Rezumat
Electrochemical synthesis of Co-W alloys from citric electrolyte with boric acid additive in cur- rent density interval 0,5 – 30 A/dm2 and electrolyte bulk temperature interval 20−56 oС has been studied. It is shown that increase of electrolyte bulk temperature allows: a) to enlarge the current density interval in which alloy deposition realizes with the maximal current efficiency (~ 70%); b) to ensure considerable decrease of deposit fissuring; c) to increase the tungsten content in alloy; d) to extend the potentialities of alloy morphology and alloy structure control. It is shown that at higher electrolyte bulk temperatures amorphous deposit develops into nanocristalline structure mainly consisting of α−cobalt. Changes of alloy composition and structure with current density increase and increase of metallic com- ponent in deposit lead to considerable decrease of current density influence on the surface temperature increment during electrodeposition.