Steel sheet product provided with an anticorrosion coating and process for producing it

US8481172B2 · kind B2 · utility

Assignee

• Thyssenkrupp Steel AG · DE

Inventors

• Wilhelm Warnecke · Hamminkeln, DE
• Manfred Meurer · Rheinberg, DE
• Rudolf Schonenberg · Hemer, DE
• Michael W. Keller · Tulsa, US
• Alexander Elsner · Olpe, DE

Key dates

• Filing date: May 15, 2007
• Grant date: Jul 9, 2013
• Expiry date: Mar 8, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/27
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A flat steel product, and a method for its production, which is formed from a steel substrate, such as strip or sheet steel, and a zinc-based corrosion protection coating, applied to at least one side of the steel substrate, which contains (in wt. %) Mg: 0.25 to 2.5%, Al: 0.2 to 3.0%, Fe: ≦4.0%, and optionally in total up to 0.8% of one or more elements of the group Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn and rare earths, remainder zinc and unavoidable impurities are described. The corrosion protection coating has an Al content of maximum 0.5 wt. % in an intermediate layer extending between a surface layer directly adjacent to the surface of the flat steel product and a border layer adjacent to the steel substrate and with a thickness amounting to at least 20% of the total thickness of the corrosion protection coating.