COBALT-INDIUM ALLOYS ELECTRODEPOSITION FROM CITRATE ELECTROLYTE AND SPATIO-TEMPORAL PATTERNS FORMATION
Cyclic voltammetry technique was used to compare the mechanism of the deposition of In, Co and Co-In from citrate electrolytes. Samples of Co-In coatings were electrodeposited at different current densities to permit the subsequent investigation of their physicochemical characteristics. It was established a strong relation between CoIn phase composition and the electrolysis conditions. At low current densities below the limiting current only In was deposited. At higher current the alloy phase of CoIn3 was formed, besides that of In, and minority phases were Co and Co(OH)2. At higher current densities of about 0.8-1.5 A/dm2, when intensive hydrogen evolution was observed, specific patterns (spirals, waves, targets) were visible onto the Co-In coating surfaces, considered as spatio-temporal structures. The pattern formation could be promoted by the specific hydrodynamic conditions close to the cathode-electrolyte interface and by the concentration fluctuation of the ionic species
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