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首页> 外文会议>European corrosion congress;International corrosion congress;Pprocess safety congress >Corrosion performance of electropolymerized doped polypyrrole coatings on a 316L stainless steel bipolar plates for proton exchange membrane fuel cells (PEMFC)
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Corrosion performance of electropolymerized doped polypyrrole coatings on a 316L stainless steel bipolar plates for proton exchange membrane fuel cells (PEMFC)

机译：质子交换膜燃料电池（PEMFC）在316L不锈钢双极板上电聚合掺杂的聚吡咯涂层的腐蚀性能

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Bipolar plates are the current collector in proton exchange membrane fuel cells. Bipolar plates are generally made of graphite, which makes them expensive and heavy. For the development of alternative materials to reduce the cost of the fuel cell is therefore necessary. Concerning the bipolar plates a promising alternative is to use stainless steel. However, due to the aggressive environment of the cell, materials with both high resistance to corrosion and high electrical conductivity are requested. To that aim, the coating of stainless steel with a conductive polymer is more and more considered. The coating specifications are a very low contact resistance (< 10 mΩ.cm~2 at 150 N/cm~2), a high corrosion resistance in aggressive acidic environment i.e. sulfuric acid 0.6 M at 60°C and a strong compatibility with shaping. The technique selected in this work is electropolymerization which combines the formation of the polymer and the deposition of the coating in one way process. Polypyrrole is the intrinsically conductive polymer selected because of its high conductivity (under appropriate doping), chemical stability and easy synthesis from water-based electrolyte solution. In order to improve the contact and the corrosion resistance of the polypyrrole layer the addition of specific dopants (salts) and charges (graphene) were considered. The influence of the dopant and charges on the electrosynthesis of pyrrole was investigated through cyclic voltammetry. Coatings were applied on 316L stainless steel after etching performed to remove the passive layer, to allow reducing the contact resistance and to improve the coating adhesion on the substrate. Deposition was carried out galvanostatically under pulsed current. The thickness and the morphology of the coatings were determined by using a SEM-FEG. Corrosion performance was evaluated in sulfuric acid 0.6M at 60°C by electrochemical techniques.
机译：双极板是质子交换膜燃料电池中的集电器。双极板通常由石墨制成，这使其昂贵且笨重。因此，为了开发替代材料以降低燃料电池的成本是必要的。关于双极板，一种有前途的替代方法是使用不锈钢。然而，由于电池的侵蚀性环境，需要兼具高耐腐蚀性和高导电性的材料。为此，越来越多地考虑用导电聚合物涂覆不锈钢。涂层的规格是非常低的接触电阻（在150 N / cm〜2时<10mΩ.cm〜2），在侵蚀性酸性环境中（即在60°C时为0.6 M的硫酸）具有很高的耐腐蚀性以及与成型的强相容性。在这项工作中选择的技术是电聚合，它以一种方法将聚合物的形成和涂层的沉积结合在一起。聚吡咯是本征导电聚合物，因为它具有高电导率（在适当的掺杂条件下），化学稳定性好并且易于从水基电解质溶液中合成。为了改善聚吡咯层的接触和耐腐蚀性，考虑添加特定的掺杂剂（盐）和电荷（石墨烯）。通过循环伏安法研究了掺杂剂和电荷对吡咯电合成的影响。进行蚀刻后，在316L不锈钢上施加涂层以去除钝化层，以降低接触电阻并提高涂层在基材上的附着力。沉积是在脉冲电流下恒电流进行的。通过使用SEM-FEG确定涂层的厚度和形态。通过电化学技术在60℃的0.6M硫酸中评估腐蚀性能。

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