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AssigneeHyundai Motor Company
InventorsIn Woong Lyo, Jeong Uk An, Sung Moon Choi, Seung Gyun Ahn, Young Min Nam, Yoo Chang Yang
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A metallic bipolar plate for a fuel cell, in which a carbon coating layer containing fluorine is formed on the surface of a stainless steel base material, thus having excellent electrical conductivity and corrosion resistance and further excellent water draining performance and heat radiating performance. In the metallic bipolar plate for a fuel cell of the present invention, the internal residual stress in the surface coating layer is significantly reduced due to the addition of fluorine, and thereby it is possible to improve the adhesive strength between the stainless steel and the surface coating layer.
1-3. (canceled)
A method for forming a surface layer of a metallic bipolar plate for a fuel cell, the method comprising forming a carbon coating layer containing 25 to 35 AT. % of fluorine on the surface of a stainless steel base material for a fuel cell bipolar plate by a plasma assisted chemical vapor deposition, wherein carbon coating layer is formed using a precursor including methane (CH4) and carbon trifluoride (CHF3) gas.
Dependencies are inferred from the claim text.