电化学法制备Fe/Pt多层膜的工艺研究

Technique Research of Electrodeposited Fe/Pt Multilayer Coatings

摘要:

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–2 V，沉积6 min和富铁层沉积电位为–5 V，沉积3 min，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30 min之后，其矫顽力从5.12 kA/m增大至42.18 kA/m，饱和磁化强度从43.1 kA/m增大至459.1 kA/m。

Abstract:

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.