FUEL CELL SEPARATOR AND METHOD FOR PRODUCING THE SAME

摘要

First, a passive film is removed from a surface of a separator sheet. For example, the separator sheet may be immersed in an acidic liquid to remove the passive film. Then, the separator sheet is washed with water, taken out from the water, and heated. After the heating, the separator sheet is subjected to an electrolytic treatment to obtain a separator for a fuel cell. The resultant separator has a seal forming portion, and the outermost surface of the seal forming portion contains, based on 100% by weight of the total of a Cr oxide, an Mo oxide, an Fe oxide, Fe, and Ni, 5% by weight or less of the sum of the Fe and Ni and 60% by weight or more of the Cr oxide.

主权项

1. A separator comprising a metal for use in a unit cell of a fuel cell having an electrolyte electrode assembly containing an anode, a cathode, and an electrolyte interposed therebetween, wherein
the separator has a seal forming portion, a sealant being disposed between the seal forming portion and another separator or between the seal forming portion and the electrolyte electrode assembly, and an outermost surface of the seal forming portion contains, based on 100% by weight of the total of a Cr oxide, an Mo oxide, an Fe oxide, Fe, and Ni, 60% by weight or more of the Cr oxide and 5% by weight or less of the sum of the Fe and Ni.