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向普通电镀液中加入不同含量平均颗粒尺寸为7nm的CeO2颗粒,在Ni表面复合电镀不同CeO2颗粒含量的Ni-CeO2纳米复合镀层。研究表明,CeO2纳米颗粒弥散分布在10~30nm的Ni中。为了了解温度和CeO2颗粒含量对Ni-CeO2纳米复合镀层氧化性能的影响规律,对两种不同CeO2颗粒含量的Ni-CeO2纳米复合镀层和普通Ni镀层进行不同温度下的恒温氧化对比实验。氧化实验结果表明:在800°C时,CeO2抑制了Ni沿晶界外扩散,从而明显增强了Ni-CeO2纳米复合镀层的氧化性能;然而,在1050°C和1150°C时,由于Ni向外的体扩散控制Ni的氧化过程,此时CeO2对提高Ni-CeO2纳米复合镀层的氧化性能作用轻微;此外,CeO2颗粒含量对Ni-CeO2纳米复合镀层的氧化性能无明显影响。
CeO2 particles with different content and average particle size of 7nm were added to ordinary plating solution, Ni-CeO2 nano-composite coatings with different CeO2 particles content were electroplated on Ni surface. Studies have shown that CeO2 nanoparticles dispersed in 10 ~ 30nm Ni. In order to understand the influence of temperature and CeO2 content on the oxidation performance of Ni-CeO2 nano-composite coatings, two kinds of Ni-CeO2 nano-composite coatings with different CeO2 content and common Ni coatings were compared at different temperatures. The results of oxidation experiments show that at 800 ° C, CeO2 inhibits the out-diffusion of Ni along the grain boundaries, which significantly enhances the oxidation performance of Ni-CeO2 nano-composite coatings. However, at 1050 ° C and 1150 ° C, Of the body diffusion control of Ni oxidation process, when CeO2 to improve the oxidation performance of Ni-CeO2 nano-composite coating slightly; In addition, CeO2 particles on the Ni-CeO2 nano-composite coating oxidation performance no significant effect.