Fe-Co alloys have the advantages of high saturation magnetization and high magnetic elongation. They are used in electromagnet pole heads, earphone vibration films, magnetostriction transducers, and so on. At present, few papers have been published on the co-deposition process of Fe-Co alloys. In the present work, smooth dense Fe-Co films of 10 μm were successfully prepared in an economical, green, sulfate solution system via electrodeposition. The cathodic polarization curves were measured separately under different conditions, and the electrochemical analyses showed that the increase in the main salt concentration is beneficial for obtaining higher deposition rates. An increase in temperature can increase the current density of electrochemical reduction of Fe2+, and 50 °C is a suitable temperature at which to prepare the Fe-deposited layer with a flat surface. The increase in Co2+ concentration can favor the co-electrodeposition process of Fe-Co alloys. Secondly, the EDS results showed that the mass fraction of Co in the films increased linearly with the increase in Co2+ concentration in the solution. The mass fraction of Co in the films gradually increased with the increase in current density. The mass fraction of Co in the films gradually decreased with the increase in (NH4)2SO4 concentration. In addition, the XRD showed that the grain size of the Fe-Co alloy films was closely related to the concentration of (NH4)2SO4 in the electrolyte, and the smallest crystallite size of the Fe-Co alloy film was 17 nm. SEM showed that (NH4)2SO4 can significantly affect the surface morphology of the films, in which the cracks are obviously removed.

中文翻译：

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(NH4)2SO4对Fe-Co合金成分和结构的影响机理

Fe-Co合金具有高饱和磁化强度和高磁伸长率的优点。用于电磁铁磁极头、耳机振膜、磁致伸缩换能器等。目前，关于Fe-Co合金共沉积工艺的论文很少见。在目前的工作中，通过电沉积在经济、绿色的硫酸盐溶液系统中成功制备了 10 μm 的光滑致密 Fe-Co 薄膜。分别测量了不同条件下的阴极极化曲线，电化学分析表明主盐浓度的增加有利于获得更高的沉积速率。温度升高可以增加电化学还原Fe2+的电流密度，50 °C 是制备具有平坦表面的 Fe 沉积层的合适温度。Co2+浓度的增加有利于Fe-Co合金的共电沉积过程。其次，EDS结果表明，随着溶液中Co2+浓度的增加，薄膜中Co的质量分数呈线性增加。随着电流密度的增加，薄膜中Co的质量分数逐渐增加。随着(NH4)2SO4浓度的增加，薄膜中Co的质量分数逐渐降低。此外，XRD表明Fe-Co合金薄膜的晶粒尺寸与电解液中(NH4)2SO4的浓度密切相关，Fe-Co合金薄膜的最小微晶尺寸为17 nm。SEM表明，(NH4)2SO4可以显着影响薄膜的表面形貌，