Benzothiazole Derivatives as Corrosion Inhibitors for Carbon Steel in 1 M H3PO4 Solutions

Fouda, A.S.; Diab, M.; El-Sonbaty, A.; Hassan, Sh A.

doi:10.21608/sjdfs.2012.193997

Benzothiazole Derivatives as Corrosion Inhibitors for Carbon Steel in 1 M H3PO4 Solutions

Document Type : Original articles

Authors

¹ Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura, 35516, Egypt

² Department of Chemistry, Faculty of Science, Damietta University, New Damietta, 34517, Egypt

10.21608/sjdfs.2012.193997

Abstract

The inhibition of the corrosion of carbon steel in 1 M H3PO4 solutions by some benzothiazole derivatives has been investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Inhibition was found to increase with increasing concentration of the benzothiazole derivatives but decreased with rise in temperature. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the metal surface. The adsorption of these compounds on carbon steel surface obeys the Temkin's adsorption isotherm. Potentiodynamic polarization measurements showed that benzothiazole derivatives act as mixed-type inhibitors.

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