Patent ID: 9425450
Filing Date: 2016-08-23
CPC Classification: C21D,C22C,C23C,C23G,C25D,H01M,Y02E,Y02P

Claim Text:
1. A method of manufacturing a stainless steel separator for fuel cells, the method comprising: preparing a stainless steel sheet as a matrix; performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet; heat-treating the surface-modified stainless steel sheet at 100˜300° C. under a vacuum condition; and forming a coating layer directly on the heat-treated stainless steel sheet, wherein the coating layer is a metal boride layer (MBz), and wherein 0.5≦z≦2.