Abstract
The aluminium corrosion inhibition behaviour in the presence of Areca palm leaves (AL) extract in hydrochloric acid (0.5 M) medium was examined by chemical (mass loss), AC impedance spectroscopy, potentiodynamic polarization and surface (scanning electron microscopy) methods. Aluminium protection rates increased with an increase in the amount of AL extract to the 0.5M HCl system and decreased with increasing in the contact time of aluminium metal and temperature of 0.5M HCl solution. Arrhenius equation was applied in the determination of activation energy values. The other activation parameters such as activation entropy and enthalpy values were obtained from the transition state plot. The adsorption of AL extract species on the Al surface in 0.5M HCl solution follows the Langmuir adsorption mechanism. Tafel curves reflect the mixed (both anodic and cathodic) inhibition behaviour of green inhibitor (AL extract species) on electrode surface (Al) in 0.5M system. Impedance method indicates that the Al dissolution in hydrochloric acid environment was fully hindered by charge transfer process. The Al surface morphology was examined by applying scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. Keywords: Aluminium, Areca palm leaves, weight loss, Arrhenius equation, Langmuir adsorption
Highlights
Hydrochloric acid solutions are widely utilized in oil well acidification, removal of scale and rust in metallurgy, acid pickling, de-scaling and cleaning of boilers in industrial processes
Scanning electron microscopy (SEM) and atomic force microscopy (AFM) tool was employed for the Al surface study in uninhibited and inhibited conditions
Atomic Force Microscopy (AFM) Technique It is observed that the reduction in the value of average roughness (Sa) and root mean square roughness (Sq) in inhibited system (0.5 M HCl + plant extract species) compared to bare system is an indication of lesser aluminium corrosion rate in inhibited state
Summary
Hydrochloric acid solutions are widely utilized in oil well acidification, removal of scale and rust in metallurgy, acid pickling, de-scaling and cleaning of boilers in industrial processes. Many researchers reported the green corrosion inhibition property of natural extracts on Al metal in hydrochloric acid environment.[13,14,15,16,17,18]. Areca leaves extract mainly contains electron rich species molecules such as lignin, cellulose, ursolic acid, 3b acetyl ursolic acid and hemicelluloses.[19,20] There is no report on potential corrosion inhibition property of Areca leaf extract for any central metal in any corrosive systems. In the present case, we selected Areca leaf extract for the protection of Al surface from hydrochloric acid solution The experimental methods such as gravimetric (mass loss), potentiodynamic polarization (Tafel curves) and impedance techniques are used to explain the Al corrosion inhibition mechanism. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) tool was employed for the Al surface study in uninhibited (without Areca leaf extract) and inhibited (with Areca leaves extract) conditions
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