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Comparative inhibition study of mild steel corrosion in hydrochloric acid by new class synthesised quinoxaline derivatives: part I |
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| Authors: | K Adardour R Touir Y Ramli R A Belakhmima M Ebn Touhami C Kalonji Mubengayi H El Kafsaoui E M Essassi |
| Institution: | 1. Materials, Electrochemical and Environment Laboratory, Faculty of Science, University Ibn Tofail, BP 133, Kenitra, Morocco 2. Laboratoire Nationale de Contr?le des Médicaments, Direction du Médicament et de la Pharmacie, BP 6206, 10000, Rabat, Morocco 3. Laboratory of Heterocyclic Organic Chemistry, Faculty of Science, Mohammed V University, Rabat, Morocco 4. Institute of Nanomaterials and Nanotechnology, MAScIR, Rabat, Morocco |
| Abstract: | 7-Cchloro-3-(4-methoxystyryl)quinoxalin-2(1H)-one (CMOSQ) and 7-chloro-2-(4-methoxyphenyl)thieno(3.2-b)quinoxaline (CMOPTQ) have been investigated for mild steel corrosion in 1 M HCl at different concentrations using weight loss measurements, potentiodynamic polarization curves and electrochemical impedance spectroscopy methods. Generally, inhibition efficiency of the investigated compounds was found to depend on inhibitor concentration and their structures. Comparitive results showed that CMOPTQ was the best inhibitor and the inhibition efficiency increased with increasing the concentration and attained 86 and 87 % at 10?3 M of CMOPTQ and 10?3 M of CMOSQ, respectively. Potentiodynamic polarization studies clearly reveal that these inhibitors act essentially as cathodic-type inhibitors. The inhibition efficiency increases with immersion time and reaches 95 % CMOPTQ at 24 h. The electrochemical impedance spectroscopy result showed that these compounds act by formation of film. |
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