Cobalt-Boron alloy has been deposited on steel from an alkaline citrate bath. Uniform deposits have been obtained in the current density range of 8-15 Adm-2. Cyclic voltammeter studies on platinum from this bath reveal that the cobalt citrate complexes undergo stepwise electro nation with the participation of hydroxyl ions. The borates undergo reduction to boron in the alloy deposition. The hydrogen evolution reaction has been found to be hindered by cobalt and borate ions. Stripping Volta metric curves on the alloy film suggest the dissolution of cobalt from a cobalt rich phase.
