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

Patent metadata

Field	Value
Publication number	US-10294577-B2
Application number	US-201515320404-A
Country	US
Kind code	B2
Filing date	Oct 8, 2015
Priority date	Oct 9, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

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/m 2 of Ni in terms of an amount of metal Ni and 0.1 to 10 g/m 2 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/m 2 of Zr compounds in terms of an amount of metal Zr and 0.01 to 5 mg/m 2 of phosphate compounds in terms of an amount of P.

First claim

What is claimed is:

1. A chemical treatment steel sheet comprising:
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/m 2 of Ni in terms of an amount of metal Ni and 0.1 to 10 g/m 2 of Sn in terms of an amount of metal Sn, and in which an island-shaped Sn coated layer is formed on a Fe—Ni—Sn alloy layer; and
a chemical treatment layer that is formed on the composite coated layer, and consists of 0.01 to 0.06 mg/m 2 of Zr compounds in terms of an amount of metal Zr, 0.01 to 5 mg/m 2 of phosphate compounds in terms of an amount of P, and unavoidable impurities, wherein
a surface of the chemical treatment layer is covered with neither a film nor a coating.

2. The chemical treatment steel sheet according to claim 1 ,
wherein the chemical treatment layer contains 0.02 to 0.06 mg/m 2 of the Zr compounds in terms of the amount of metal Zr.

3. The chemical treatment steel sheet according to claim 1 ,
wherein the chemical treatment layer contains 0.01 to 4 mg/m 2 of the phosphate compounds in terms of the amount of P.

4. The chemical treatment steel sheet according to claim 1 ,
wherein the chemical treatment layer contains 0.01 mg/m 2 to less than 1 mg/m 2 of the phosphate compounds in terms of the amount of P.

5. The chemical treatment steel sheet according to claim 1 ,
wherein the chemical treatment layer contains 0.03 to 5 mg/m 2 of the phosphate compounds in terms of the amount of P.

6. The chemical treatment steel sheet according to claim 1 ,
wherein when a variation amount in a yellowness index before and after storage for 4 weeks in an environment of a temperature of 40° C. and a humidity of 80% at one measurement point on an outermost surface of the chemical treatment layer is defined as ΔYI, an average value of the ΔYI obtained at the measurement points included in a unit area of the outermost surface is less than 1.7.

7. The chemical treatment steel sheet according to claim 1 ,
wherein the composite coated layer contains 2 to 180 mg/m 2 of Ni in terms of the amount of metal Ni, and 0.2 to 8 g/m 2 of Sn in terms of the amount of metal Sn.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Tani Yoshiaki
• Hirano Shigeru
• Tachiki Akira
• Yanagihara Morio
• Kawabata Makoto
• Yokoya Hirokazu

Classifications

• C25D9/08

  by cathodic processes · CPC title

• C23C10/60

  After-treatment · CPC title

• Y10T428/24917

  including metal layer · CPC title

• C25D5/48

  After-treatment of electroplated surfaces · CPC title

• C23C28/321

  with at least one metal alloy layer · CPC title