CAJ | 학술논문

　　向普通电镀液中加入不同含量平均颗粒尺寸为7 nm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10~30 nm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。
　　향보통전도액중가입불동함량평균과립척촌위7 nm적CeO2과립，재Ni표면복합전도불동CeO2과립함량적 Ni?CeO2납미복합도층。연구표명，CeO2납미과립미산분포재10~30 nm적 Ni 중。위료료해온도화 CeO2과립함량대Ni?CeO2납미복합도층양화성능적영향규률，대량충불동CeO2과립함량적Ni?CeO2납미복합도층화보통Ni도층진행불동온도하적항온양화대비실험。양화실험결과표명：재800°C시，CeO2억제료Ni연정계외확산，종이명현증강료Ni?CeO2납미복합도층적양화성능；연이，재1050°C화1150°C시，유우Ni향외적체확산공제Ni적양화과정，차시CeO2대제고Ni?CeO2납미복합도층적양화성능작용경미；차외，CeO2과립함량대Ni?CeO2납미복합도층적양화성능무명현영향。
Ni?CeO2 nanocomposite coatings with different CeO2 contents were prepared by codeposition of Ni and CeO2 nanoparticles with an average particle size of 7 nm onto pure Ni surfaces from a nickel sulfate. The CeO2 nanoparticles were dispersed in the electrodeposited nanocrystalline Ni grains (with a size range of 10?30 nm). The isothermal oxidation behaviours of Ni?CeO2 nanocomposite coatings with two different CeO2 particles contents and the electrodeposited pure Ni coating were comparatively investigated in order to elucidate the effect of CeO2 at different temperatures and also CeO2 contents on the oxidation behaviour of Ni?CeO2 nanocomposite coatings. The results show that the as-codeposited Ni?CeO2 nanocomposite coatings have a superior oxidation resistance compared with the electrodeposited pure Ni coating at 800 °C due to the codeposited CeO2 nanoparticles blocking the outward diffusion of nickel along the grain boundaries. However, the effects of CeO2 particles on the oxidation resistance significantly decrease at 1050 °C and 1150 °C due to the outward-volume diffusion of nickel controlling the oxidation growth mechanism, and the content of CeO2 has little influence on the oxidation.