Laboratory of Agricultural Resources, Polymer and Process Engineering, Faculty of Sciences, IbnTofail University, PO Box 133, 14000 Kenitra, Morocco.
Laboratory of Separation Processes, Faculty of Sciences, IbnTofail University, PO Box 133, 14000 Kenitra, Morocco; Laboratory of Materials, Nanotechnology and Environment, Faculty of Sciences, Mohammed V University, Av. IbnBattouta, P.O. Box. 1014, Agdal-Rabat, Morocco.
J Colloid Interface Sci. 2020 Sep 15;576:330-344. doi: 10.1016/j.jcis.2020.05.010. Epub 2020 May 6.
Two new 7-N,N'-dialkylaminomethyl-8-Hydroxyquinolines, namely 7-N,N'-dipropylaminomethyl-8-Hydroxyquinoline (DPQ) and 7-N,N'-dimethylaminomethyl-8-Hydroxyquinoline (DMQ), were synthesized and characterized using H/C NMR and Elemental analysis methods. Corrosion inhibition effect of DMP and DPQ for C40E steel in 1 M HCl was evaluated at different concentrations (10 to 10M) and temperatures (298 to 328 K) using several experimental and computational approaches. Weight loss and electrochemical studies showed that protection efficiencies (η) of DPQ and DMQ increase with increase in concentrations. The DPQ and DMQ showed maximum efficiencies of 96.1% and 94.4%, respectivelyat 10 M. Polarization measurements showed that DMQ and DPQ act as mixed type corrosion inhibitors. Adsorption of DPQ and DMQ on C40E steel in 1 M HCl obeyed the Langmuir adsorption isotherm. Variation in surface morphology of corroded metallic surface with and without DMQ and DPQ was demonstrated using scanning electron microscopy. Molecular dynamics (MD) simulations studies showed that DPQ and DMQ acquire the flat or horizontal orientation over the C40E steel. DFT analyses revealed that both DPQ and DMQ interact with the C40E steelusing electron-sharing(donor-acceptor)mechanism. Computational analyses conducted using DFT and MD simulations well corroborate the experimental results.
两种新型的 7-N,N'-二烷基氨甲基-8-羟基喹啉，即 7-N,N'-二丙基氨甲基-8-羟基喹啉（DPQ）和 7-N,N'-二甲氨基甲基-8-羟基喹啉（DMQ），通过 1H/C NMR 和元素分析方法进行了合成和表征。采用失重法、电化学方法等研究了 DPQ 和 DMQ 对 C40E 钢在 1M HCl 中的缓蚀性能，实验研究了在 298-328K 不同浓度（10-10M）下 DPQ 和 DMQ 的缓蚀效果。电化学研究表明，随着浓度的增加，DPQ 和 DMQ 的缓蚀效率（η）增加。在 10M 时，DPQ 和 DMQ 的最大缓蚀效率分别为 96.1%和 94.4%。极化测量表明，DMQ 和 DPQ 为混合抑制型缓蚀剂。DPQ 和 DMQ 在 1M HCl 中在 C40E 钢表面的吸附符合 Langmuir 吸附等温线。通过扫描电子显微镜（SEM）观察到添加 DPQ 和 DMQ 前后金属表面的形貌变化。分子动力学（MD）模拟研究表明，DPQ 和 DMQ 在 C40E 钢表面呈水平或平面取向。密度泛函理论（DFT）分析表明，DPQ 和 DMQ 通过电子共享（供体-受体）机制与 C40E 钢相互作用。DFT 和 MD 模拟计算分析结果与实验结果吻合较好。
