质子交换膜燃料电池不锈钢双极板表面Cr<sub>2</sub>AlC涂层的制备与耐蚀性能

doi:10.11902/1005.4537.2022.008

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 62-68 CSTR: 32134.14.1005.4537.2022.008 DOI: 10.11902/1005.4537.2022.008

研究报告

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质子交换膜燃料电池不锈钢双极板表面Cr₂AlC涂层的制备与耐蚀性能

刘云, 任延杰(

), 陈荐, 周立波, 邱玮, 黄伟颖, 牛焱

长沙理工大学能源与动力工程学院长沙 410114

Preparation and Corrosion Resistance of Ternary Layered Compound Cr₂AlC Coating on 304 Stainless Steel for Bipolar Plates of PEMFC

LIU Yun, REN Yanjie(

), CHEN Jian, ZHOU Libo, QIU Wei, HUANG Weiying, NIU Yan

Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China

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摘要:

采用直流磁控溅射技术在304不锈钢双极板表面沉积Cr₂AlC MAX相涂层。利用扫描电镜 (SEM)、X射线衍射 (XRD)、X射线光电子能谱 (XPS) 等对涂层的形貌、微观组织进行分析；采用电化学方法研究了Cr₂AlC涂层对不锈钢在0.01 mol/L H₂SO₄溶液中耐蚀性能的影响。结果表明：涂层致密均匀，主要由Cr₂AlC MAX相组成；沉积Cr₂AlC涂层后，304不锈钢的腐蚀电流密度为2.43×10^-7 A·cm^-2，下降了两个数量级；恒电位极化后，阳极和阴极的电流密度分别稳定在2.44×10^-8和2.3×10^-7 A·cm^-2；在腐蚀介质中的电荷转移电阻值高于10⁵ Ω·cm²，表明Cr₂AlC涂层在质子交换膜燃料电池模拟环境中具有良好的耐腐蚀性能。

关键词 ：质子交换膜燃料电池, Cr₂AlC, MAX相涂层, 金属双极板, 腐蚀性能

Abstract：

In this paper, Cr₂AlC phase coatings were deposited on 304 stainless steel bipolar plates by DC magnetron sputtering. The morphology and microstructure of the coating were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and its corrosion behavior in 0.01 mol/L H₂SO₄ solution was investigated by electrochemical methods. The results showed that the as-deposited Cr₂AlC coating was compact and uniform, mainly composed of Cr₂AlC phase. The corrosion current density of the coating was 2.43×10^-7 A·cm^-2, which was lower than that of 304 stainless steel by two orders of magnitude. After potentiostatic polarization at 600 and -240 mV_SCE, the corresponding current densities were 2.44×10^-8 and 2.3×10^-7 A·cm^-2, respectively. In addition, the impedance modulus of Cr₂AlC coating in 0.01 mol/L H₂SO₄ solution was higher than 10⁵ Ω·cm², indicating that the coating could provide excellent protection for 304 stainless steel bipolar plate of PEMFC.

Key words： PEMFC Cr₂AlC coatings bipolar plate corrosion resistance stainless steel

收稿日期: 2022-01-06 32134.14.1005.4537.2022.008

ZTFLH:

TG172

基金资助:国家自然科学基金(51771034);湖南省自然科学基金(2020JJ4610);长沙理工大学研究生科研创新项目(CX2020SS65)

作者简介: 刘云，女，1997年生，硕士生

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引用本文:

刘云, 任延杰, 陈荐, 周立波, 邱玮, 黄伟颖, 牛焱. 质子交换膜燃料电池不锈钢双极板表面Cr₂AlC涂层的制备与耐蚀性能[J]. 中国腐蚀与防护学报, 2023, 43(1): 62-68.
Yun LIU, Yanjie REN, Jian CHEN, Libo ZHOU, Wei QIU, Weiying HUANG, Yan NIU. Preparation and Corrosion Resistance of Ternary Layered Compound Cr₂AlC Coating on 304 Stainless Steel for Bipolar Plates of PEMFC. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 62-68.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.008 或 https://www.jcscp.org/CN/Y2023/V43/I1/62

图1 304不锈钢表面Cr2AlC MAX相涂层的表面和截面形貌

图2 304不锈钢表面Cr2AlC MAX相涂层的XRD图

图3 304不锈钢表面Cr2AlC涂层的XPS光谱图

图4 未沉积和沉积Cr2AlC涂层的304不锈钢样品在0.01 mol/L H2SO4中室温下的动电位极化曲线

图5 沉积Cr2AlC涂层的304不锈钢样品在模拟PEMFC阳极和阴极环境中的恒电位极化曲线

图6 沉积Cr2AlC涂层的304不锈钢在-240 mVSCE和600 mVSCE恒电位极化后的表面形貌

图7 未沉积和沉积Cr2AlC涂层的304不锈钢样品在0.01 mol/L H2SO4溶液中的开路电位-时间曲线

图8 未沉积及沉积Cr2AlC涂层的304不锈钢在0.01 mol/L H2SO4溶液中的电化学阻抗谱及其等效电路

表1 304不锈钢在0.01 mol/L H2SO4溶液中的电化学阻抗谱拟合结果

表2 沉积Cr2AlC涂层的304不锈钢在0.01 mol/L H2SO4溶液中的电化学阻抗谱拟合结果

图9 沉积Cr2AlC涂层的不锈钢在0.01 mol/L H2SO4溶液中腐蚀432 h后的表面形貌

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