Electrodeposition of Ni-Al2O3 nano composite coating and evaluation of wear characteristics

Abstract

Electrodeposition is one of the most technologically feasible and economically superior technique for producing metallic coating. The advancement in the application of nano particles has grabbed the attention in all fields of engineering. In this present study an attempt has been made on the nano particle composite coating on aluminium substrate by electrodeposition process. The aluminium surface requires a specific pre-treatment for better adherence of coating. In light of this a thin zinc layer is coated on the aluminium substrate by electroless process. This layer offers protection against oxidation thus prevents the formation of a native oxide layer. In this work Ni-Al2O3 composite coating were successfully coated by varying the process parameters such as bath temperature, current density and particle loading. The experimentation was performed using central composite design based 20 trials of experiments. The effect of process parameters on surface morphology and wear behavior was studied. The results shown a better wear resistance of Ni-Al2O3 composite electrodeposited coating compared to Ni coating. The particle loading and interaction effect of current density with temperature has greater significant effect on wear rate followed by the bath temperature. The decrease in wear rate was observed with the increased current density and temperature.