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首页> 外文学位 >Development of Multilayer Titanium Nitride-Based Coatings as Corrosion Resistant Films for Stainless Steel Bipolar Plates in PEM Fuel Cells
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Development of Multilayer Titanium Nitride-Based Coatings as Corrosion Resistant Films for Stainless Steel Bipolar Plates in PEM Fuel Cells

机译：用于PEM燃料电池的不锈钢双极板的多层氮化钛基涂层作为耐腐蚀膜的开发

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摘要

High cost and short lifetime are the two main reasons why the PEM fuel cell has not reached a widespread, disruptive level of commercialization. Conventional graphite bipolar plates are responsible for about 45% of the cost and 85% of the total weight of a single cell. These measures are linked to difficult machining of thick, brittle graphite and processing needed to render graphite non-porous. Stainless steel is suggested as the replacement bipolar plate material due to its favorable mechanical properties, ease of manufacturing and relatively low price, but requires a cost-effective coating as a non-conductive oxide forms on the bare stainless-steel surface in PEMFC environment. This study aims to demonstrate improvements made to PVD coatings of TiN by integrating an additional thin, pure-Ti layer between substrate and coating, as has been extensively studied in integrated circuit manufacturing, biomedical coatings, and thin film photovoltaic applications, to minimize coating defects that currently prevent these coatings from widespread commercial use. We are not aware of any previous studies that have directly evaluated the strategy's effectiveness for stainless steel BPP corrosion protection in PEMFC.;Corrosion tests were performed in H2SO4 electrolyte (pH 3, 70°C) to mimic PEMFC operating condition. Before and after each corrosion test, XPS, ICR, SEM, and ICP-MS techniques were utilized to evaluate coating performance as a corrosion-inhibitor. Results obtained show a multilayer approach with the additional Ti layer improved corrosion resistance as observed through lower ICR, contamination in the TiN film, metal ion poisoning of electrolyte and density/size of cracks and pits in the films. TiN showed significant surface oxide formation which explains the gain in contact resistance to levels above the DOE standard for bipolar plates.
机译：高成本和短寿命是PEM燃料电池尚未达到广泛的破坏性商业化水平的两个主要原因。传统的石墨双极板约占单个电池成本的45％，占其总重量的85％。这些措施与难加工厚而脆的石墨以及使石墨无孔所需的处理有关。由于其良好的机械性能，易于制造和相对较低的价格，建议使用不锈钢作为双极板的替代材料，但由于在PEMFC环境中在不锈钢裸露的表面上形成了非导电氧化物，因此需要具有成本效益的涂层。这项研究旨在通过在基板和涂层之间集成额外的纯钛薄层来证明对TiN的PVD涂层的改进，这已在集成电路制造，生物医学涂层和薄膜光伏应用中进行了广泛研究，以最大程度地减少涂层缺陷目前阻止这些涂料广泛用于商业用途。我们之前没有任何研究直接评估该策略对PEMFC不锈钢BPP腐蚀防护的有效性。;在H2SO4电解液（pH 3，70°C）中进行了模拟PEMFC操作条件的腐蚀试验。在每次腐蚀测试之前和之后，都使用XPS，ICR，SEM和ICP-MS技术来评估涂层作为腐蚀抑制剂的性能。所得结果表明多层方法具有附加的Ti层，如通过较低的ICR，TiN膜中的污染，电解质的金属离子中毒以及膜中裂纹和凹坑的密度/大小所观察到的，其耐腐蚀性得到了改善。 TiN表现出明显的表面氧化物形成，这说明接触电阻的增加达到双极板DOE标准之上的水平。

著录项

  • 作者

    Padula, Nicholas A.;

  • 作者单位

    State University of New York at Albany.;

  • 授予单位 State University of New York at Albany.;
  • 学科 Materials science.;Nanotechnology.
  • 学位 M.S.
  • 年度 2017
  • 页码 51 p.
  • 总页数 51
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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