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Ehsani, Ali,Moshrefi, Reza,Ahmadi, Maliheh The Korean Electrochemical Society 2015 Journal of electrochemical science and technology Vol.6 No.1
3-(4-Iodophenyl)-2-imino-2,3-dihydrobenzo[d]oxazol-5-yl 4-methylbenzenesulfonate (4-IPhOXTs) was synthesized and its inhibiting action on the corrosion of stainless steel 316L (SS) in sulfuric acid was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of the investigation show that this compound has excellent inhibiting properties for SS corrosion in sulfuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of 4-IPhOXTs onto the SS surface followed the Langmuir adsorption model with the free energy of adsorption ΔG<sup>0</sup><sub>ads</sub> of −8.45 kJ mol<sup>−1</sup> . Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of 4-IPhOXTs.
Ali Ehsani,Mahmoud Nasrollahzadeh,Mohammad Ghasem Mahjani,Reza Moshrefi,Hossein Mostaanzadeh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The 3,30-(1,4-phenylene)bis(2-imino-2,3-dihydrobenzo[d]oxazole-5,3-iyl)bis(4-thylbenzenesulfonate)(1,4-Ph(OX)2(Ts)2) was synthesized and its inhibiting action on the corrosion of 1005 aluminum alloy(Al) in sulphuric acid was investigated by means of potentiodynamic polarization and electrochemicalimpedance spectroscopy (EIS). In the potentiodynamic polarization measurements the values of bc hadsmall changes with increasing inhibitor concentration, which indicated that the 1,4-Ph(OX)2(Ts)2 wasadsorbed on the metal surface and the addition of the inhibitor hindered the acid attack on the Alelectrode. In anodic domain, the value of ba decreases with the presence of 1,4-Ph(OX)2(Ts)2. The shift inthe anodic Tafel slope ba might be attributed to the modification of anodic dissolution process due to theinhibitor modules adsorption on the active sites. The inhibition efficiencies were obtained from weightloss measurement and electrochemical tests. The adsorption of 1,4-Ph(OX)2(Ts)2 onto the Al surfacefollowed the Langmuir adsorption model with the free energy of adsorption -△G0ads of -5.13 kJ mol1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibitionaction of 1,4-Ph(OX)2(Ts)2.