脉冲时间对Ni-W-P-CeO_2-SiO_2纳米复合镀层特性的影响(英文)  

Influence of Pulse Times on the Characteristics of Ni-W-P-CeO_2-SiO_2 Nano-composite Coatings

作　　者：徐瑞东[1] 王军丽[1] 郭忠诚[1] 王华[1] 

机构地区：[1]昆明理工大学,云南昆明650093

出　　处：《稀有金属材料与工程》2009年第A01期579-583,共5页Rare Metal Materials and Engineering

基　　金：Projects supported by National Natural Science Foundation of China(20806035);Applied Basic Research Plans Program of Yunnan Province(2007E187M);Scientific Research Fund of Yunnan Provincial Education Department(08C0025);Analysis and Measurement Research Fund of Kunming University of Science and Technology(2008-003)

摘　　要：采用方波脉冲电流电沉积了含有CeO2、SiO2纳米颗粒掺杂的Ni-W-P合金镀层。在脉冲峰值电流密度恒定(30A/dm2)下,研究了脉冲导通时间和脉冲关断时间对纳米复合镀层特性的影响,采用化学组成、显微硬度和微观组织进行表征。结果表明:通过Ni、W、P和CeO2、SiO2纳米颗粒的脉冲共沉积,在普通碳钢表面制备了具有细晶结构的Ni-W-P-CeO2-SiO2纳米复合镀层。当脉冲导通时间和脉冲关断时间均控制在100μs时,纳米复合镀层显微硬度最高,为6890MPa。当脉冲关断时间控制在1000μs时,纳米复合镀层晶粒尺寸随脉冲导通时间(100～400μs)的增加而降低,但若脉冲导通时间(400～1000μs)继续增加,晶粒尺寸又开始增大。当脉冲导通时间控制在100μs时,增加脉冲关断时间(100～4000μs),纳米复合镀层晶粒尺寸增大。Square-wave pulse current was used to electrodeposit Ni-W-P alloy coating containing nano-CeO2 and nano-SiO2 particles. At constant pulse peak current density （30 A/dm^2）, the influence of pulse on-times and pulse off-times on the characteristics was researched, the characteristics were assessed by chemical compositions, microhardness and microstructures The results showed that pulse co-deposition of Ni, W, P, nano-CeO2 and nano-SiO2 particles led to Ni-W-P-CeO2-SiO2 nano-composite coatings in fine-grained structure on common carbon steel. When the pulse on-time and pulse off-time were both controlled at 100 μs, the highest microhardness of 6890 MPa was obtained. At constant pulse off-time （1000 μs）, the crystal size of the nano-composite coating decreased with increasing the pulse on-time of 100-400 μs before it started to increase with further increasing the pulse on-time of 400-1000 μs. At constant pulse on-time （100 μs）, increasing the pulse off-time of 100-4000 μs resulted in a progressive increase of the crystal size of the nano-composite coatings.

关 键 词：Ni-W-P-CeO2-SiO2纳米复合镀层 脉冲参数 电沉积:显微硬度:微观组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]