431Fuel Cell Stack, Bipolar Plate, and Gas Flow Channel
material processing techniques such as CNC milling, casting, etching, and
stamping. Among these, stamped metallic plates are the most common and
popular fabrication method. The process involves stamping a number of
required features such gas ow channels and internal manifolds and ports
using a series of stamping stations on this sheet metal, making it very effec-
tive in producing a large number of bipolar plates for a fuel cell stack in a
short time and cost-effective manner.
One of the major issues with the use of metallic bipolar plate is the pos-
sibility of corrosion. Corrosion occurs in a fuel cell owing to high humidity
conditions and formation of oxide layers leading to increas