Corrosion resistance of functionally graded TiN/Ti coatings for proton exchange membrane fuel cells |
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Affiliation: | 1. Department of Metallurgical and Materials Engineering, Escola Politécnica da Universidade de São Paulo, Av. Prof. Mello Moraes, 2463, São Paulo-SP 05508-900, Brazil;2. Faculdade de Tecnologia de Cotia, Centro Estadual de Educação Tecnológica “Paula Souza”, Rua Nelson Raineri, 700, Cotia – SP 06702-155, Brazil;3. Chair of Non-Ferrous Metallurgy, Montanuniversitaet Leoben, Franz-Josef-Strasse 18, Leoben 8700, Austria;4. Laboratory of Plasmas, Films and Surfaces, Universidade do Estado de Santa Catarina, Rua Paulo Malschitzki, 200 – Zona Industrial Norte, Joinville-SC, 89219-710, Brazil;5. Centro de Ciências e Tecnologia dos Materiais, Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear em São Paulo, Av. Prof. Lineu Prestes, 2242 - Butantã, São Paulo - SP, 05508-000, Brazil |
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Abstract: | Bipolar Plates (BPP) are important components of proton exchange membrane fuel cell (PEMFC) stacks. In the development of innovative fuel cell designs, it is advantageous to use aluminum for these applications, however, this material lacks the necessary corrosion resistance. Since the performance of PEMFC stacks depends on BPP properties, in particular, corrosion resistance, depositing titanium nitride (TiN) thin films onto aluminum substrates may improve their efficiency and durability. The present work focuses on improving corrosion resistance and hydrophobicity of TiN/Ti by using N graded films deposited onto aluminum substrates (AA-1100) by grid-assisted magnetron sputtering (GAMS). Electrochemical impedance spectroscopy (EIS) and potentiodynamic and potentiostatic polarization are used to investigate the performance of the substrate/film system at room temperature and 70 °C, thus simulating a prototypic PEMFC electrolyte environment. Electrochemical test results showed that graded TiN films improved corrosion resistance when compared with both the homogeneous films and the AA1100 uncoated substrate. Furthermore, contact angle results reveal improved hydrophobicity for both homogeneous and graded TiN coatings when compared with the AA1100 substrate. |
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Keywords: | PEMFC Titanium nitride Bipolar plates Graded coatings Functionally graded materials Corrosion resistance |
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