The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 2008
Filed:
Oct. 21, 2005
Yukihiro Yoshikawa, Kyoto, JP;
Kazuhito Imai, Amagasaki, JP;
Kunihiro Fukui, Kawanishi, JP;
Tamotsu Toki, Nishinomiya, JP;
Shuntaro Sudo, Toyota, JP;
Akira Obayashi, Toyota, JP;
Masanobu Ichikawa, Nisshin, JP;
Yukihiro Yoshikawa, Kyoto, JP;
Kazuhito Imai, Amagasaki, JP;
Kunihiro Fukui, Kawanishi, JP;
Tamotsu Toki, Nishinomiya, JP;
Shuntaro Sudo, Toyota, JP;
Akira Obayashi, Toyota, JP;
Masanobu Ichikawa, Nisshin, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Toyota Jodosha Kabushiki Kaisha, Aichi, JP;
Toyoda Iron Works Co., Ltd., Aichi, JP;
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 () consisting essentially of an iron-zinc solid solution phase atop a base material steel sheet (). It also has a zinc oxide layer () 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 () and the zinc oxide layer () is at most 0.5 g/m, and/or the total amount of Al oxides contained in these layers is at most 5 mg/m.