Corrosion Inhibition of Aluminum 6063 Using Some Pharmaceutical Compounds¹

A. S. Fouda^a, A. A. Al-Sarawy^b, F. Sh. Ahmed^c, and H. M. El-Abbasy^a

^a Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura-35516, EGYPT

^b Department of Chemistry, Faculty of Engineering, El-Mansoura University, El-Mansoura, EGYPT

^c Department of Chemistry, Faculty of Science (Demitta), El-Mansoura University, El-Mansoura, EGYPT

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Received April 6, 2009

Abstract — The corrosion inhibition characteristics of some pharmaceutical compounds on aluminium 6063 in 0.5 mol l^–1 H₃PO₄ has been studied using weight loss and galvanostatic polarization techniques. Results showed that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface. The inhibition efficiency increased with increasing inhibitor concentration, but decreased with increasing temperature. The adsorption of first group pharmaceutical compounds on the metal surface is found to obey Frumkin’s adsorption isotherm, but the adsorption of second group pharmaceutical compounds is found to obey Temkin’s adsorption isotherm. Thermodynamic parameters for adsorption process were determined. Galvanostatic polarization studies showed that first and second groups' pharmaceutical compounds are mixed-type inhibitors and the results obtained from the two techniques are in good agreement.