Abstract
Thin films of Fe-Ni alloys have been electroplated from acidic sulphate bath (0.06 mol dm−3 NiSO4, O.O15 mol dm−3 FeSO4, 0.005 mol dm−3 ascorbic acid, 20 g dm−3 boric acid and 1 g dm−3 saccharin) containing aliphatic amines. The percentage Ni in the alloy varied with bath composition (Fe/Ni), current density, stirring of the medium, nature and concentration of the amine. Increase of temperature and pH of the medium increased the percentage Ni in the deposit. The composition of the alloy remained constant with thickness of the film. The cathodic current efficiency depends on the plating variables. The plating potential in acidic sulphate bath was shifted in the less noble direction by the presence of amines. Smooth and bright films are obtained with small grain size when the Ni in the film is 75% or above. Electroplating conditions are optimized to get thin, magnetic 20∶80 Fe-Ni films.
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