脉冲时间对Ni-W-P-CeO2-SiO2纳米复合镀层特性的影响

稀有金属材料与工程, 2009, 38(z1): 579-583.

脉冲时间对Ni-W-P-CeO2-SiO2纳米复合镀层特性的影响

1.昆明理工大学,云南,昆明,650093

2.昆明理工大学,云南,昆明,650093

3.昆明理工大学,云南,昆明,650093

4.昆明理工大学,云南,昆明,650093

基金项目: Applied Basic Research Plans Program of Yunnan Province(2007E187M) Analysis and Measurement Research Fund of Kunming University of Science and Technology(2008-003) Scientific Research Fund of Yunnan Provincial Education Department(08C0025) 国家自然科学基金(20806035)

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

Influence of Pulse Times on the Characteristics of Ni-W-P-CeO2-SiO2 Nano-composite Coatings

Xu Ruidong ^1, , Wang Junli ^2, , Guo Zhongcheng ^3, , Wang Hua ^4,

1.昆明理工大学,云南,昆明,650093

2.昆明理工大学,云南,昆明,650093

3.昆明理工大学,云南,昆明,650093

4.昆明理工大学,云南,昆明,650093

Keywords： Ni-W-P-CeO2-SiO2 nano-composite coatings , pulse parameters , electrodeposition , microhardness , microstructure

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.纳米复合镀层显策硬度最高,为6890 MPa.当脉冲关断时间控制在1000 μs时,纳米复合镀层晶粒尺寸随脉冲导通时间(100～400 μs)的增加而降低,但若脉冲导通时间(400～1000 μs)继续增加,晶粒尺寸又开始增大.当脉冲导通时间控制在100 μs时,增加脉冲关断时间(100～4000 μs),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/din2),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 1000～400 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.

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