Benevolent Behavior of Arecanut Husk Extracts as Potential Corrosion Inhibitor for Aluminum in both 0.5 M HCl and 0.1 M NaOH Environments

Abstract

The purpose of present study is to incite the effectiveness of green color arecanut husk extract as an inhibiting agent for aluminum metal in both 0.5 M HCl and 0.1 M NaOH systems. The protection efficiency of green inhibitor was assessed through gravimetric, and Tafel plot (potentiodynamic polarization) techniques. The weight loss experiment was performed in unstirred and stirred test solutions in order to study the stability of the inhibitory protective film on the surface of the aluminum. The influence of temperature and time on adsorption of arecanut husk extracts constituents on the surface of aluminum has been studied. Both Tafel and Nyquist curves measurement after the stabilization period of the aluminum metal in 0.5 M HCl/0.1 M NaOH solution confirmed that the introduction of arecanut husk extract appreciably decreased the rate of aluminum corrosion. The powder X-ray diffraction tool was used to study the nature of green inhibitor and its protective film created on aluminum metal in 0.5 M HCl and 0.1 M NaOH medium. The scanning electron microscopy and atomic force microscopy images confirm that the inhibited aluminum surface is superior compared to uninhibited aluminum surface.