Plated steel sheet

Patent metadata

Field	Value
Publication number	US-10041175-B2
Application number	US-201515127821-A
Country	US
Kind code	B2
Filing date	Apr 8, 2015
Priority date	Apr 8, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A plated steel sheet (1) includes: a steel sheet (2); a pre-plating layer (3) on at least one surface of the steel sheet (2), the pre-plating layer (3) containing Al, Cu, In, Zn, Sn, or Sb, or any combination thereof; and a plating layer (4) of a Zn—Ni alloy on the pre-plating layer (3), a Ni content of the Zn—Ni alloy being 5 mass % to 15 mass %. A coating weight of the pre-plating layer (3) is 0.5 g/m2 or more, and a coating weight of the plating layer (4) is 5 g/m2 or more.

First claim

The invention claimed is:

1. A plated steel sheet, comprising:
a steel sheet;
a pre-plating layer on at least one surface of the steel sheet; and
a plating layer of a Zn—Ni alloy on the pre-plating layer, a Ni content of the Zn—Ni alloy being 5 mass % to 15 mass %, wherein
the pre-plating layer consists of In, Sb, or Sn—Sb—In alloy, and 10 mass % or less of a total amount of Cr, Mo, Nb, Fe, Co, Mn, and Ni,
a coating weight of the pre-plating layer is 0.5 g/m 2 or more, and
a coating weight of the plating layer is 5 g/m 2 or more.

2. The plated steel sheet according to claim 1 , further comprising a chromate-free film of 10 mg/m 2 or more on the plating layer.

3. The plated steel sheet according to claim 2 , wherein the chromate-free film contains a fluoro compound of hexafluorotitanic acid or hexafluorozirconic acid or both of them, phosphoric acid, and a vanadium compound.

4. The plated steel sheet according to claim 2 , wherein the chromate-free film is formed by using a treatment solution containing a salt of Zr or Ti or both of them, or a treatment solution containing a silane coupling agent.

5. The plated steel sheet according to claim 4 , wherein the chromate-free film is formed by using the treatment solution containing a silane coupling agent and the silane coupling agent contains a first silane coupling agent containing a single amino group in a molecule and a second silane coupling agent containing a single glycidyl group in a molecule.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Kurosaki Masao
• Yamaguchi Shinichi

Classifications

• C25D3/565

  containing more than 50% by weight of zinc · CPC title

• C23C28/30

  Coatings combining at least one metallic layer and at least one inorganic non-metallic layer · CPC title

• Y10T428/12972

  Containing 0.01-1.7% carbon [i.e., steel] · CPC title

• C23C28/021

  including at least one metal alloy layer · CPC title

• C23C28/02

  only coatings {only including layers} of metallic material · CPC title