Volkswagen Ag

Salzgitter Flachstahl Gmbh

Jan-Frederik Lass

Friedrich Luther

Marc Debeaux

Matthias Graul

Thomas Koll

Haucke-Frederik Hartmann

Stefan Mütze

Frank Beier

Christian Fritzsche

Stefan MÜTZE

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 [&#x3bc;m]&#x3c;(1/35)&#xd7;application on both sides [g/m]+(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 &#x3bc;m, 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 &#x3bc;m to at most 5 &#x3bc;m.

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

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&#xb0; C., advantageously at least 95&#xb0; C., and/or steam treatment at temperatures of at least 90&#xb0; C., advantageously at least 95&#xb0; 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.

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

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Wolfsburg, Germany

Jan-Frederik Lass