电沉积法制备的泡沫镍的晶体结构与磁性能

 采用X射线衍射仪、振动样品磁强计分别测试了电沉积法制备的泡沫镍的晶体结构和磁性能，研究了电流密度、温度、占空比、脉冲频率对镍沉积层的晶体结构和磁性能的影响；并用扫描电子显微镜、透射电子显微镜观察了泡沫镍的组织结构与微观形貌。制备出的3维网络状泡沫镍密度为0.25 g/cm³，孔隙率为97.5%、孔径分布为400～500 μm。沉积层大颗粒粒径为1 μm，沉积层晶粒尺寸在10nm以下;泡沫镍为超顺磁材料，具有低的矫顽力和高的磁导率，其磁导率和饱和磁化强度随沉积层晶粒尺寸的增加而增大。     

Structures and their influence factors of three‐dimensional fractal cadmium layer formed by electrodeposition

Three‐dimensional fractal structure of the electrodeposited cadmium layer was investigated. The results suggested that the fractal growth begin with nanometer scale aggregate within which the atoms arrange in hexagonal close‐packed lattice (the normal cadmium lattice). The fractal structure is correlated to the current density. The higher the current density is, the larger the size of fractal growth will be. Fractal structures can emerge in both the complete diffusion‐limited process and the combination‐limited process of the electrochemical reaction and diffusion. The fractal structure obtained from the simple hydrated ion electrolyte is different from that obtained from the complex ion electrolyte, which indicates they grow in different modes. The fractal dimensionality of deposit from the simple hydrated ion electrolyte is 2.592, smaller than that (2.608) from the complex ion electrolyte.     

氢在电镀锌层中的扩散渗透性的研究

针对氢在镀锌层中的扩散渗透性，采用电化学氢渗透技术对Ｆｅ／电镀Ｚｎ双层试样进行了研究．得到了镀锌层的厚度对镀层氢扩散系数以及氢稳态渗透通量的影响方式．研究结果表明，电镀锌层中氢扩散系数约为１０－１１ｃｍ２·ｓ－１数量级，镀锌层能够阻滞氢的扩散渗透．相应地，随镀层厚度增大，试样氢稳态渗透通量和氢有效扩散系数减小     

电沉积ZrO2—Ni功能梯度材料的组织结构分析

电沉积ＺｒＯ２┐Ｎｉ功能梯度材料的组织结构分析①全成军＊向兴华朱景川尹钟大（哈尔滨工业大学材料科学与工程学院哈尔滨１５０００１）航空航天技术的高速发展对材料的耐热性能提出了更苛刻的要求，传统的单一材料（如陶瓷、金属）和金属陶瓷复合材料已难以在超高温和...     

电沉积技术制作高聚物微流控芯片模具

利用电沉积技术制作微流控芯片金属模具,方法是:使用新型超厚光刻胶SU8胶作近紫外光刻,并在光刻后的图案上电沉积金属Ni,之后去胶,最终获得金属模具.该法减小了电沉积工作量.采用反向电流预处理基底、并适当增加电铸液的添加剂以及脱模后真空退火,即可明显提高电沉积微结构与基底的结合力.用此金属模具成功热压了PMMA,制成了微流控芯片.     

Effects of Co and W alloying elements on the electrodeposition aspects and properties of nanocrystalline Ni alloy coatings

Depending on deposition current density and alloying elements, various types of surface structure (surface morphology and grain orientation) were observed for Ni and Ni alloy nanocrystalline coatings. It was found that the variation of surface morphology with current density is in a good agreement with the variation of grain orientation. An increase in the current density produced larger grains and also reduced the charge transfer resistance and growth inhibition intensity which may change the surface structure of the coatings. For Ni coatings, the effect of surface structure on the corrosion resistance was detected to be superior to that of grain size. In the case of Ni-Co coating and at different deposition current densities, Co content and surface structure were recognized as the major factors influencing the corrosion resistance. Surface structure was also a more important factor determining the corrosion resistance of Ni-W coatings. In Ni-Co-W coatings, surface structure and grain size of the coatings were found to be independent of deposition current density. This is believed to be due to the simultaneous contrary effects of Co and W elements.