Aluminum plated steel sheet having excellent corrosion resistance with respect to alcohol or mixed gasoline of same and appearance

Patent metadata

Field	Value
Publication number	US-9403343-B2
Application number	US-201114130352-A
Country	US
Kind code	B2
Filing date	Jul 14, 2011
Priority date	Jul 14, 2011
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

The present invention relates to aluminum plated steel sheet which does not require coating after plating and is high in production flexibility enabling application of conventional production processes as they are or exhibits excellent corrosion resistance to flex fuels and further is excellent in appearance and to fuel tanks characterized by being produced using the steel sheet. The Si, Mg, Ca, and Ti ingredients in the aluminum plating layer are defined and the cooling method after hot dip aluminum coating is controlled to make Mg 2 Si particles with a long axis of 10 μm or less and an aspect ratio of 1 to 3 finely disperse in the plating layer. Due to the Mg 2 Si particles, it is possible to give an excellent corrosion resistance to flex fuels and suppress the deterioration in appearance due to MgO.

First claim

The invention claimed is:

1. Aluminum plated steel sheet which is excellent in corrosion resistance and appearance, comprising steel sheet on at least one surface of which there is a plating layer consisting of, by mass %,
Si: 2% to 11%,
Mg: 3% to 9%,
Ca: 0.1% to 5%,
Ti: 0.008% to 0.05%, and
a balance of Al and unavoidable impurities,
said plating layer containing clumps of Mg 2 Si particles with a long axis of greater than 0 μm and 10 μm or less, and a ratio of a long axis and a short axis, an aspect ratio, of 1 to 3,
wherein the long axis and the aspect ratio are measured by examining the vertical cross-section of the plating layer.

2. Aluminum plated steel sheet which is excellent in corrosion resistance and appearance as set forth in claim 1 characterized by having an Al—Si—Fe-based alloy layer of a thickness of greater than 0 μm and 5 μm or less at the interface of said plating layer and said steel sheet.

3. Aluminum plated steel sheet which is excellent in corrosion resistance and appearance as set forth in claim 1 or 2 characterized in that said plating layer has a thickness of 9 to 35 μm.

4. A fuel tank which is excellent in corrosion resistance and appearance characterized by using aluminum plated steel sheet which has a plating layer consisting of, by mass %,
Si: 2% to 11%,
Mg: 3% to 9%,
Ca: 0.1% to 5%,
Ti: 0.008% to 0.05%, and
a balance of Al and unavoidable impurities,
said plating layer containing clumps of Mg 2 Si particles with a long axis of greater than 0 μm and 10 μm or less and a ratio of a long axis and a short axis, an aspect ratio, of 1 to 3,
wherein the long axis and the aspect ratio are measured by examining the vertical cross-section of the plating layer.

Assignees

• Goto Yasuto
• Kurosaki Masao
• Yamaguchi Shinichi
• Maki Jun
• Nippon Steel & Sumitomo Metal Corp

Inventors

• Goto Yasuto
• Kurosaki Masao
• Yamaguchi Shinichi
• Maki Jun

Classifications

• B32B15/012 Primary

  one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy · CPC title

• C23C2/12 Primary

  Aluminium or alloys based thereon · CPC title

• Y10T428/12979

  Containing more than 10% nonferrous elements [e.g., high alloy, stainless] · CPC title

• Y10T428/264

  Up to 3 mils · CPC title

• Y10T428/12757

  Fe · CPC title