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Effect of Mn2+ ions on the electrodeposition of zinc from acidic sulphate solutions
- Source :
-
Hydrometallurgy . Nov2009, Vol. 99 Issue 3/4, p249-254. 6p. - Publication Year :
- 2009
-
Abstract
- Abstract: The effect of Mn2+ ions on current efficiency (CE), deposit morphology and polarization behaviour during electrodeposition of zinc from acidic sulphate solutions was investigated. In the conditions studied, Mn2+ ions had no significant effect on CE over the concentration range of 1–10gdm−3. However, a decrease in CE of more than 35% was obtained at 50gdm−3. The cathodic polarization curves and the corresponding kinetics analysis demonstrated that this decrease in CE at higher concentrations of Mn2+ ions was due to the strong depolarizing effect of MnO4 − ions and other oxidized products of manganese. Moreover, the kinetics analysis of anodic polarization suggested that the presence of Mn2+ ions catalyzed the oxygen evolution reaction. The addition of Mn2+ ions was also observed to change the surface morphology and deposit quality of the electrodeposited zinc, affecting the crystallographic orientation by significantly inhibiting the growth of (002) and (100) planes. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 0304386X
- Volume :
- 99
- Issue :
- 3/4
- Database :
- Academic Search Index
- Journal :
- Hydrometallurgy
- Publication Type :
- Academic Journal
- Accession number :
- 44584389
- Full Text :
- https://doi.org/10.1016/j.hydromet.2009.09.002