Abstract:

Fe-Ni-S alloy film was prepared on red copper foil by electrodeposition from a acidic bath containing boric acid as a buffer agent and sodium citrate as a complexing agent. The effects of the bath composition, and the deposition parameters on the surface morphology and the composition of the alloy coating were studied by SEM and EDS. As a result, a smooth coating with no crack and little stress was obtained from the plating bath by adding 2 g/L saccharin and 0.4 g/L 1,4-butynediol. The cathodic current density and the plating bath pH have little effect on the coating composition, but the temperature has great effect. Fe73Ni9.5S17.5 film was prepared in optimized plating conditions, and XRD analysis showed that the coating structure is amorphous. The film has good soft magnetic performances with higher saturation magnetization(Ms≈876.25 kA/m) and lower coercivity(Hc≈4.96 kA/m) at room temperature. Cyclic voltammetry and the cathodic polarization curves indicated that thiourea can promote the co-deposition of Fe-Ni-S alloy.

Key words: Fe-Ni-S, electro-deposition, amorphous alloy, soft magnetic performance