“…Cobalt and cobalt alloys have been well known as recording media throughout the computer industry 1,2 and recently, some new application fields of cobalt and its alloys have been reported as: cobalt for interconnect 3 and self-lubrication coating 4 application, lead-cobalt alloy as effective electrocatalyst in the oxygen-evolution reaction 5 and tin-cobalt alloy as anode of lithium batteries, 6 lead-free plain bearing 7,8 as well as alternative to Sn connector contacts. 9 In the fabrication of cobalt and cobalt alloys, electrodeposition is always considered as an effective and efficient way as the coating composition and structure can be conveniently controlled by varying the operating conditions, for instance, the current density. Up to date, cobalt has been electrodeposited from chloride, 1,2,10-12 sulfate 13 and citrate [14][15][16] aqueous baths as well as from the urea-choline chloride-CoCl 2 melt 17 and deep eutectic solvent, 18 the influence of deposition parameters on current efficiency, 12 deposit morphology, 19 structure 20 and magnetic properties 19,21,22 was also investigated.…”