Hot press-formed article

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

Reexamination Certificate

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C428S632000, C428S681000, C428S335000, C428S340000

Reexamination Certificate

active

11254641

ABSTRACT:
A hot press-formed article having improved corrosion resistance and coating adhesion when coated is obtained by hot press forming of a zinc-based plated steel material. It has a zinc-based plating layer comprising an iron-zinc solid solution phase and atop it a zinc oxide layer. The average thickness of the zinc oxide layer which is the outermost layer is at most 2 μm. A hot press-formed article having a good appearance and excellent corrosion resistance, coating adhesion, post-coating corrosion resistance, and weldability has a layer (2) consisting essentially of an iron-zinc solid solution phase atop a base material steel sheet (1). It also has a zinc oxide layer (3) with an average thickness of at most 5 μm as an uppermost layer, but it does not have a substantial amount of an iron-zinc intermetallic compound phase. The total amount of Al contained in the iron-zinc solid solution layer (2) and the zinc oxide layer (3) is at most 0.5 g/m2, and/or the total amount of Al oxides contained in these layers is at most 5 mg/m2.

REFERENCES:
patent: 4707415 (1987-11-01), Ikeda et al.
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patent: 2004-323897 (2004-11-01), None

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