垂直稳恒磁场下Fe-纳米Si颗粒复合电沉积  

Electrodeposition of Fe-nano-Si particle composite coatings in a perpendicular static magnetic field

作　　者：周鹏伟[1] 钟云波[1] 龙琼[1] 孙宗乾[1] 范丽君[1] 郑天祥[1] 周俊峰[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《北京科技大学学报》2014年第6期787-794,共8页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51034010)

摘　　要：在垂直稳恒磁场中采用纳米复合电沉积法制备Fe--Si复合镀层.研究了磁场强度和电流密度对阴极电流效率和镀层Si颗粒含量的影响规律,并采用扫描电子显微镜和能谱对所得镀层进行分析.施加垂直磁场后,随着磁场强度增大,阴极电流效率呈现先上升后下降的趋势;镀层Si颗粒质量分数在0.2T达到最大值20.17%,比无磁场下提高了10.4%;镀层表面形貌也发生显著变化,多处形成"山脊","山脊"延伸方向与磁流体力学效应方向一致,分布数量和延伸长度与磁场强度成正比.由于磁流体力学效应,施加磁场还改变了镀层表面气孔形貌,促进氢气的析出.Fe-Si composite coatings were prepared by nano-composite electroplating in a static magnetic field parallel to the electrode surface. The effects of magnetic flux density and current density on the cathode current efficiency and silicon content in the coatings were studied. The coatings were characterized by scanning electron microscopy and energy dispersive spectrometry. It is found that the cathode current efficiency first increases and then decreases with increasing magnetic flux density. The mass fraction of silicon in the coatings reaches its maximum value of 20. 17% at 0. 2 T, which increases by 10. 4% compared with that without any magnetic field. In addition, the smooth surface morphology of the coatings turns into “mountain ranges”, whose directions are the same to the direction of magnetohydrodynamic convection （MHD）. More and longer “mountain ranges” appear with increasing magnetic flux densi-ty. Owing to MHD effect, the magnetic field also influences the surface morphology of hydrogen pores and promotes the evolution of hydrogen.

关 键 词：复合镀层 电沉积 磁场 纳米颗粒 磁流体力学 硅钢 

分 类 号：TG174.44[金属学及工艺—金属表面处理]