ALUMINIUM CORROSION ABATEMENT USING NON TOXIC AND ECO-FRIENDLY ORGANIC INHIBITORS | Journal of ....

The corrosion inhibition performance of alkaloid and non-alkaloid leaf extracts of Cnidoscolus aconitifolius (AECAL and NAECAL) on aluminium corrosion in 1 M HCl solution at 303K and elevated temperatures of 303, 313, and 333K was investigated and compared. The weight loss method (gravimetric), hydrogen evolution (gasometric), and electrochemical techniques were used in the experiments, respectively. Both extracts appear to limit mild steel corrosion in the medium, according to the findings. At 2.0 g/L, however, AECAL had a higher maximal inhibition effectiveness (83.3%) than NAECAL (57.1%). In general, inhibitory efficiency increased as the concentration of both leave extracts increased, but reduced as the temperature rose. In the inhibition of 1M HCl, however, the 2.0 g/L concentration performed better in both samples. The temperature dependency of the inhibition efficiency, as well as the activation factors that drive the process, were used to deduce the inhibitory mechanism. The Langmuir adsorption isotherm was discovered to govern the adsorption of both extracts on the aluminium coupon. The derived thermodynamic characteristics are used to suggest the phenomenon of physical adsorption.

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