期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2014
卷号：5
期号：1
页码：255-262
出版社：University of Mohammed Premier Oujda
摘要：The inhibitive effect of four q uinoxaline derivatives named 1-ethyl-3-methylquinoxalin-2(1H)-one (Et-N-Q=O), 1-benzyl-3-methylquinoxalin-2(1H)-one (Bz-N-Q=O), 3-methyl-1-prop-2-ynylq uinoxalin-2(1H)-one (Pr-N-Q=O) and 3-methyl-1-prop-2-ynylquinoxaline-2(1H)-thione (Pr-N-Q=S), on the corrosion of mild steel in hydrochloric acid 1 M has been investigated at 308 K. The study was carried out using weight loss measurements, potentiod ynamic polarisation and electrochemical impedance spectroscopy (EIS) methods. The obtained results showed that Pr-N-Q=S and Pr-N-Q=O were the best inhibitors and their inhibition efficiencies increased with the increase of inhibitor concentration and reached up to 92 % for Pr-N-Q=O and 93 % for Pr-N-Q=S at 10.3M. Potentiodynamic polarisation studies clearly revealed that the presence of these inhibitors did not change the mechanism of hydrogen evolution and that they acted as mixed-type inhibitors with predo minance at cathodic range. EIS measurements sho wed that the charge transfer resistance increases whereas the double layer capacitance decreases with the inhibitor concentration. The effect of temperature is studied and determination o f the activation and adsorption parameters is discussed separately in part 2 and part 3 for Pr-N-Q=O and Pr-N-Q=S, respectively. In part 4, quantum chemical calculations were undertaken to correlate the structure electronic properties with corrosion inhibition efficiency for all studied quinoxaline molecules
