氧化铈膜制备及其耐腐蚀性能

Preparation and anti-corrosion performance of cerium oxide film

采用不同的制备溶液及制备参数在X80钢表面制备出不同的氧化铈膜,并对其耐腐蚀性能进行了研究。利用扫描电镜、能谱仪、XRD、拉曼光谱、接触角测试仪对不同的氧化铈膜腐蚀前后的表面形貌、元素、物相及亲水性进行了分析,利用电化学工作站对不同的氧化铈膜在3.5wt.%NaCl溶液中的开路电位、线性极化电阻、交流阻抗、极化曲线进行了研究。研究结果表明,制备溶液中的水会导致膜层出现龟裂现象,增强电流密度不会引起膜层龟裂;电流密度增强或时间增加均会增加电化学沉积膜的表面能;制备溶液中的水可以提高膜层的耐腐蚀性能,增强制备电流密度亦能明显提升其耐腐蚀性能,但涂层耐腐蚀性能对制备时间的影响不敏感。优化氧化铈膜制备参数可以明显提升其耐腐蚀性能。

Cerium oxide films on surface of X80 steel were prepared with different solutions and parameters,and their corrosion properties were investigated.The surface morphology,element,phase,and hydrophilicity of the film before and after corrosion were analyzed by using scanning electron microscopy(SEM),energy disperse spectroscopy(EDS),X-ray diffraction(XRD),Raman spectrum,and contact angle meter.The open circuit potential(OCP),linear polarization resistance(LPR),electrochemical impedance spectroscopy(EIS),and polarization curve(PC)of the film in 3.5 wt.%NaCl solution were obtained based on electrochemical workstation.Results show that H;O in solution caused cracking in the film,whereas the enhancement of current density did not cause such cracks.The surface energy of the film could be increased by enhancing current density or increasing preparation time.H;O in solution could improve the corrosion resistance of the film,and the corrosion resistance was also obviously improved by increasing current density,while preparation time had little effect on the anti-corrosion performance of the film.Optimizing preparation parameters of cerium oxide film can significantly improve its corrosion resistance.