Influence Mechanism of Sulfide Ions during Manganese Electrodeposition

Abstract

Influence mechanism of sulfide ions (S^2-) during manganese electrodeposition from sulphate electrolyte was investigated. Under the experimental conditions, S^2- ion concentration and electrolyte pH represented significant multiple effects on the cathode current efficiency. Scanning electron microscope (SEM) indicated that electrodeposition manganese layer (EML) became refinement as S^2- ion concentration was increased. X-ray Diffraction (XRD) displayed that S^2- ion had negligible influence on the preferred orientation of the crystalline layer of the EML. S^2- ion had no influence on the chemical composition of EML. S^2- ion could improve the corrosion resistance of EML. The interaction mechanism of S^2- ion with manganese electrodeposition was systematically explored by analysing E-pH diagram, cyclic voltammetry curve, cathode polarization curve and electrochemical impedance method.

Keywords

S^2- ion / Manganese electrodeposition / E-pH diagram / electrochemical behavior

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