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316L不锈钢双极板磁控溅射不同厚度石墨涂层的耐蚀性和导电性

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  • 上海大学材料科学与工程学院
汪宏斌(1970-),博士,副研究员,主要从事金属双极板涂层改性工作,电话:66136526,E-mail:whb@shu.edu.cn

收稿日期: 2021-10-30

  修回日期: 2021-11-23

  录用日期: 2021-12-29

  网络出版日期: 2023-12-27

基金资助

上海工程技术研究中心建设项目(19DZ2252900)资助

Corrosion Resistance and Conductivity of Graphite Coatings with Different Thickness Deposited on 316L Stainless Steel Bipolar Plate by Magnetron Sputtering

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  • School of Material Science and Engineering, Shanghai University, Shanghai 201900, China

Received date: 2021-10-30

  Revised date: 2021-11-23

  Accepted date: 2021-12-29

  Online published: 2023-12-27

摘要

为了提高316L不锈钢双极板的耐蚀性和导电性,使用磁控溅射的方法,通过控制石墨靶材的溅射时间,在316L不锈钢表面沉积了不同厚度的石墨涂层,比较不同厚度石墨涂层的性能,以确定最佳厚度的石墨涂层。使用扫描电子显微镜(SEM)观察了双极板腐蚀后的微观表面形貌;模拟了质子交换膜燃料电池(PEMFC)双极板的工作环境,使用电化学测试方法测试了5种涂层的耐蚀性;通过X射线光电子能谱(XPS)分析了4种石墨涂层的C键结合特性;比较了几种涂层的界面接触电阻(ICR);测量了涂层的表面接触角来评估涂层的亲疏水性。结果表明:所有的涂层均能提高316L不锈钢的耐腐蚀性和导电性;其中以C-3石墨涂层最佳,恒电位极化下的腐蚀电流密度稳定在2.26×10-7 A/cm2;界面接触电阻(ICR)在5.6 mΩ·cm2;C-3和C-4有着较高的sp2杂化原子比例,得到了最佳厚度的石墨涂层,大概在400 nm。

本文引用格式

周清欢, 宓保森, 蔡锦钊, 陈卓, 汪宏斌 . 316L不锈钢双极板磁控溅射不同厚度石墨涂层的耐蚀性和导电性[J]. 材料保护, 2022 , 55(4) : 1 -6 . DOI: 10.16577/j.issn.1001-1560.2022.0087

Abstract

In order to improve the corrosion resistance and conductivity of 316L stainless steel bipolar plate, the magnetron sputtering was employed to deposit the graphite coatings with different thickness on the surface of 316L stainless steel trough controlling the sputtering time of graphite target. The optimal thickness of graphite coatings was determined by the comparison of the property of graphite coatings with different thickness. In addition, the surface micro morphology of the bipolar plate after corrosion was observed by scanning electron microscope (SEM). Under the simulation of work environment of proton exchange membrane fuel cell (PEMFC) bipolar plate, the corrosion resistance of five kinds of coatings was tested by electrochemical test method. X-ray photoelectron spectroscopy (XPS) was used to analyze the C-bonding characteristics of four kinds of graphite coatings. Moreover, the interfacial contact resistance (ICR) of several kinds of coatings was compared, and the surface contact angle of the coatings was measured to evaluate the hydrophilicity and hydrophobicity of the coatings. Results showed that all the coatings could improve the corrosion resistance and conductivity of 316L stainless steel. Among them, C-3 graphite coating was the best, the corrosion current density under constant potential polarization was stable at 2.26 × 10-7A/cm2, and the interface contact resistance (ICR) was 5.6 mΩ·cm2. Besides, C-3 and C-4 had a high proportion of sp2 hybrid atoms, and the optimal thickness of graphite coating was about 400 nm.
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