正向脉冲占空比对Ni–W–P–CeO_2–SiO_2纳米复合镀层性能的影响  

Effect of positive pulse duty cycle on properties of Ni–W–P–CeO_2–SiO_2 nanocomposite coating

作　　者：胡双丽[1] 徐瑞东[1] 郭忠诚[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093

出　　处：《电镀与涂饰》2009年第1期4-6,20,共4页Electroplating & Finishing

基　　金：国家自然科学基金(20806035);云南省应用基础研究计划(2007E187M);云南省教育厅科学研究基金(08C0025);昆明理工大学科学研究基金(2006-02);分析测试重点基金(2008-003)。

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。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 microstructure 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 a decrease 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.

关 键 词：碳钢 镍-钨—磷合金 二氧化铈 二氧化硅 纳米复 合镀层 脉冲电沉积 沉积速率 显微硬度 

分 类 号：TQ153.2[化学工程—电化学工业]