Abstract
Different techniques were used to illustrate the effect of manganese concentration on the composition and microstructure of Zn-Ni-Mn films. Zn-Ni-Mn alloys electrodeposited from aqueous sulfate media, under acidic conditions was investigated. According to the obtained results the Zn-Ni-Mn showed greater corrosion resistance than Zn-Ni alloy under similar conditions. Galvanostatic measurements for electrodeposition, cyclic voltammetry (CV) were used to the anodic and cathodic behavior of alloy to study the potential ranges. Anodic linear sweep voltammetry (ALSV) technique was used for the phase structure determination. It is obvious that increasing the manganese concentration results in decreasing the grain size and the coating is uniform and homogenous. The corrosion test was performed by the potentiodynamic anodic polarization method. The corrosion resistance of the coating films was increased with increasing Mn ions in the electrolyte. Under these experimental conditions the electrodeposition of the alloys is of anomalous type.