高温抗氧化性
(1. 河南科技大学 机电工程学院，洛阳 471003；
2. 河南科技大学 河南省机械设计及传动系统重点实验室，洛阳 471003)
摘 要: 在脉冲电沉积过程中通过施加超声波制备Ni-CeO2纳米复合镀层，利用SEM、XRD等分析方法，研究Ni-CeO2纳米复合镀层的高温抗氧化性能。结果表明：共沉积的CeO2纳米颗粒使基质金属Ni的晶粒尺寸减小，而超声波的引入进一步促使晶粒细化；弥散分布在镀层中的CeO2纳米颗粒有效降低纳米复合镀层氧化质量的增量；纳米颗粒以及超声波的晶粒细化作用均显著提高纳米复合镀层的高温抗氧化性能；与无超声作用相比，超声条件下脉冲电沉积制备的Ni-CeO2纳米复合镀层晶粒细小、氧化质量的增量少；在CeO2添加量为40 g/L时，所制备的纳米复合镀层的高温抗氧化性能最高。
关键字: CeO2纳米颗粒；纳米复合镀层；脉冲电沉积；超声波；高温抗氧化性能
Ni-CeO2 nanocomposite coatings by
pulse electrodeposition under ultrasound condition
（1. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. Henan Key Laboratory for Machinery Design and Transmission System,
Henan University of Science and Technology, Luoyang 471003, China）
Abstract:The Ni-CeO2 nanocomposite coatings were prepared by pulse electrodeposition with the imposition of ultrasound. The high temperature oxidation resistance of the Ni-CeO2 nanocomposite coatings was investigated by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results indicate that the co-deposited CeO2 nanoparticles in coatings reduce the grain sizes of metal matrix Ni, and the introduce of ultrasound further refines Ni grains. The CeO2 nanoparticles dispersed in coatings effectively decrease the mass increment of the nanocomposite coatings after oxidation. The significant improvement in high temperature oxidation resistance of the nanocomposite coatings is attributed to the refinement of Ni electrocrystalline grains due to co-deposited CeO2 nanoparticles as well as the aid of ultrasound during electrodeposition process. The Ni-CeO2 nanocomposite coatings prepared under ultrasound condition have smaller grains and lower mass increment than those prepared without ultrasound. The Ni-CeO2 nanocomposite coating with 40 g/L CeO2 nanoparticles due to the aid of ultrasound exhibits a maximal oxidation resistance at high temperature.
Key words: CeO2 nanoparticles; nanocomposite coatings; pulse electrodeposition; ultrasound; high temperature oxidation resistance
