Akademik Veri Yönetim Sistemi
23rd World Hydrogen Energy Conference (WHEC 2022), İstanbul, Türkiye, 26 - 30 Haziran 2022, ss.1
Long-run stamping of bipolar
plates affects die life, and bipolar plate geometric accuracy, formability and
surface quality characteristics. These characteristics, in turn, would affect
the corrosion and contact resistance of BPPs, consequently the fuel cell
performance. The aim of this study was to investigate the reasons and
consequences of the interactions during the mass manufacturing of micro-stamped
sheets, and establish correlations between surface interactions vs. corrosion
and contact resistance of BPPs. In experimental part of this study, 10,000
SS316L sheet blanks with 51µm in thickness were micro-stamped under 175-225 kN
stamping force levels with a constant stamping speed of 1mm/s. Surface
inspections, corrosion and contact resistance tests were carried out on the
BPPs, periodically. On the other hand, 3-D finite element model of
micro-stamping process was established to determine the coefficient of friction
at the contact interface of micro-stamping dies and BPPs, von-Mises equivalent
stress, plastic strain and final sheet thickness distributions. The results
revealed that the roughness values for die pairs and BPPs followed similar
trends during 10,000 micro-stampings. The corrosion resistance variation as a
consequence of long-run manufacturing was found to be statistically
insignificant, and the relation between surface roughness and corrosion
resistance was found to be indirect.
Keywords: Bipolar plates, stamping, surface
topography, contact resistance, corrosion resistance