Coating of stainless steel and titanium bipolar plates for anticorrosion in PEMFC: A review |
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| Authors: | Nur Fawwaz Asri Teuku Husaini Abu Bakar Sulong Edy Herianto Majlan Wan Ramli Wan Daud |
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| Affiliation: | 1. Fuel Cell Institute, National University of Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia;2. Department of Mechanical and Material Engineering, Faculty of Mechanical and Build Environment, National University of Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia;3. Department of Chemical and Process Engineering, Faculty of Mechanical and Build Environment, National University of Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia |
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| Abstract: | Anticorrosion coating for stainless steel (SS) and titanium bipolar plates were evaluated to improve the corrosion resistance and electrical conductivity in PEMFC. The PEMFC offers clean and environmentally friendly usage in electrical power systems. The bipolar plates contribute 60%–80% of the total components of PEMFC stack with electrical conductivity >100 S cm?1. Therefore, high conductivity and corrosion resistance are observed for long-term operations in PEMFC. Recent works has developed the cost-effective and feasible alternative materials to replace graphite bipolar plates. Metallic materials, such as SS and titanium, possess good electrical conductivity but poor corrosion resistance. Coating of SS and titanium bipolar plates can improve the corrosion resistance of metallic bipolar plates. Excellent performance of bipolar plates was recorded by using NbC coating for stainless steel materials. The ICR value using plasma surface alloying method was 8.47 mΩ cm2 with a low current density (Icorr) between 0.051 and 0.058 μA cm?2. The criteria for both current densities (<1 μA cm?2) and electrical conductivity (<10 mΩ cm2) met the DOE's 2020 technical targets. In addition, conventional air brush method can be used for fabricating multilayer coatings onto substrates because it is self-cleaning, low cost and offers high volume and large area production. Vapor deposition method, a highly advanced coating technology using PVD, suitable for coating bipolar plates because it is environmentally friendly and can be used in high temperatures, producing materials with good impact strength and excellent abrasion resistance. PEMFC cost is still too high for large scale commercialization, which is the cost of raw material and processing to allow fabrication of thinner plates contributes substantially to the total PEMFC cost. Some future works on fuel cell anticorrosion research with reasonable coating method is suggested to reduce the cost in order to facilitate the move toward commercialization especially for SS and titanium bipolar plates. |
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| Keywords: | Bipolar plates PEMFC Stainless steel Titanium Coating |
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