An Environmentally Friendly Approach Towards Mitigation of Al Corrosion in Hydrochloric Acid by Yellow Colour Ripe Arecanut Husk Extract: Introducing Potential and Sustainable Inhibitor for Material Protection

Abstract

The effect of extracts of yellow colour ripe arecanut husk on the inhibition of Al corrosion in 0.5 M HCl solution was examined through weight loss and electrochemical techniques. Weight loss results show that yellow colour ripe arecanut husk extract acts as a good adsorption green corrosion inhibitor for Al metal in 0.5 M HCl solution. The protection efficiency of the inhibitor varied with the inhibitor concentration. The protective action of the yellow colour ripe arecanut husk extract increased with the increase in its amounts in 0.5 M HCl solution. The Langmuir isotherm model shows that yellow colour ripe arecanut husk extract inhibits the Al corrosion in 0.5 M HCl solution by adsorption mechanism. Tafel curves proved that yellow colour ripe arecanut husk extract is mixed-type inhibitor. Results of Nyquist curves confirmed that adsorption of yellow colour ripe arecanut husk extract species led to a enhance in charge transfer resistance values and decrease in the values of double-layer capacitance. Both scanning electron microscopy and atomic force microscopy techniques are used to examine the Al surface morphology without and with the yellow colour ripe arecanut husk extract. Protection efficiency obtained by chemical and electrochemical techniques at different inhibitor concentrations.