Multi-layers coating for protecting metallic substrates
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United States of America Patent
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Dec 7, 2004
Grant Date -
May 29, 2003
app pub date -
May 20, 2002
filing date -
May 18, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an improved composite used as a bipolar separator plate in fuel cells. The composite of the invention comprises a steel substrate having a carbon coating thereon, the carbon coating comprises a carbon layer derived by pyrolysis of an acetylenic polymer having a content of carbon of at least 90%, the carbon layer protects the substrate against corrosion and improves long term contact resistivity, the polymer is soluble at a temperature below 110.degree. C. in an organic solvent, and the carbon layer contacts said steel substrate. A process for preparing the composite according to the invention is also disclosed.
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