4-Aminobenzenesulfonic Acid as Effective Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid | ||||
| Egyptian Journal of Chemistry | ||||
| Article 24, Volume 64, Issue 2, February 2021, Page 825-834 PDF (584.41 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2020.44335.2897 | ||||
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| Authors | ||||
Amal M. Abdel-karim   1; Seham Shahen 2; Ghalia Gaber 2
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| 1Physical Chemistry department, NRC, Dokki, Giza, Egypt. | ||||
| 2Department of Chemistry, Faculty of Science (Girls), Al-Azhar University, P.O. Box: 11754, Yousef Abbas Str., Nasr City, Cairo, Egypt | ||||
| Abstract | ||||
| The inhibitive activity of 4-aminobenzenesulfonic acid (SA) on the corrosion of carbon steel in 1 M HCl medium has been studied by weight loss, potentiodynamic, and impedance spectroscopy measurements. Experimental results reveal that sulphanilic acid goes about as an inhibitor in the corrosive condition. The inhibition efficiency increases with an increase in the SA concentration. The greatest inhibition efficiency is 92.14% at SA concentration 1000 ppm. Thermodynamic and kinetic parameters have been got from temperature studies. Electrochemical estimation reveals that sulphanilic acid acts as a mixed inhibitor and the adsorption isotherm follows Langmuir. The surface examination by SEM and surface composition was evaluated using EDX that shows the presence of a protective layer of SA molecules on the surface. | ||||
| Keywords | ||||
| Corrosion; Sulphanilic acid; Carbon steel; Electrochemical measurements; and Adsorption isotherm | ||||
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