Influence of sodium saccharin on the electrodeposition and characterization of CoFe magnetic film

The corrosion resistance of magnetic film is a significant property which has to be considered in the magnetic head manufacture. Deposits of cobalt–iron alloy were obtained from a sulfate bath at pH 3, on copper cathodes, using direct current. In the present work, the corrosion behavior of electrodeposited CoFe film was investigated in the presence of organic additives in the electrolysis bath: sodium saccharin. Indeed, sodium saccharin salt was more soluble than saccharin. The changes in the concentration of organic additive in CoFe bath during electroforming were examined. The deposit morphology was determined by SEM observations. The main results are that the presence of sodium saccharin alters the deposit corrosion resistance properties.