硬脂酸改性镁合金铈钒转化膜的制备与性能  

Fabrication and Characterization of Stearic Acid Modified Ce-V Conversion Coating on Magnesium Alloy

作　　者：蒋晓[1,2] 郭瑞光[1] 唐长斌[3] JIANG Xiao GUO Rui-guang TANG Chang-bin(School of Environmental and Municipal Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055, China School of Environmental Science and Engineering, China West Normal University, Nanchong 637009, Sichuan, China School of Metallurgy and Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055, China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西华师范大学环境科学与工程学院,四川南充637009 [3]西安建筑科技大学冶金工程学院,西安710055

出　　处：《材料工程》2017年第5期13-19,共7页Journal of Materials Engineering

基　　金：国家自然科学基金项目(20976143)

摘　　要：采用硬脂酸对镁合金铈钒转化膜进行改性处理。利用扫描电镜、接触角测试仪、X射线能谱仪和红外光谱仪对改性膜层的微观结构、表面润湿性能以及化学组成进行分析,并通过防黏附和电化学实验研究膜层的自清洁行为以及耐腐蚀性能。结果表明:硬脂酸对铈钒转化膜的改性处理,不仅对转化膜的裂纹起到修补作用,并且通过接枝硬脂酸的疏水长链使改性膜层表面转化为超疏水性。8h常温浸泡后得到的改性膜层,表面接触角达154.6°,并表现出良好的自清洁性;耐腐蚀能力与原铈钒转化膜相比,膜层电阻R_(coat)提高25倍,自腐蚀电流密度i_(corr)降低2个数量级,其耐蚀性能得到显著提升。The Ce-V conversion coating on magnesium alloy was modified by stearic acid （SA）. Scanning electronic microscope （SEM）, contact angle measurement, energy dispersive X-ray spectroscopy （EDS） and Fourier transform infrared spectrometer （FTIR） were adopted to study the microstructure, surface wettability, and chemical composition of the modified coating. Self-cleaning behavior and corrosion resistance of the coating were investigated by anti-adhesion and electrochemical experiments, respectively. The results show that the SA modification treatment not only repairs the cracks of the conversion coating, but also renders a superhydrophobic surface by grafting the long alkyl chains onto the rough Ce-V conversion coating. After 8h of treatment at room temperature, the modified coating surface with a contact angle of 154.6° exhibits good self-cleaning property. The modified coating increases the corrosion resistance （Rcoat） by 25 times and decreases the corrosion current density （icorr） by 2 orders of magnitude compared to the Ce-V conversion coating. The modified coating significantly improves corrosion resistance.

关 键 词：镁合金  硬脂酸  转化膜  超疏水  耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]