Steel product with an anticorrosive coating of aluminum alloy and method for the production thereof

Patent metadata

Field	Value
Publication number	US-10287440-B2
Application number	US-201515326407-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Jul 16, 2014
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A steel product may include a metallic anticorrosion coating of an aluminum alloy. So that such a steel product possesses high media resistance, more particularly high acid resistance and corrosion resistance, the steel product may be immersed in a liquid-melt coating bath that includes an aluminum alloy. In addition to Aluminum and unavoidable impurities, the aluminum alloy may include at least one of 0.2-2% by weight Mn or 0.2-7% by weight Mg, 0.5-5% by weight Fe, and at least one of 0.05-0.4% by weight Ti or 0.05-0.4% by weight Zr. A method for producing such steel products may involve providing a steel product in a hot-rolled or cold-rolled state, activating a surface of the steel product to remove passive oxides, and coating the surface-activated steel product by immersion in a liquid-melt coating bath that comprises an aluminum alloy having the aforementioned composition.

First claim

What is claimed is:

1. A steel product having a metallic anticorrosion coating of an aluminum alloy, wherein in addition to aluminum and unavoidable impurities the aluminum alloy comprises:
1.5-2% by weight Mn;
1.5-3% by weight Fe;
at least one of 0.05-0.4% by weight Ti or 0.05-0.4% by weight Zr; and
optionally, 0.2-7% by weight Mg.

2. The steel product of claim 1 wherein the aluminum alloy further comprises at least one of
0.1-15% by weight Si;
0.05-2% by weight Ni;
0.05-0.4% by weight Sb;
0.05-0.4% by weight Cr;
at most 0.4% by weight Co;
at most 0.1% by weight Cu; or
at most 0.1% by weight Zn.

3. The steel product of claim 1 wherein the aluminum alloy includes both Mn and Mg, with the aluminum alloy including 0.2-0.6% by weight Mg.

Assignees

• Thyssenkrupp Steel Europe Ag
• Thyssenkrupp Ag

Inventors

• Blumenau Marc
• Moll Oliver
• Peters Michael
• Wuttke Thiemo

Classifications

• C23C2/12 Primary

  Aluminium or alloys based thereon · CPC title

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• C09D5/08 Primary

  Anti-corrosive paints · CPC title

• C09D1/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title