TY - GEN
T1 - SURFACE TOPOGRAPHY EVALUATION DURING LONG-RUN MICRO-STAMPING OF BPPs AND ITS EFFECT ON CORROSION AND CONTACT RESISTANCE CHARACTERISTICS
AU - Peker, Mevlüt Fatih
AU - Gedikli, Hasan
AU - Cora, Ömer Necati
AU - Koç, Muammer
N1 - Publisher Copyright:
© 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Bipolar plates
KW - contact resistance
KW - corrosion resistance
KW - stamping
KW - surface topography
UR - http://www.scopus.com/inward/record.url?scp=85147190024&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85147190024
T3 - Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2
SP - 711
EP - 713
BT - Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference
A2 - Dincer, Ibrahim
A2 - Colpan, Can Ozgur
A2 - Ezan, Mehmet Akif
PB - International Association for Hydrogen Energy, IAHE
T2 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022
Y2 - 26 June 2022 through 30 June 2022
ER -