Abstract: The effects of molybdenum content in the bath, current density and temperature on the structure and surface characteristics of amorphous Fe Mo alloys electrodeposited from the bath containing FeSO₄, Na₂MoO₄, H₃Cit and NaCl (pH=3～5) were investigated by using XRD, SEM and XPS. The results show that amorphous Fe-Mo alloys can be obtained as long as the molar fraction of Mo in Mo/Mo+ Fe in the bath is larger than 50%,the applied current density larger than 25mA/cm²and the temperature of electrolyte lower than 40 ℃. The SEM observation of the microstructure of the electrodeposited Fe-Mo alloys shows that the deposits contain numerous granules and cracks. According to the results of XPS, both Fe and Mo exist in metallic state in the bulk alloys but in oxidized states on the surface of the alloys. The results indicate that Fe and Mo on the surface of the alloys are easy to react with H₂O or O₂in air resulting in the formation of oxide films. The corrosion resistance of the amorphous alloys in 3% NaCl solution surpasses that of pure iron.

Key words: Electrodeposition, Fe-Mo alloy, Amorphous state, Structure, Surface characteristics