Study of electrodeposited polypyrrole coatings for the corrosion protection of stainless steel bipolar plates for the PEM fuel cell |
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| Affiliation: | 1. CIE-UNAM, Priv. Xochicalco S/N, 62580 Temixco, Morelos, Mexico;2. Unidad de Materiales, Centro de Investigación Científica de Yucatán (CICY), Calle 43 no. 130, col. Chuburná de Hidalgo, 97200 Mérida, Yucatán, Mexico;1. School of Defense Science, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan;2. Department of Chemical & Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan;3. Department of Power Vehicle and Systems Engineering, Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan;1. School of Mechanical Engineering, KIIT University, Bhubaneswar 751024, India;2. School of Minerals Mettalurgical and Material IIT, Bhubaneswar 751007, india;1. Materials Science and Engineering Faculty, K.N. Toosi University of Technology, Tehran, Iran;2. Materials Science and Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran;1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;2. SINTEF Materials and Chemistry, 7465 Trondheim, Norway;1. Department of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, UK;2. SINTEF Materials and Chemistry, 7465 Trondheim, Norway;3. Teer Coatings Limited, Miba Coating Group, West Stone House, Berry Hill Industrial Estate, Droitwich Spa, Worcestershire WR9 9AS, UK |
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| Abstract: | Polypyrrole coatings were prepared on stainless steel SS304 in order to study the corrosion protection provided by the conductive polymer in a simulated PEM fuel cell environment. The polypyrrole was deposited by electrochemical polymerization with 0.04, 0.07 and 0.14 g cm?2 onto SS304 electrodes. Polarization curves, taken after immersion for 1, 3 or 24 h in 0.1 M sulphuric acid at either room temperature or 60 °C were used as an accelerated test. For short immersion times, it was found that corrosion current densities (at free corrosion potentials), diminished up to 2 orders of magnitude for samples tested at room temperature and up to 4 orders of magnitude for samples tested at 60 °C. Furthermore, at potentials in the range of the PEM fuel cell anode potential, corrosion rates also decreased up to several orders of magnitude. However, these protective properties were lost at longer times of immersion. The addition of DBSA to the polypyrrole coatings did lead to improved corrosion current densities at the free corrosion potential, however due to the loss of passivity of these samples, the corrosion rates in the potential range applicable to PEM fuel cells were either similar to or larger than bare metal. SEM was used to determine the morphology of the coatings and showed that the most homogeneous coating was obtained for 0.07 g cm?2 polypyrrole, without the incorporation of DBSA. |
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