Abstract Inhibition of CO 2 corrosion of mild steel in 0.5 M NaCl under atmospheric pressure at 40 °C as well as high pressure (10 bar) at 120 °C by 2-[2-methyl-4(or 5)-alkylisoxazolidin-5(or 4)-yl)methyl]succinic acids, a new class of molecules having inhibitive motifs of succinic acid, isoxazolidine and hydrophobic alkyl chain assembled in a single entity, has been examined by gravimetric and electrochemical methods. Inhibitor molecule containing CH 3 (CH 2 ) 8 outperformed its counterpart with a shorter hydrophobe CH 3 (CH 2 ) 4 and two other commercial imidazoline-based inhibitors. The effectiveness of these new inhibitors was also evaluated by electrochemical impedance spectroscopy. The inhibition efficiency by EIS was found to be 75%, 91% and 98% in the presence of 1, 5 and 20 ppm, respectively, at 40 °C. The potentiodynamic polarization studies indicated that the new inhibitors act as anodic inhibitors. The adsorption of the synthesized inhibitors follows Temkin adsorption isotherm model with favorable high values of –Δ G ° ads and −Δ H ° ads pointing the inhibitors adsorbed on the metal surface by chemisorption process. The XPS study confirmed the adsorption of the inhibitors on the metal surface.

中文翻译：

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在单一实体中组装琥珀酸和异恶唑烷基序以减轻盐水介质中低碳钢的 CO 2 腐蚀

摘要 2-[2-甲基-4(或5)-烷基异恶唑烷-5对低碳钢在0.5 M NaCl中40 °C常压和120 °C高压(10 bar)CO 2 腐蚀的抑制作用(或4)-基)甲基]琥珀酸是一类新的分子，具有琥珀酸、异恶唑烷和疏水性烷基链的抑制基序组装在一个实体中，已通过重量分析和电化学方法进行了研究。含有 CH 3 (CH 2 ) 8 的抑制剂分子的性能优于其具有较短疏水基 CH 3 (CH 2 ) 4 和其他两种商业咪唑啉基抑制剂的对应物。还通过电化学阻抗谱评估了这些新抑制剂的有效性。在 1、5 和 20 ppm 的浓度下，在 40 °C 下，EIS 的抑制效率分别为 75%、91% 和 98%。动电位极化研究表明新的抑制剂作为阳极抑制剂。合成抑制剂的吸附遵循 Temkin 吸附等温线模型，具有有利的高值 –ΔG°ads 和 -ΔH°ads，表明抑制剂通过化学吸附过程吸附在金属表面。XPS 研究证实了抑制剂在金属表面的吸附。