介电谱
吸附
电化学
离子液体
腐蚀
盐酸
双层电容
化学
朗缪尔吸附模型
分子动力学
溴化物
无机化学
碳钢
物理化学
计算化学
有机化学
电极
催化作用
作者
F. El-Hajjaji,Mouslim Messali,Ateyatallah Aljuhani,Mohamed Reda Aouad,B. Hammouti,M.E. Belghiti,Dheeraj Singh Chauhan,M.A. Quraishi
标识
DOI:10.1016/j.molliq.2017.11.111
摘要
Two new pyridazinium-based ionic liquids namely 1-(6-ethoxy-6-oxohexyl)pyridazin-1-ium bromide (S1) and 1-(2-bromoacetyl) pyridazinium bromide (S2) were synthesized and their inhibitive performance towards the corrosion of mild steel in 1 M hydrochloric acid was studied using electrochemical impedance spectroscopy (EIS) at various temperatures (303–333 K). It was shown that the inhibition efficiency increased with the concentration of S1 and S2 and reached 84% for S1 and 82% for S2 at 10− 3 M (303 K). Impedance measurements revealed that the charge transfer resistance (Rct) increased and the double layer capacitance (Cdl) decreased with an increase in the concentration of both the inhibitors. The thermodynamic parameters provided the evidence of the inhibitory effect. Langmuir isotherm model fitted well with the adsorption of the studied compounds. Furthermore, spontaneity of the adsorption process, evaluated from the sign of free energy (ΔGadso) values, showed an increase upon increase in temperature in the presence of inhibitors. Dynamics simulation indicated the possibility of gradual substitution of water molecules from the iron surface.
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