Corrosion Investigation of Chromium Nitride and Chromium Carbide Coatings for PEM Fuel Cell Bipolar Plates in Simulated Cathode Condition

Fuel Cells ◽  
2016 ◽  
Vol 16 (3) ◽  
pp. 356-364 ◽  
Author(s):  
H. Haghighat Ghahfarokhi ◽  
A. Saatchi ◽  
S. M. Monirvaghefi
Keyword(s):  
Fuel Cell ◽  
Chromium Carbide ◽  
Pem Fuel Cell ◽  
Chromium Nitride ◽  
Bipolar Plates ◽  
Carbide Coatings ◽  
Corrosion Investigation ◽  
Chromium Carbide Coatings

Metal bipolar plates for PEM fuel cell—A review

2007 ◽  
Vol 163 (2) ◽  
pp. 755-767 ◽  
Author(s):  
H. Tawfik ◽  
Y. Hung ◽  
D. Mahajan
Keyword(s):  
Fuel Cell ◽  
Pem Fuel Cell ◽  
Bipolar Plates

Performance of a PEM Fuel Cell Using Electroplated Ni–Mo and Ni–Mo–P Stainless Steel Bipolar Plates

2017 ◽  
Vol 164 (13) ◽  
pp. F1427-F1436 ◽  
Author(s):  
Hamed Rashtchi ◽  
Yasna Acevedo Gomez ◽  
Keyvan Raeissi ◽  
Morteza Shamanian ◽  
Björn Eriksson ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fuel Cell ◽  
Pem Fuel Cell ◽  
Bipolar Plates ◽  
Stainless Steel Bipolar Plates

Deposition of chromium oxide-chromium carbide coatings via high velocity suspension flame spraying (HVSFS)

2018 ◽  
Vol 351 ◽  
pp. 171-176 ◽  
Author(s):  
Andrea Förg ◽  
Matthias Blum ◽  
Andreas Killinger ◽  
José Andrés Moreno Nicolás ◽  
Rainer Gadow
Keyword(s):  
Chromium Carbide ◽  
Chromium Oxide ◽  
High Velocity ◽  
Flame Spraying ◽  
Carbide Coatings ◽  
Chromium Carbide Coatings

Grinding of Chromium Carbide Coatings Using Electroplated Diamond Wheels

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Zhongde Shi ◽  
Amr Elfizy ◽  
Helmi Attia ◽  
Gilbert Ouellet
Keyword(s):  
Surface Roughness ◽  
Chromium Carbide ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Depth Of Cut ◽  
Process Conditions ◽  
Carbide Coatings ◽  
Grinding Power ◽  
Chromium Carbide Coatings

This paper reports an experimental study on grinding of chromium carbide coatings using electroplated diamond wheels. The work was motivated by machining carbide coatings in gas turbine engine applications. The objective is to explore the process conditions and parameters satisfying the ground surface quality requirements. Surface grinding experiments were conducted with water-based grinding fluid on chromium carbide coated on flat surfaces of aluminum blocks for rough grinding at a fixed wheel speed vs = 30 m/s, and finish grinding at vs = 30, 60 m/s. The effects of depth of cut and workspeed on grinding power, forces, and surface roughness were investigated for each of the wheel speeds. Material removal rate Q = 20 mm3/s for rough grinding at a grinding width b = 101.6 mm was achieved. It was found that the maximum material removal rate achievable in rough grinding was restricted by chatters, which was mainly due to the large grinding width. The specific energy ranged from 27 to 59 J/mm3 under the tested conditions. Surface roughness Ra = 3.5–3.8 μm were obtained for rough grinding, while Ra = 0.6–1.5 μm were achieved for finish grinding. Surface roughness was not sensitive to grinding parameters under the tested conditions, but was strongly dependent on the diamond grain sizes. Imposing axial wheel oscillations to the grinding motions reduced surface roughness by about 60% under the tested condition. It was proved that it is feasible to grind the chromium carbide coating with electroplated diamond wheels.

Alloys that form conductive and passivating oxides for proton exchange membrane fuel cell bipolar plates

2004 ◽  
Vol 19 (6) ◽  
pp. 1723-1729 ◽  
Author(s):  
Neil Aukland ◽  
Abdellah Boudina ◽  
David S. Eddy ◽  
Joseph V. Mantese ◽  
Margarita P. Thompson ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Oxide Films ◽  
Pem Fuel Cell ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Bipolar Plates ◽  
Concentrated Solutions ◽  
Exchange Membrane

During the operation of proton exchange membrane (PEM) fuel cells, a high-resistance oxide is often formed on the cathode surface of base metal bipolar plates. Over time, this corrosion mechanism leads to a drop in fuel cell efficiency and potentially to complete failure. To address this problem, we have developed alloys capable of forming oxides that are both conductive and chemically stable under PEM fuel cell operating conditions. Five alloys of titanium with tantalum or niobium were investigated. The oxides were formed on the alloys by cyclic voltammetry in solutions mimicking the cathode- and anode-side environment of a PEM fuel cell. The oxides of all tested alloys had lower surface resistance than the oxide of pure titanium. We also investigated the chemical durability of Ti–Nb and Ti–Ta alloys in more concentrated solutions beyond those typically found in PEM fuel cells. The oxide films formed on Ti–Nb and Ti–Ta alloys remained conductive and chemically stable in these concentrated solutions. The stability of the oxide films was evaluated; Ti alloys having 3% Ta and Nb were identified as potential candidates for bipolar plate materials.

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