Influence of Composite Nano Coating on Ternary Sulphate Co-deposition: Corrosion and Surface Characterization

In this study, composite Zn-ZnO-MgO have been produced from a sulphate bath in the presence of dispersible MgO nano composite on mild steel substrate in the absence of surfactant. The resulting fabricated coating shown that the amount of MgO embedded in the coating is dependent not only on the time of deposition but also the incorporated particulate and the applied current density. The influence of the particulate from 8-16 wt% on the ternary series was extensively investigated on the coating efficiencies and coating texture. The structural changes of the co-deposited alloys were investigated by scanning electron microscope coupled with energy dispersive spectroscopy (SEM-EDS). The corrosion characteristics properties in 3.65% NaCl medium were studied using linear potentiodynamic polarization route and characterized by high resolution optical microscope. Results show the deposition of MgO particulate contribute immensely to the corrosion propagation resistance of the Zn-ZnO-MgO coating. It was also established that the addition of the dispersible composite significantly influence the coating texture and efficiency.