Effect of different electrodeposition methods on oxidation resistance of Ni–CeO2 nanocomposite coating
Effect of different electrodeposition methods on oxidation resistance of Ni–CeO2 nanocomposite coating
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DOI：
10.1016/j.surfcoat.2010.04.009
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发表时间：
2010-08
影响因子：
5.4
通讯作者：
Y. Xue;Hong Bin Liu;Ming-Ming Lan-Ming;Jishun Li;Hang Li
中科院分区：
文献类型：
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作者：
Y. Xue;Hong Bin Liu;Ming-Ming Lan-Ming;Jishun Li;Hang Li
分别采用直流电沉积（DC）、脉冲电沉积（PC）和超声脉冲电沉积（PC+超声）制备了纯Ni和Ni-CeO 2纳米复合镀层。对比研究了3种Ni-CeO 2纳米复合涂层在800°C下的抗氧化性能。采用扫描电子显微镜（SEM）、能谱仪（EDAX）、透射电子显微镜（TEM）和X射线衍射仪（XRD）对3种纳米复合涂层氧化前后的微观结构进行了表征。结果表明，电沉积方法对Ni-CeO 2纳米复合镀层和纯Ni镀层的显微结构和抗氧化性能有显著影响。对于相同的电沉积方法，Ni-CeO 2纳米复合镀层的抗氧化性明显优于纯Ni镀层的抗氧化性上级。与DC纳米复合涂层和PC纳米复合涂层相比，PC+超声纳米复合涂层具有更细的晶粒，并表现出上级抗氧化性。CeO 2纳米粒子在镀层中的分散和电沉积过程中的超声搅拌综合作用，对纳米复合镀层的晶粒细化起到了促进作用。同时，超声搅拌进一步促进了共沉积CeO 2纳米颗粒的晶粒细化效果。由于CeO 2纳米粒子的均匀分散和晶粒的细化，Ni-CeO 2纳米复合镀层的抗氧化性能得到显著提高。
Pure Ni and Ni–CeO2nanocomposite coatings were prepared by direct current electrodeposition (DC) and pulse current electrodeposition (PC) and pulse current electrodeposition with ultrasound (PC+ultrasound), respectively. The oxidation resistance at 800°C of three Ni–CeO2nanocomposite coatings were comparatively investigated. The microstructure of the three nanocomposite coatings before and after oxidation was characterized using scanning electron microscopy (SEM) with EDAX, transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results show that the electrodeposition methods can significantly affect the microstructure and the oxidation resistance of Ni–CeO2nanocomposite coatings and those of the pure Ni coatings. For the same electrodeposition methods, the oxidation resistance of the Ni–CeO2nanocomposite coatings is clearly superior to the pure Ni coatings. The PC+ultrasound nanocomposite coating has finer grains and exhibits a superior oxidation resistance compared to the DC nanocomposite coating and also the PC nanocomposite coating. The dispersed CeO2nanoparticles in the coating and the ultrasound agitation during electrodeposition synthetically contribute to the grain refinement of the nanocomposite coatings. Meanwhile, ultrasound agitation further promotes the grain refinement effect of the co-deposited CeO2nanoparticles. Significant improvement in oxidation resistance of Ni–CeO2nanocomposite coatings can be attributed to the homogeneously dispersed CeO2nanoparticles and the finer-grained structure.