电化学法制备Fe/Pt多层膜的工艺研究

Technique Research of Electrodeposited Fe/Pt Multilayer Coatings

通过电化学沉积法制备Fe/Pt多层膜。分别以FeSO4.7H2O和H2PtCl6.6H2O作为Fe2+源和Pt4+源,配置Fe/Pt摩尔浓度比为100:1混合溶液,调整其pH值为2.5。然后以铂片为阳极,以纯铜片为阴极,接通脉冲电源,调节电位、换向时间等参数实现Fe、Pt的反复沉积,获得Fe/Pt多层膜。结果表明,变换富Fe层沉积电位对多层膜的表面形貌有一定影响。在富铂层沉积电位为-2V,沉积6min和富铁层沉积电位为-5V,沉积3min,循环4个周期得到的多层膜的Fe/Pt原子比接近3:1。将此多层膜在550℃热处理30min之后,其矫顽力从5.12kA/m增大至42.18kA/m,饱和磁化强度从43.1kA/m增大至459.1kA/m。

Fe/Pt multiplayer coatings were prepared via an electrodeposition process,where FeSO4.7H2O and H2PtCl6.6H2O solution were used as Fe2＋source and Pt4＋source,respectively,and Fe/Pt=100：1,pH=2.5.Then Platinum chip and pure copper chip were used as anode and cathode,respectively,in the above mixture solution.The Fe/Pt multiplayer coatings were obtained through adjusting the parameters of pulse potential which results in the deposits of Fe and Pt reduplicatively.The results show that the surface morphologies of the Fe/Pt multiplayer coatings changes with the variety of Fe-rich layer potentials.The Fe/Pt multiplayer coatings,where the Fe/Pt ratio is close to 3：1,have been prepared in the conditions of-2 V,6 min for the Pt-rich layer,-5 V,3 min for Fe-rich layer,and 4-cycle deposits.The coercivity and saturation magnetization of the as-prepared multiplayer coatings increase from 5.12 kA/m to 42.18 kA/m and from 43.1 kA/m to 459.1 kA/m,respectively,after annealing at 550 °C for 30 min.