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:
May. 23, 2006
Filed:
Mar. 14, 2003
Teruyuki Ohtani, Wako, JP;
Makoto Tsuji, Wako, JP;
Masao Utsunomiya, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A metal separator for fuel cells and a production method for the separator balances high corrosion resistance and high performance of electric generation due to low contact resistance. In the metal separator for fuel cells, a passivation film is formed on the surface thereof and x (MΩ·cm) calculated by an equation: (V)/(B−A) is in a range of 0.0026≦x≦0.04, wherein in a sulfuric acid solution at 90° C. and pH 3, V(V) is the highest voltage; V(V) is the lowest voltage; A (μA/cm) is corrosion current density in power generation at the lowest voltage V; and B (μA/cm) is corrosion current density in power generation at the highest voltage V.