STAINLESS STEEL HAVING EXCELLENT SURFACE ELECTRICAL CONDUCTIVITY FOR FUEL CELL SEPARATOR AND MANUFACTURING METHOD THEREFOR

• Main Authors: KIM, Jong-hee, SEO, Bo-sung, KIM, Kwangmin, KIM, Youngjun
• Format: Patent
• Language: English
• Published: 09.02.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Disclosed is a stainless steel having excellent surface electrical conductivity for a fuel cell separator. According to an embodiment of the disclosed stainless steel having excellent surface electrical conductivity for a fuel cell separator, a value of the following surface oxide atomic ratio (1) may be 0.5 or less, as measured on the surface of a stainless steel containing 15 wt % or more of Cr by X-ray angle-resolved photoemission spectroscopy using an Al-Kα X-ray source under the condition where a take-off angle of photoelectrons is from 12° to 85°.sum⁢of⁢atomic⁢concentrations⁢(at⁢%)of⁢metal⁢elements⁢in⁢metal⁢oxide(MO)sum⁢of⁢atomic⁢concentrations⁢(at⁢%)of⁢metal⁢elements⁢in⁢total⁢oxides⁢and⁢hydroxides(1)The metal oxide (MO) includes a mixed oxide: M represents an alloying element other than Cr and Fe or a combination thereof in the matrix; and O represents oxygen. The total oxides and hydroxides include a Cr oxide, a Cr hydroxide, an Fe oxide, an Fe hydroxide, and the metal oxide (MO).