Ferritic stainless steel excellent in corrosion resistance and conductivity and method for manufacturing the same, separator of proton-exchange membrane fuel cell and proton-exchange membrane fuel cell
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United States of America Patent
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Mar 7, 2017
Grant Date -
Nov 28, 2013
app pub date -
Oct 6, 2011
filing date -
Oct 8, 2010
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Abstract
A ferritic stainless steel excellent in corrosion resistance and conductivity and a method for manufacturing the same, the stainless steel having a chemical composition containing, by mass %, C: 0.001% or more and 0.05% or less, Si: 0.001% or more and 0.5% or less, Mn: 0.001% or more and 1.0% or less, Al: 0.001% or more and 0.5% or less, N: 0.001% or more and 0.05% or less, Cr; 17% or more and 23% or less, Mo: 0.1% or less and the balance being Fe and inevitable impurities and a passivation film on the surface of the stainless steel which is obtained by immersing the stainless steel in a solution for an immersion treatment, said solution mainly contains hydrofluoric acid or a liquid mixture of hydrofluoric acid and nitric acid.
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