Abstract
The inhibitive efficiencies of pyridine and some of its derivatives have been studied in relation to the corrosion of Al (grade 1100) in 1%HCl at 25, 35, 45, and 55°C. The efficiencies increase in the order: pyridine, aniline, 2-picoline, 3-picoline, 4-picoline, 2: 4-lutidine. The percentage inhibition efficiencies increase with the concentration of the inhibitors and decrease with increasing temperature, while the activation energy of corrosion is increased by increasing both the concentration and the temperature. The Langmuir adsorption iso therm equation is obeyed with some deviations by all inhibitors. All of the inhibitors are found to act predominantly on cathodic sites and are only partially effective on anodic sites.
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