电沉积和热致合金化联用技术制备铁基合金箔

金属合金箔材料已经在电工电子、二次电池和包装等领域得到了广泛应用。电沉积是一种低价批量制备超薄金属箔不可多得的方法。然而在连续电沉积制备合金箔过程中遇到合金组分难以精确控制的问题，尤其当合金中各元素的标准电位相差较大时，更难控制合金组分，因此合金箔的电沉积制备未得到广泛应用。表面合金化是一种常用的金属表面改性技术，这种技术能在金属表面获得具有结构或组分新颖的合金。本项目拟以电沉积方法制备各层厚度可控的M/Fe/M三层箔，再利用热致合金化技术使Fe-M之间发生合金化，最终获得组分可控的铁基合金箔。系统研究热致合金化过程，揭示温度、时间和铁箔结构等参数与金属原子的扩散速度的规律，建立热扩散动力学模型，阐明超薄镀层间热致合金化的机理。

Alloy foils have been widely used in electrician and electronic industries, secondary batteries, packaging fields and so on. Electrodeposition is a unique method to largely produce super-thin metallic foils at low cost. However, it is difficult to precisely control the composition of alloy foils during continuous electrodeposition, especially when the difference between standard potentials of respective metal ions/metal contained the alloy foils is greater. Herein, alloy electrodeposition is restricted in its applications to fabricate corresponding alloy foils. As a conventional surface-modification technique, surface alloying is usually used to enhance surface properties of metals through forming functional alloys with new structure or composition. A novel method is proposed in this project, integrating with these two above technologies. Tri-layer M/Fe/M foils are prepared by electrodepositing M on electroformed Fe foils, and then became Fe-M alloy foils through a surface thermo-alloying technology. The effect of temperature, time and structures of Fe foils on diffusion rate of metal atoms between M/Fe/M will be studied in detail, the dynamics model will be given, and a mechanism about thermo-alloying of Fe and M will be also proposed.