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分别用纳米颗粒Cr(平均尺寸62 nm),Al(平均尺寸85nm)和微米颗粒Cr和Al(平均尺寸3μm)复合电沉积制备Ni-11Cr-3Al纳米复合镀层(ENC)和Ni-11Cr-7Al微米复国镀层(EMC)。纳米颗粒的复合使ENC Ni-11Cr-3Al比EMC Ni-11Cr-7Al的颗粒分布更加均匀,颗粒间距减小近25倍。900℃,24h恒温氧化实验表明,ENC Ni-11Cr-3Al与EMC Ni-11Cr-7Al相比氧化速率显著降低。这是由于其快速形成一层连续、致密的Cr_2O_3膜,进而促进其下Al_2O_3膜的快速形成所致。
The Ni-11Cr-3Al nanocomposite coatings (ENC) and Ni-11Cr-7Al (NiCr-3Al) were deposited by electrodeposition of Cr nanoparticles with the average size of 62 nm, Al nanoparticles with the average size of 85 nm and Cr and Al particles with the average size of 3 μm respectively. Micron plating (EMC). Nanocomposite nanoparticles make ENC Ni-11Cr-3Al more uniform than that of EMC Ni-11Cr-7Al, and the particle spacing is reduced nearly 25 times. The results of constant temperature oxidation at 900 ℃ for 24h showed that the oxidation rate of ENC Ni-11Cr-3Al was significantly lower than that of EMC Ni-11Cr-7Al. This is due to its rapid formation of a continuous, dense Cr 2 O 3 film, thereby promoting the rapid formation of its Al 2 O 3 film.