Abstract
The green roasted Elaeis guineensis oil was tested as a natural inhibitor for Al-Mg-Si in simulated 3.5 % sodium chloride solution by linear potentiodynamic polarization and gravimetric method in the inhibited concentration variation between 5 % and 15 %. SEM/EDX studies were used to examine the surface morphology of the corrosion process and adsorption corrosion product that retards the degradation activities. From the experimental result, the adsorption of surface active compounds at the metal surface proved to create an organic protective film leading to efficient corrosion inhibition. The inhibitory effect significantly improved with about 98 % efficiency and the adsorption of Elaeis guineensis surfactants extract was found to follow the Langmuir adsorption isotherm.
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