强磁场下Ni/Al_2O_3纳米复合镀层制备及性能  

Preparation and Properties of Ni/Al_2O_3 Nano-Composite Coatings in High Magnetic Field

作　　者：冯秋元[1] 李廷举[1] 张忠涛[1] 张剑[1] 刘美[1] 金俊泽[1] 

机构地区：[1]大连理工大学三束材料改性国家重点实验室及材料科学与工程学院,大连116024

出　　处：《纳米技术与精密工程》2007年第3期215-219,共5页Nanotechnology and Precision Engineering

基　　金：国家自然科学基金资助项目(50234020;50474055)

摘　　要：施加强磁场用直流电镀法在Q235钢基体上成功制备了Ni/Al2O3纳米复合镀层.结果表明,随着磁感应强度的增大,镀层中纳米微粒含量增加,形成的纳米复合镀层均匀致密;当磁感应强度为8.0 T时,所得复合镀层的硬度比纯镍镀层提高2.3倍,而磨损率仅为纯镍镀层的24.5%.磨损表面形貌分析表明纯镍镀层的磨损机制为黏着磨损,而纳米复合镀层的磨损机制为磨粒磨损.强磁场通过洛仑兹力导致的磁流体动力使镀液产生涡流,宏观上形成对流,对镀液起搅拌作用,进而影响镀层性能.Ni/Al2O3 nano-composite coatings were prepared on Q235 steel using direct current electroplating in high magnetic field. The results show that the nano-contents of nano-particles increase with increasing of magnetic flux density, the layer of the nano-composite coatings becomes more uniform and compact. The microhardness of nano-composite coatings increases by 2.3 times and its wear resistance is only 24.5 % that of pure nickel coating when the magnetic flux density is 8.0 T. Observation of the morphology of the worn surfaces indicates that the pure nickel coating is characterized by adhesive wear, while the nano-composite coating is characterized by abrasive wear. An eddy motion on a microscopic scale could be generated in plating bath due to magnetohydrodynamics （MILD） induced by Lorentz force in high magnetic field. It forms convection in macroscopic to agitate the plating bath, and influences the properties of coatings.

关 键 词：强磁场 复合电镀 纳米Α-AL2O3 硬度 耐磨性 

分 类 号：TQ153[化学工程—电化学工业]