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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   INFLUENCE OF PB2+ IONS ON ZINC ELECTROWINNING FROM SULFATE SOLUTIONS.

Authors:  LIANA MUREŞAN, OLIMPIA ONAC. 		 
       
         
  Abstract:  The effect of trace lead on zinc electrodeposition from sulfate electrolyte has been investigated in terms of cathodic deposit morphology and cyclic voltammetry. The results indicated that Pb2+ ion has a deleterious effect on zinc electrodeposition from sulfate electrolyte. In presence of increasing Pb2+ concentrations, the morphology of zinc deposits was observed to change from smooth to dendritic, less adherent and the color changed from silver to a dark gray, proving a grain refining related to an inhibition effect. Pb2+ also affects the zinc deposition cyclic voltammograms. It increases the nucleation overpotential and diminishes the area of cathodic and anodic peaks, proving the inhibition of both the cathodic and anodic reactions. The addition of horse chestnut extract (HCE) to the Pb2+ containing electrolyte counteracts the detrimental effect of these ions, leading to cathodic deposits with acceptable morphology, while increasing concentrations of animal glue, at the same Pb2+ concentration (3.18 10-4 g/l) do not improve the cathodic morphology.  
         
     
         
         
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