| 摘要 |
This fuel cell separator is obtained by irradiating the surface of a molded article formed by molding a composition containing graphite powder, an epoxy resin, a phenol resin, a curing accelerator, and an internal mold lubricant and is provided with the following characteristics (1)-(6). Accordingly, the conductivity and hydrophilicity of a fuel cell separator provided with grooves that form flow paths for gas supply and exhausting on the surface thereof can be improved, and also elutability can be reduced. (1) Residue from laser irradiation of the surface is 5% or less by area ratio (2) Arithmetic average roughness (Ra) of surface is 0.80-1.50 µm (3) Surface static contact angle is 15-60° (4) Surface contact resistance is 3-7 m©·cm 2 (5) Ion exchanged water: under a condition of separator = 9:1 (mass ratio), the conductivity after the separator has been immersed in ion exchanged water at 90°C for 168 hours is 1.2 µS/cm or less (6) The change in the surface roughness with immersion for 2000 hours each in 90°C ion exchanged water and 150°C ion exchanged water is within 0.3 µm of that prior to immersion. |
