Metal separator for fuel cell and production method therefor

Details Metal separator for fuel cell and production method therefor Metal separator for fuel cell and production method therefor

2006-05-23

2006-05-23

Kalafut, Stephen J. (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C428S469000, C148S240000, C148S500000

Reexamination Certificate

active

07049022

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·cm2) calculated by an equation: (VH−VL)/(B−A) is in a range of 0.0026≦x≦0.04, wherein in a sulfuric acid solution at 90° C. and pH 3, VH(V) is the highest voltage; VL(V) is the lowest voltage; A (μA/cm2) is corrosion current density in power generation at the lowest voltage VL; and B (μA/cm2) is corrosion current density in power generation at the highest voltage VH.

REFERENCES:
patent: 5009963 (1991-04-01), Ohmi et al.
patent: 6835487 (2004-12-01), Takao et al.
patent: 6884363 (2005-04-01), Ohtani et al.
patent: 2004/0253503 (2004-12-01), Ohtani et al.
patent: 2005/0089742 (2005-04-01), Ishigami et al.

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