Studies on the influence of metal oxides on the galvanic characteristics of hot-dip zinc coating

In the present work, hot dip zinc coating incorporated with various composite was developed. The effect of ZnO and V2O5 in the galvanizing characteristics of zinc coating was studied with a view to apply the coating for functional application. The pretreatment conditions and bath compositions were fixed based on the available literatures and on the preliminary test results. Different electrochemical techniques were followed to study the corrosion tolerance of the coating. The presence of ZnO had a beneficial influence on the protection span of the coating compared to that of V2O5. The presence of composite reinforced inner layer influenced the alloying reaction between Fe and Zn. The surface topography of the coating was also improved due to the metal oxide incorporation.