Stainless steel separator for fuel cell and the manufacturing method thereof
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United States of America Patent
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Sep 9, 2014
Grant Date -
May 27, 2010
app pub date -
Jul 27, 2007
filing date -
Apr 18, 2007
priority date (Note) -
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Abstract
A method for surface treatment of a stainless steel separator for a fuel cell comprises preparing a stainless steel sheet containing nickel, chrome and iron, and having a passive film on a surface of the stainless steel sheet, and dipping the stainless steel sheet into a mixed etching solution of nitric acid (HNO3) and sulfuric acid (H2SO4) at a temperature of 50-70° C. for 30 seconds to 30 minutes to selectively lower an amount of Fe in the passive film formed on the surface of the stainless steel sheet.
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