Method for producing press-hardened components consisting of steel sheets or steel strips comprising an aluminium-based coating, and pressed-hardened component therefrom

US10876195B2 · kind B2 · utility

Assignees

• Salzgitter Flachstahl GmbH · DE
• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Thomas Köll · Telfs, AT
• Marc Debeaux · Braunschweig, DE
• Friedrich Luther · Gehrden, DE
• Haucke-Frederik Hartmann · Herzberg, DE
• Jan-Frederik Lass · Wolfsburg, DE
• Matthias Graul · Brome, DE

Key dates

• Filing date: Feb 2, 2017
• Grant date: Dec 29, 2020
• Expiry date: Aug 20, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12757
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

In an aluminium-based coating for steel sheets or steel strips, the coating includes an aluminium-based coat applied in a hot-dip coating method, a covering layer containing aluminium oxide and/or hydroxide being arranged on the coat. The covering layer is produced by plasma oxidation and/or hot water treatment at temperatures of at least 90° C., advantageously at least 95° C., and/or steam treatment at temperatures of at least 90° C., advantageously at least 95° C. Alternatively, the covering layer containing aluminium oxide and/or hydroxide can be produced by anodic oxidation, the coat being produced in a molten bath with a Si content of between 8 and 12 wt. %, and an Fe content of between 1 and 4 wt. %, the remainder being aluminium.