ELECTRODEPOSITION OF NI-FE ALLOYS FROM SULFATE-CITRATE-AMINO ACID BATH

The electrodeposition of nickel-iron alloys from alkaline sulphate bat h containing diammonium hydrogen citrate and amino acids has been stud ied. The deposition potential, the percentage composition of the alloy and the current efficiency of the bath solutions are determined as a function of bath composition, pH, current density, temperature, agitat ion of the bath solution and the concentration of addition agents. The electroplated alloys exhibited fee structure. Throwing power is evalu ated. Functional properties such as adhesion, hardness, porosity, magn etic properties and corrosion resistance of the alloys, electroplated under optimum plating conditions are evaluated. The anomalous codeposi tion of Fe is minimised and the quality of the plated alloys improved, only with the combination of diammonium hydrogen citrate and amino ac id.