Composition and method for surface treatment of oxidized metal
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United States of America Patent
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Apr 20, 2010
Grant Date -
Dec 1, 2005
app pub date -
Jun 24, 2005
filing date -
Aug 11, 2003
priority date (Note) -
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Abstract
The present invention provides an electrically conductive element for a proton exchange membrane fuel cell having low electrical contact resistance and high corrosion resistance. The conductive element comprises a corrosion susceptible metal substrate with a surface, which is preferably treated to activate the surface (i.e. to remove a passivation layer of oxides from the surface) with an acidic treatment solution. The treated surface is then overlaid with an electrically conductive, corrosion-resistant, protective coating to protect the substrate re-forming a passivation layer while exposed to the corrosive environment of the fuel cell. The present invention also provides methods of preparing an electrically conductive element to have low electrical contact resistance and high corrosion resistance.
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