Patent ID: 7807281
Filing Date: 2010-10-05
Classification: B22F,C22C,H01M,Y02E,Y02P

Abstract:
1. A solid polymer fuel cell separator comprised of stainless steel, titanium, or a titanium alloy at part or all of the surface of which a low ion release conductive substance is buried, said solid polymer fuel cell separator characterized in that said separator surface has an arithmetic mean roughness (Ra) of 0.5 to 5.0 μm, a 10-point mean roughness (Rz) of 3 to 20 μm, and an average spacing of surface relief shapes (Sm) of 300 μm or less, at predetermined positions near the four corners of said separator, when an origin is O, placing L near a corner in a rolling direction of the sheet from the origin O, C near a corner in a direction vertical to rolling direction from the origin O, and X near a corner in a diagonal direction from the origin O, a length of a line segment between OL is LL, a length of an OC line segment is LC, a length between OX is LX, a maximum strain height from the line OL to the center plane in a thickness direction of the separator is HL1, one from the line CX is HL2, from the line OC is HC1, from the line LX is HC2, one from the line OX is HXC, and a distance between point X and a plane formed by points O, L, and C is HXT, the values of warp rates W