Electrodeposition of Sn and Co coatings from citrate solutions

Optimal conditions for Sn and Co codeposition were achieved in slightly aci d citrate solutions containing no excess of ligand. Sn-Co coatings were dep osited with amounts of Co ranging from 15 to 86 mass %. Bright deposits wer e obtained when the Co content exceeded 76%. These coatings may be consider ed as solid solutions of tin in alpha -Co and beta -Co. The beta -Sn phase is predominant in the case of coatings containing less Co. Voltammograms of the partial processes of Sn(II) and Co(II) reduction may be described quan titatively with the proviso that SnL2- and CoLH- are electrically active co mplexes.