Stainless steel member for a fuel cell
AssigneeToyo Seikan Kaisha, Ltd.
InventorsKouki Kinouchi, Wataru Kurokawa, Shouzou Shintani, Daisuke Imoda, Kenji Yoshihiro, You Yamamori
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Abstract
A stainless steel material for a fuel cell, used for a fuel cell or a cartridge for the fuel cell, having a magnetic permeability of 1.000 to 2.500, and forming a layer having a value of chromium atomic %/iron atomic % of not less than 3.0 in the most surface thereof, and/or the layer of thickness of not less than 12 nm calculated as SiO2 having an oxygen atomic % of not less than 20%. Even when brought into contact with the content solution exhibiting acidity of the fuel cell, the stainless steel material reliably suppresses the elution of metal ions thereof.
Claims2
A stainless steel coil spring for a fuel cell or for a fuel cell cartridge, being made from an austenite type stainless steel, having a magnetic permeability that is decreased to 1.000 to 2.500 through stretching/coiling working, followed by tempering and forming a layer having a value of chromium atomic %/iron atomic % of not less than 3.0 in the most surface thereof, and/or a layer of a thickness of not less than 12 nm calculated as SiO2 having an oxygen atomic % of not less than 20%.
Dependencies are inferred from the claim text.