Red onion skin extract-furfural resin as corrosion inhibitor for aluminium in acid medium

The resin formed with red onion skin extract (ROSE) and furfural has been studied as a possible inhibitor for corrosion of Aluminium in 1M H2SO4 at 30-50oC using the conventional weight loss technique. The studies reveal that at constant acid concentration, the resin acts as an effective inhibitor for aluminium corrosion in acidic medium. Inhibition efficiency increases with increase in the concentration of the resin but decreases with increase in temperature and immersion time. Based on the values of activation energy and the variation of inhibition efficiency with temperature, a physical adsorption mechanism is proposed for the adsorption of ROSE/Furfural resin on the surface of Aluminium. The adsorption of the resin was in accordance with the Langmuir adsorption isotherm at all the temperatures studied

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