Amorphous cobalt-boron alloy electrodeposition and dissolution

Co-B alloy has been deposited on steel from an alkaline citrate bath. Unifo rm deposits have been obtained in the current density range of 8-15 Adm(-2) . Cyclic voltammetric studies on platinum from this bath reveal that the co balt citrate complexes undergo stepwise electronation with the participatio n of hydroxyl ions. The borates undergo reduction to boron in the alloy dep osition. The hydrogen evolution reaction has been found to be hindered by c obalt and berate ions. Shipping voltammetric curves on the alloy film sugge st the dissolution of cobalt from a cobalt rich phase.