摘要
采用直流磁控溅射技术在304不锈钢双极板表面沉积Cr_(2)AlC 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Cr_(2)AlC涂层对不锈钢在0.01 mol/L H_(2)SO_(4)溶液中耐蚀性能的影响。结果表明:涂层致密均匀,主要由Cr_(2)AlC MAX相组成;沉积Cr_(2)AlC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105Ω·cm^(2),表明Cr_(2)AlC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。
In this paper,Cr_(2)AlC 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 H_(2)SO_(4) solution was investigated by electrochemical methods.The results showed that the as-deposited Cr_(2)AlC coating was compact and uniform,mainly composed of Cr_(2)AlC 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 mVSCE,the corresponding current densities were 2.44×10^(-8)and 2.3×10^(-7)A·cm^(-2),respectively.In addition,the impedance modulus of Cr_(2)AlC coating in 0.01 mol/L H_(2)SO_(4) solution was higher than 105Ω·cm2,indicating that the coating could provide excellent protection for 304 stainless steel bipolar plate of PEMFC.
作者
刘云
任延杰
陈荐
周立波
邱玮
黄伟颖
牛焱
LIU Yun;REN Yanjie;CHEN Jian;ZHOU Libo;QIUWei;HUANGWeiying;NIU Yan(Department of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2023年第1期62-68,共7页
Journal of Chinese Society For Corrosion and Protection
基金
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)。
