通过Ni,W,P与CeO2,SiO2纳米颗粒的双脉冲电沉积,在普通碳钢表面制备了Ni-W-P/CeO2-SiO2纳米复合材料沉积层.在正、反向脉冲占空比(10%,30%)和正、反向脉冲平均电流密度(15.0,1.5 A/dm2)恒定下,研究了正、反向脉冲时间对纳米复合材料电沉积的影响.采用能谱、硬度测试和扫描电镜等方法,对纳米复合材料沉积层的化学组成、沉积速率、显微硬度和表面形貌进行了表征.结果表明:当正、反向脉冲时间分别控制在300 ms和40 ms时,Ni-W-P基质金属轮廓清晰,晶粒细小而均匀,CeO2和SiO2纳米颗粒在基质金属中均匀弥散分布;沉积层的化学组成(质量分数)为:70.89%Ni,9.89%W,8.59%P,7.35%CeO2,2.81%SiO2;沉积速率为45.1μm/h,显微硬度为706 HV.
Ni-W-P/CeO2-SiO2 nanocomposite coatings were prepared on the surface of carbon steel by dual pulse co-deposition of Ni, W, P and particles of nano-CeO2 and nano-SiO2. The influence of positive and negative pulse working time on the electredeposition of the nanocomposite was researched at constant positive and negative pulse duty cycles of 10% and 30 % and constant average pulse current densities of 15.0 A/dm2 and 1.5 A/dm2. The microhardness of the coatings was measured by using a microhardness meter, while the composition, deposi-tion rate and surface morphology of the coatings were analyzed by means of scanning electron microscopy and energy dispersive spectrometry. Results show that when the positive and negative pulse working time is controlled at 300 ms and 40 ms respective-ly, the resulting nanocomposite coating possesses clear outline of Ni-W-P matrix metal crystallite, fine and uniform crystals, as well as uniform distribution of nano-CeO2 and nano-SiO2 parti-cles within the matrix metal. The chemical composition of the coating was determined to be 70. 89% Ni, 9. 89% W, 8.59% P, 7.35% CeO2 and 2.81% SiO2(mass fraction) , and the dep-osition rate and microhardness of the coating were determined to be 45.1 μm/h and 706 HV.
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