Abstract
The inhibitive action of Cerumium rubrum extract against the corrosion of Al in a 1-M HCl environment was examined using conventional electrochemical and chemical methods. The results indicate that the extract exhibited excellent anticorrosive properties of aluminum in HCl reaching approximately 86.2% at 300 ppm at 318 K. It obeys the Langmuir adsorption isotherm. Polarization curves indicate that the extract acts as a mixed-type inhibitor. Moreover, the kinetic and thermodynamic parameters for the corrosion reaction were estimated and debated. The covering film established by the extract was checked by several techniques. All techniques gave similar results.
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