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Detection and analysis of corrosion and contact resistance faults of tin and crn coatings on 410 stainless steel as bipolar plates in PEM fuel cells
, Article Sensors ; Volume 22, Issue 3 , 2022 ; 14248220 (ISSN) ; Kashyzadeh, K. R ; Borjali, A ; Ivanov, A ; Jafarnode, M ; Gan, T. H ; Wang, B ; Chizari, M ; Sharif University of Technology
MDPI
2022
Abstract
Bipolar Plates (BPPs) are the most crucial component of the Polymer Electrolyte Membrane (PEM) fuel cell system. To improve fuel cell stack performance and lifetime, corrosion resistance and Interfacial Contact Resistance (ICR) enhancement are two essential factors for metallic BPPs. One of the most effective methods to achieve this purpose is adding a thin solid film of conductive coating on the surfaces of these plates. In the present study, 410 Stainless Steel (SS) was selected as a metallic bipolar plate. The coating process was performed using titanium nitride and chromium nitride by the Cathodic Arc Evaporation (CAE) method. The main focus of this study was to select the best coating...
Modelling of Pressure Effect on Metal/Mold Interface Resistance in the A356 Aluminium Alloy Casting Process
, M.Sc. Thesis Sharif University of Technology ; Davami, Parviz (Supervisor) ; Varahram, Naser (Supervisor)
Abstract
The computer simulation of freezing patterns in castings has done much to broaden our understanding of casting and mold system design. The structural integrity of shaped castings is closely related to the time–temperature history during solidification, and the use of casting simulation could do much to increase this knowledge in the foundry industry. However, some uncertainties must be eradicated, particularly heat transfer at the metal/mold interface. The accurate knowledge of interfacial heat transfer coefficients is necessary for accurate modeling of castings. The present work focuses on the determination of transient mold–environment and metal–mold heat transfer coefficients during...
Hydrophobic octadecylamine-functionalized graphene/TiO2 hybrid coating for corrosion protection of copper bipolar plates in simulated proton exchange membrane fuel cell environment
, Article International Journal of Hydrogen Energy ; Volume 45, Issue 30 , 2020 , Pages 15380-15389 ; Hadidi, M. R ; Salehzadeh, D ; Nemati, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
In the present work, G-TiO2 and G-ODA-TiO2 hybrids were prepared by concurrent surface functionalization and reducing of graphene oxide (GO) using octadecylamine (ODA). The G-TiO2 and G-ODA-TiO2 powders were deposited on the copper surface by electrophoretic deposition (EPD) technique. The wettability of coatings revealed the preferable hydrophobic characteristic of G-ODA-TiO2 compared to G-TiO2 and bare copper with water contact angles of 130°, 101°, and 87°, respectively. The anti-corrosion performance of specimens in a 0.5 M H2SO4 solution was appraised by the potentiodynamic polarization (Tafel analysis), which clearly showed that G-TiO2 and G-ODA-TiO2 coatings can act as a great barrier...
Modeling of metal-mold interface resistance in the Al-11.5 wt% Si alloy casting process
, Article Scientia Iranica ; Volume 14, Issue 1 , 2007 , Pages 46-55 ; 10263098 (ISSN) ; Shirinparvar, M ; Davami, P ; Sharif University of Technology
Sharif University of Technology
2007
Abstract
In this investigation, a computational-model has been developed, including heat transfer and the effects of the resistance of a metal-mold interface and pressure, for simulation of the solidification process. Simulation of the interface resistance is based on the Zero Thickness Element (ZTE), utilizing the Finite Element Method (FEM). Solid boundary conditions, including contact resistances, have been modified by a pressure gradient in each of the ZTE. The pressure gradient has been modeled, based on experimental data. In order to verify the computational results, an Al-11.5 wt% Si alloy was poured into a permanent mold and the temperature of the interface was measured by a data acquisition...