Current pulse with reverse plating of nickel-iron alloys in a sulphate bath

Ni-Fe alloys were galvanostatically pulse plated on copper rotating disk electrodes in sulphate solutions. Using a reverse current during the pulse relaxation period causes the dissolution of both iron and nickel. Anodic passivation of pure nickel was not observed in the binary Ni-Fe alloys since nickel dissolves during the period of reverse current. Boric acid increases the selectivity of iron in the current-controlled process. Higher solution pH enhances both nickel and iron reductions. Higher pulse frequency induces a decrease of average nickel deposition rate, and as a result, iron composition in the alloy is increased. Raising temperature causes the increase of iron contents in the alloys.