• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Reduction of Contact Resistance on Titanium Sheet Surfaces by Formation of Titanium Carbide and Nitride, and its Stability in Sulfuric Acid Aqueous Solution
【24h】

Reduction of Contact Resistance on Titanium Sheet Surfaces by Formation of Titanium Carbide and Nitride, and its Stability in Sulfuric Acid Aqueous Solution

机译：碳化钛和氮化物的形成降低钛板表面的接触电阻及其在硫酸水溶液中的稳定性

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Separators for solid polymer fuel cells must have a low contact resistance with the carbon paper and stability in a corrosive environment of sulfuric acid in the cell. The titanium surface is highly resistant to corrosion thanks to a passive film but has high contact resistance.In this study, titanium carbide or nitride as the electrical conductor was formed on the surface by annealing commercially pure titanium sheet. The contact resistances of these sheets were evaluated before and after a sulfuric acid aqueous solution exposure test, “with a pH of 4 at 80°C for 4 days”, briefly simulating the operating environment. In addition, the same evaluation test was conducted with a surface with TiC formed dipped in nitric acid to enhance the stability in a sulfuric acid solution.The initial contact resistance falls below 10 mΩ·cm~(2) by formation of TiC and TiN, Ti_(2)N on sheet surface. However, the contact resistance rises to 100 or above after the exposure test because a large amount of TiO_(2) precipitates. This is probably because TiC and TiN are dissolved by sulfuric acid, generating TiO_(2).By contrast, dipping in nitric acid hardly raises the contact resistance from less than 10 even after the exposure test. It is considered from the results of surface analyses that Ti ion generated by partial dissolution of TiC is turned into TiO_(2) by the oxidizability of nitric acid, changing the surface structure covering TiC. It is considered that the newly formed TiO_(2) film enhanced stability in a sulfuric environment.
机译：用于固体聚合物燃料电池的隔板必须具有与碳纸的低接触电阻，并且必须在电池中硫酸的腐蚀性环境中具有稳定性。钛表面由于具有钝化膜而具有很高的耐腐蚀性能，但是具有高接触电阻。在硫酸水溶液暴露测试之前和之后，“在80°C下4的pH为4天”之前和之后，评估了这些片的接触电阻，简要模拟了操作环境。另外，对形成的TiC浸在硝酸中以提高其在硫酸溶液中的稳定性的表面进行了相同的评估测试。通过形成TiC和TiN，初始接触电阻降至10mΩ·cm〜（2）以下，薄板表面上的Ti_（2）N。但是，由于大量的TiO_（2）析出，接触电阻在暴露测试后上升到100或更高。这可能是因为TiC和TiN被硫酸溶解，生成TiO_（2）。相反，即使经过暴露测试，浸入硝酸也几乎不会将接触电阻从小于10升高。从表面分析的结果认为，由TiC的部分溶解产生的Ti离子通过硝酸的可氧化性而变成TiO_（2），从而改变了覆盖TiC的表面结构。认为新形成的TiO_（2）膜增强了在硫酸环境中的稳定性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号