氢燃料电池金属双极板表面TiC/a-C:H涂层的制备和表征  

Preparation and Characterization of TiC/a-C:H Coating on the Surface of Metal Bipolar Plates in Hydrogen Fuel Cells

作　　者：王浩琦 欧伊翔 华青松 李飞强 付薇 郑威龙 侯莉 王连才[2] 曾心苗[2] 徐云飞 曹季东 曲观书 Wang Haoqi;Ou Yixiang;Hua Qingsong;Li Feiqiang;Fu Wei;Zheng Weilong;Hou Li;Wang Liancai;Zeng Xinmiao;Xu Yunfei;Cao Jidong;Qu Guanshu(Key Laboratory of Beam Technology and Materials Modification of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China;Radiation Technology Institute,Beijing Academy of Science and Technology,Beijing 100875,China;Beijing SinoHytec Co.,Ltd,Beijing 100089,China)

机构地区：[1]北京师范大学核科学与技术学院射线束技术教育部重点实验室,北京100875 [2]北京市科学技术研究院辐射技术研究所,北京100875 [3]北京亿华通科技股份有限公司,北京100089

出　　处：《稀有金属材料与工程》2024年第9期2580-2587,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金面上项目(12275028);广东省重点研发计划(2019B090909002);北京市科学与技术研究院2023年财政项目创新工程和2023年创新培育项目;北京亿华通科技股份公司委托项目。

摘　　要：研究沉积离子能量对沉积在氢燃料电池金属双极板表面的TiC/a-C:H涂层导电性和耐腐蚀性能影响。通过磁过滤真空阴极弧沉积技术以Ti靶为Ti源,通入乙炔气体在–100~–500 V基体负偏压下于SS 304不锈钢和单晶硅表面沉积了厚度为0.52~1.05μm的TiC/a-C:H复合涂层,研究分析了涂层的微观结构、涂层成分、相结构、耐腐蚀性能和导电性能的变化规律。结果表明,在–100~–500 V基体负偏压下沉积的TiC/a-C:H复合涂层均呈现致密的低缺陷特征,涂层为非晶碳包覆的nc-TiC纳米晶所构建的纳米晶/非晶复合结构,随着负偏压增大,涂层中纳米晶尺寸从3.3nm增至7.9 nm。最优的nc-TiC/a-C:H涂层(负偏压–100 V)在模拟氢燃料电池腐蚀环境(80℃, 0.5 mol/L H_(2)SO_(4)+2μL/L HF水溶液)下实现了5.25×10^(-8)μA/cm^(2)的超低腐蚀电流密度,在1.4 MPa的压紧力下实现了1.49 mΩ/cm^(2)的极低ICR值。采用磁过滤真空阴极弧沉积法制备的nc-TiC/a-C:H涂层可以在宽的负偏压范围内有效提高SS 304不锈钢双极板的耐腐蚀和导电性,满足DOE 2025目标对氢燃料电池双极板的性能需求,该工作为大规模制备高性能金属双极板涂层开辟了一条新途径。The influences of deposition ion energy on the conductivity and corrosion resistance of TiC/a-C:H coatings deposited on metal bipolar plates for hydrogen fuel cells were investigated.TiC/a-C:H nanocomposite coatings with thickness of 0.52–1.05μm were deposited on SS 304 stainless steel and Si substrate under bias voltages from–100 V to–500 V by filtered cathodic vacuum arc deposition with Ti target in acetylene atmosphere.The microstructure,composition,phase structure,corrosion resistance,and conductivity of the coatings were studied and analyzed.The results show that the TiC/a-C:H nanocomposite coatings deposited under bias voltages from–100 V to–500 V exhibit dense and low-defect characteristics.The coatings are composed of nanocrystalline/amorphous composite structure built by nanocrystalline nc-TiC coated with amorphous carbon.The nanocrystal size in the coatings increases from 3.3 nm to 7.9 nm with the increase in the bias voltage from–100 V to–500 V.The optimal nc-TiC/a-C:H coating(bias voltage–100 V)achieves a very low corrosion current density of 5.25×10^(-8)μA/cm^(2) in a simulated hydrogen fuel cell corrosion environment(80°C,0.5 mol/L H_(2)SO_(4)+2μL/L HF solution)and an extremely low interfacial contact resistance(ICR)value of 1.49 mΩ·cm^(2) under 1.4 MPa compression force.The nc-TiC/a-C:H coatings prepared by filtered cathodic vacuum arc deposition can effectively improve the corrosion resistance and conductivity of SS 304 stainless steel bipolar plates over a wide range of bias voltages,meeting the performance requirements of DOE 2025 for hydrogen fuel cell bipolar plates.This work opens up a new pathway for the large-scale preparation of high-performance metal bipolar plate coatings.

关 键 词：金属双极板 纳米复合涂层 耐腐蚀 高导电率 nc-TiC/a-C:H 磁过滤真空阴极弧沉积 

分 类 号：TG174.4[金属学及工艺—金属表面处理]