【摘要】 通过Ni、W、P与CeO2、SiO2纳米颗粒的脉冲共沉积,在普通碳钢表面制备了Ni–W–P–CeO2–SiO2纳米复合镀层。在一定的脉冲频率和平均电流密度下,研究了正向脉冲占空比对纳米复合镀层的化学组成、沉积速率、显微硬度和显微组织的影响。结果表明:增大正向脉冲占空比时,纳米复合镀层的晶粒尺寸增大,沉积速率和显微硬度降低。当正向脉冲占空比控制在10%时,沉积速率最快(为48.6μm/h),显微硬度最高(为696HV)。纳米复合镀层中的P含量随着正向脉冲占空比的增大而增加,但CeO2、SiO2纳米颗粒及W的含量不断降低,正向脉冲占空比对W的沉积量影响最明显。更多还原

【Abstract】 A Ni–W–P–CeO2–SiO2 nanocomposite coating was prepared on normal carbon steel surface by pulse codeposition of Ni,W,P,nano-CeO2 and nano-SiO2 particles.The effect of positive pulse duty cycle on the chemical composition,deposition rare,microhardness and micro-structure of the nanocomposite coating was studied at constant pulse frequency and average current density.The results showed that the increase of positive pulse duty cycle leads to an increase in crystallite size of the nanocomposite coating but to a decrease in deposition rate and microhardness.A deposition rate of 48.6 μm/h and a microhardness of 696 HV were obtained at the positive pulse duty cycle of 10%.The increase of positive pulse duty cycle results in an increase in P content of the nanocomposite coating,but adecrease in the contents of W as well as CeO2 and SiO2 nanoparticles.Positive pulse duty cycle has the greatest effect on the deposition of W.更多还原