Component made of press-form-hardened, aluminum-based coated steel sheet, and method for producing such a component

US11339479B2 · kind B2 · utility

Assignees

• Salzgitter Flachstahl GmbH · DE
• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Thomas Köll · Telfs, AT
• Marc Debeaux · Braunschweig, DE
• Friedrich Luther · Gehrden, DE
• Christian Fritzsche · Nuremberg, DE
• Stefan Mütze · Hannover, DE
• Frank Beier · Duisburg, DE
• Matthias Graul · Brome, DE
• Jan-Frederik Lass · Wolfsburg, DE
• Haucke-Frederik Hartmann · Herzberg, DE

Key dates

• Filing date: Apr 13, 2017
• Grant date: May 24, 2022
• Expiry date: Feb 22, 2039

Classification

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

Abstract

In a component made of press-form-hardened, aluminium-based coated steel sheet, the coating has a covering which contains aluminum and silicon applied in the hot-dip process. The press-form-hardened component in the transition region between steel sheet and covering has an inter-diffusion zone I, wherein, depending on the layer application of the covering before heating and press hardening, the thickness of the inter-diffusion zone I obeys the following formula: I [μm]<(1/35)×application on both sides [g/m2]+(19/7). Formed on the inter-diffusion zone I is a zone having various intermetallic phases having an average total thickness between 8 and 50 μm, on which zone there is in turn arranged a covering layer containing aluminum oxide and/or hydroxide having an average thickness of at least 0.05 μm to at most 5 μm.