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Formation of a protective nitride layer by electrochemical nitridation on 316L SS bipolar plates for a proton exchange membrane fuel cell (PEMFC)

机译:通过电化学氮化在316LS两极板上形成保护氮化物层,用于质子交换膜燃料电池(PEMFC)

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摘要

In the present study, an attempt has been made to increase the corrosion resistance of 316L stainless steel (SS) bipolar plates (Bp) through electrochemical nitridation using a nitrate bearing electrolyte solution of 0.1 M HNO3 and 0.5 M KNO3. The X-ray photoelectron spectroscopy (XPS) studies revealed that the modified SS was covered with ammonium ions and mixed nitrides, namely CrN and Cr2N, on the surface. The average contact angle value with water for nitrided SS favored a PEMFC operating environment. The electrochemical corrosion behaviour was studied in a simulated PEMFC environment (0.5 M H2SO4 and 2 ppm of HF) to ensure that the modified SS exhibits enhanced corrosion resistance. Surface resistance values for both untreated and nitrided SS showed low values and increased conductivity after the polarization studies.
机译:在本研究中,已经尝试通过使用0.1M HNO3和0.5M KNO3的硝酸含有电解质溶液来提高316L不锈钢(SS)双极板(BP)的耐腐蚀性通过电化学氮化。 X射线光电子能谱(XPS)研究表明,改性的SS在表面上被铵离子和混合氮化物,即CrN和Cr2N覆盖。 氮化SS水的平均接触角值支持PEMFC操作环境。 在模拟PEMFC环境(0.5M H 2 SO 4和2ppm)中研究了电化学腐蚀行为,以确保改性的SS具有增强的耐腐蚀性。 未处理和氮化SS的表面电阻值显示出低值和偏振研究后的导电性增加。

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  • 来源
    《RSC Advances》 |2015年第79期|共5页
  • 作者单位

    Anna Univ Dept Chem Madras 25 Tamil Nadu India;

    CSIR Natl Aerosp Labs Surface Engn Div Bangalore Karnataka India;

    Anna Univ Dept Chem Madras 25 Tamil Nadu India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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