VOLTAGE EFFECT ON ELECTROCHEMICAL ANODIZATION OF ALUMINUM AT AMBIENT TEMPERATURE

The effect of voltage on nano pores formed via electrochemical anodization of high purity Aluminum was investigated. The electrochemical bath consists of phosphoric acid electrolyte; a platinum electrode was used as the cathode electrode, and aluminum template as anode electrode. The anodization process was carried out at ambient temperature with voltage range of 20V to 80V, which is the voltage range achievable by the in house electrochemical cell. It is observed after the anodization process that there is slight phase change in the aluminum substrate of its FCC structure to Monoclinic at 39˚ and 45˚ with the same effect for all the applied potentials; secondly it was also observed that at every voltage increment there is a significant increase in current density, as well as increase in the nano pore size from about 40nm to 300nm. The morphology and phase composition were characterized by scanning electron microscope (SEM), energy dispersive spectroscopy (EDX), X-ray diffraction and Voltage time graph