Corrosion resistance and conductivity of CrN, CrAlN, and CrTiN coatings applied to bipolar plates for proton exchange membrane fuel cells

Journal of Vacuum Science & Technology A Pub Date : 2024-05-23 DOI:10.1116/6.0003601

Qiang Chen, Mingxu Su, Dan Liang, Qiong Zhou, Biao Huang, E. Zhang

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Abstract

In order to improve the corrosion resistance and conductivity of 316L stainless steel bipolar plates used for proton exchange membrane fuel cells, three Cr-containing nitride coatings were deposited on 316L stainless steel by multiarc ion plating. First, the microstructure, composition, and contact angle of the three coatings were systematically investigated. Then, electrochemical impedance spectroscopy, potentiodynamic polarization, potentiostatic polarization (PSP), and interfacial contact resistance (ICR) of the three coatings were also fully examined. The results revealed that CrN coating has the highest contact angle of 98.26°, indicating its superior hydrophobicity. Additionally, CrN coating performed the best corrosion resistance with the highest corrosion potential of 0.31 V, the lowest corrosion current density of 2.28 × 10−7 A cm−2, and the largest resistance. Furthermore, CrN coating showed the lowest current density during PSP tests and the smallest ICR value after corrosion. The superior corrosion resistance of CrN coating is mainly attributed to its decreased pore density caused by vacancylike defects and its uniform structure. This article provided evidence for the potential application of CrN coating to bipolar plates.

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应用于质子交换膜燃料电池双极板的 CrN、CrAlN 和 CrTiN 涂层的耐腐蚀性和导电性

为了提高质子交换膜燃料电池用 316L 不锈钢双极板的耐腐蚀性和导电性，通过多弧离子镀在 316L 不锈钢上沉积了三种含铬氮化物涂层。首先，系统研究了三种镀层的微观结构、成分和接触角。然后，还对三种镀层的电化学阻抗谱、电位极化、电位静态极化（PSP）和界面接触电阻（ICR）进行了全面研究。结果表明，CrN 涂层的接触角最大，达到 98.26°，表明其具有优异的疏水性。此外，CrN 涂层的耐腐蚀性能最好，腐蚀电位最高，为 0.31 V，腐蚀电流密度最低，为 2.28 × 10-7 A cm-2，电阻最大。此外，CrN 涂层在 PSP 测试中的电流密度最低，腐蚀后的 ICR 值最小。CrN 涂层的优异耐腐蚀性主要归功于其空泡缺陷导致的孔隙密度降低及其均匀的结构。这篇文章为 CrN 涂层在双极板上的潜在应用提供了证据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Vacuum Science & Technology A

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