Electroplating of zinc and tin alloys with nickel and cobalt from ammonium oxalate electrolytes

Abstract

A possibility of preparing good quality electrolytic alloys zinc-nickel, zinc-cobalt, tin-nickel, and tin-cobalt from ammonium oxalate electrolytes of various compositions was shown. The alloy coatings of high quality can be obtained at the current density range from 1 to 3 A dm−2. The introduction into the electrolyte of ammonium oxalate capable of forming stable complexes with Zn2+, Sn2+, Ni2+, and Co2+ ions makes it possible to increase the working pH range. Electroplating occurs with high cathodic polarization favoring the formation of qualitative finely crystalline coatings of the plated alloys.