Abstract: Provided are a metallic separator for fuel cell in which a Cr2N layer is formed on the surface of base metals, and a method of fabricating the metallic separator or fuel cell. The method comprises: plating chromium layer on the surface of the base metal; and forming a Cr2N layer by nitriding the chromium-plated layer in properly selected nitriding conditions. Only the Cr2N layer, which has lower electrical resistivity than CrN, is selectively fabricated on the surface of the base metal. The interfacial contact resistance of the separator is reduced and the efficiency of the fuel cell can be improved. In addition, since a low-priced general metals or alloys such as stainless steels, carbon steels, alloy steels or even nonferrous alloys can be used as the base metal, the cost of the fabrication of metallic separator can be significantly reduced. The thickness of the separator can be made as small as to 0.2 mm, the weight and total thickness of a fuel cell stack can be significantly reduced.

Abstract: Provided are a metallic separator for fuel cell in which a Cr2N layer is formed on the surface of base metals, and a method of fabricating the metallic separator for fuel cell. The method comprises: plating chromium layer on the surface of the base metal; and forming a Cr2N layer by nitriding the chromium-plated layer in properly selected nitriding conditions. Only the Cr2N layer, which has lower electrical resistivity than CrN, is selectively fabricated on the surface of the base metal. The interfacial contact resistance of the separator is reduced and the efficiency of the fuel cell can be improved. In addition, since a low-priced general metals or alloys such as stainless steels, carbon steels, alloy steels or even nonferrous alloys can be used as the base metal, the cost of the fabrication of metallic separator can be significantly reduced. The thickness of the separator can be made as small as to 0.2 mm, the weight and total thickness of a fuel cell stack can be significantly reduced.