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通过热轧制备的316L不锈钢双极板上的耐腐蚀导电涂层

Corrosion-Resistant and Conductive Coatings on 316L Stainless Steel Bipolar Plates Fabricated by Hot Rolling.

作者信息

Zhao Xiaojun, Wang Zihao, Xiao Lairong, Zha Yitao, Deng Guanzhi, Li Shaohao, Cai Zhenyang, Liu Sainan

机构信息

School of Materials Science and Engineering, Central South University, Changsha 410083, China.

State Key Laboratory of Powder Metallurgy, Ministry of Education, Central South University, Changsha 410083, China.

出版信息

Materials (Basel). 2025 Apr 16;18(8):1831. doi: 10.3390/ma18081831.

DOI:10.3390/ma18081831
PMID:40333489
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12029055/
Abstract

The insufficient corrosion resistance and high interfacial contact resistance (ICR) of 316L stainless steel (316L SS) severely limit its application as bipolar plates (BPs) in proton exchange membrane fuel cells (PEMFCs). In this study, a graphite/carbon black/PVDF composite coating was first developed by hot rolling on the surface of 316L SS to enhance both corrosion resistance and conductivity. By incorporating 5 wt% polyaniline (PANI) as a corrosion inhibitor, the optimized RP5 coating exhibited further improvements in corrosion resistance. The potentiodynamic polarization tests revealed that the RP5 coating achieved a corrosion current density of 0.977 μA·cm, representing a two-orders of magnitude reduction compared to bare 316L SS (34.1 μA·cm). The coating also exhibits a satisfactory interfacial contact resistance (ICR) of 8.20 mΩ·cm at 1.5 MPa, meeting the U.S. Department of Energy (DOE) 2025 targets (<10 mΩ·cm). Additionally, the RP5 coating exhibited superior hydrophobicity with a water contact angle of 96.5°, which is advantageous for water management within PEMFCs. The results confirm that the RP5 coating achieves an optimal balance between high conductivity, excellent corrosion resistance, and improved hydrophobicity, making it a promising solution for advancing PEMFC bipolar plates' performance.

摘要

316L不锈钢（316L SS）耐腐蚀性不足以及界面接触电阻（ICR）过高，严重限制了其作为质子交换膜燃料电池（PEMFC）双极板（BP）的应用。在本研究中，首先通过热轧在316L SS表面制备了石墨/炭黑/PVDF复合涂层，以提高其耐腐蚀性和导电性。通过加入5 wt%的聚苯胺（PANI）作为缓蚀剂，优化后的RP5涂层在耐腐蚀性方面有进一步提升。动电位极化测试表明，RP5涂层的腐蚀电流密度为0.977 μA·cm²，与裸316L SS（34.1 μA·cm²）相比降低了两个数量级。该涂层在1.5 MPa下还表现出令人满意的界面接触电阻（ICR），为8.20 mΩ·cm，满足美国能源部（DOE）2025年的目标（<10 mΩ·cm）。此外，RP5涂层具有96.5°的水接触角，表现出优异的疏水性，这对PEMFC内的水管理有利。结果证实，RP5涂层在高导电性、优异耐腐蚀性和改善疏水性之间实现了最佳平衡，使其成为提升PEMFC双极板性能的一个有前景的解决方案。

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Current status of research on composite bipolar plates for proton exchange membrane fuel cells (PEMFCs): nanofillers and structure optimization.质子交换膜燃料电池（PEMFC）复合双极板的研究现状：纳米填料与结构优化
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