Corrosion prevention of AA2024-T3 aluminum alloy in acidic media using Cydonia Vulgaris leaves extract

Aluminum is widely used as a material in automobiles, aviation, household appliances, containers, and electronic devices The resistance of aluminum against corrosion in aqueous media can be attributed to the rapid formation of oxide films on the surface. However, aluminum gets easily corroded in the presence of corrosive acids. Studies of the corrosion behavior of aluminum in different aggressive environments have continued to attract attention because of its important applications. The study of Cydonia Vulgaris leaves extract (CVL) as a corrosion inhibitor for AA2024-T3 aluminum alloy in 1 M H3PO4 acid solution using weight loss method was investigated at 25, 35, 45 and 55 degrees C. The results revealed that CVL leaves in 1 M acidic environment decreased the corrosion at various concentrations considered. Higher inhibition efficiency for AA2024-T3 aluminum alloy of up to (94.58%) was produced at a higher levels of inhibitor concentrations and temperatures. The adsorption of CVL extracts was found to obey the Langmuir adsorption isotherm model. The values of the free energy of adsorption were more than -20 kJ/mol which is indicative of a mixed mode of physical and chemical adsorption. Activation enthalpy (Delta H*) and activation entropy (Delta S*) of AA2024-T3 aluminum alloy corrosion was found to be (48.7570 kJ center dot mol(-1)), (-0.1782 kJ center dot K-1) and (31.9920 kJ center dot mol(-1)), (-0.1873 kJ center dot K-1) in the absence and presence of the extract, respectively.