating was peeled off are less than 5% of the total pieces.
4. The steel sheet for container use as set forth in claim 1 or 2 wherein a surface wetting tension is 31 mN/m or more.
5. A steel sheet for container use comprising a surface-treated layer on one or both surfaces of the steel sheet and a Zr film directly formed on the surface-treated layer,
wherein the surface-treated layer consists of at least one of a metal Sn layer, a metal Ni layer or a Fe—Ni alloy plated layer, and wherein the surface-treated layer has at least one of Ni: 10 to 1000 mg/m 2 or Sn: 100 to 15000 mg/m 2 , and
wherein the Zr film consists of a Zr oxide and a Zr hydroxide; a Zr oxide, a Zr hydroxide and a Zr phosphate; or a Zr oxide and a Zr phosphate, and wherein the Zr film has, by amount of metal Zr, 1 to 100 mg/m 2 .
6. The steel sheet for container use as set forth in claim 5 , wherein the Zr film has, by amount of P, 0.1 to 50 mg/m 2 of the Zr phosphate.
7. The steel sheet for container use as set forth in claim 5 or 6 wherein a surface wetting tension is 31 mN/m or more.
8. The steel sheet for container use as set forth in claim 5 or 6 wherein when coating the steel sheet for container use with an epoxy phenol resin for the purpose of testing, then baking the steel sheet at 200° C. for 30 minutes, next cross-cutting the surface of the steel sheet to a depth reaching the base iron at 1 mm intervals, further treating the steel sheet by retort treatment at 125° C. for 30 minutes, then drying the steel sheet, then attaching and closely adhering adhesive tape to the cross-cuts, then peeling off that adhesive tape, the pieces of the cross-cuts from which the coating was peeled off are less than 5% of the total pieces.
9. A steel sheet for container use comprising a Zr film directly formed on one or both surfaces of the steel sheet,
wherein the Zr film consists of a Zr oxide, a Zr hydroxide and nitrate ions; a Zr oxide, a Zr hydroxide, a Zr phosphate and nitrate ions; or a Zr oxide, a Zr phosphate and nitrate ions,
wherein the Zr film has, by amount of metal Zr, 1 to 100 mg/m 2 , and
wherein after immersing the steel sheet for container use in 1 liter of 70° C. distilled water and stirring for 30 minutes, a concentration of the nitrate ions which are eluted into the solution is 5 mass ppm or less per 1 m 2 of Zr film.
10. The steel sheet for container use as set forth in claim 9 , wherein the Zr film has, by amount of P, 0.1 to 50 mg/m 2 of the Zr phosphate.
11. A steel sheet for container use comprising a surface-treated layer on one or both surfaces of the steel sheet and a Zr film directly formed on the surface-treated layer,
wherein the surface-treated layer consists of at least one of a metal Sn layer, a metal Ni layer or a Fe—Ni alloy plated layer, and wherein the surface-treated layer has at least one of Ni: 10 to 1000 mg/m 2 or Sn: 100 to 15000 mg/m 2 , and
wherein the Zr film consists of a Zr oxide and a Zr hydroxide; a Zr oxide, a Zr hydroxide and a Zr phosphate; or a Zr oxide and a Zr phosphate,
wherein the Zr film has, by amount of metal Zr, 1 to 100 mg/m 2 , and
wherein after immersing the steel sheet for container use in 1 liter of 70° C. distilled water and stirring for 30 minutes, a concentration of nitrate ions which are eluted into the solution is 5 mass ppm or less per 1 m 2 of Zr film.
12. The steel sheet for container use as set forth in claim 11 , wherein the Zr film has, by amount of P, 0.1 to 50 mg/m 2 of the Zr phosphate.