Investigation of anionic group effects on the shale inhibition performance of fatty acid-based ionic liquids and their inhibition mechanism

Experimental and Theoretical Studies of the Corrosion Inhibition Performance of Fatty Acid-based Ionic Liquids for Mild Steel in 1 M HCl: Effects of the Varied Alkyl Chain Length in the Anionic Group

“…It is demonstrated that both cationic and anionic groups of FAILs play significant roles for the inhibitor capability. In our previous study, we found that the FAILs can adsorb on the negative charged clay surface and the octanoic anion can reduce the electrostatic repulsion among the cations and improve the hydrophobic interaction to enhance the adsorbed film intensity. Longer alkyl chain lengths can cause obvious steric hindrance to reduce the film intensity.…”

“…It is noteworthy that with the growth of the anionic alkyl chains, the IE value of the five FAILs increases first and then decreases (80.73% for [N 8881 ]­[C 4:0 ], 89.34% for [N 8881 ]­[C 6:0 ], 96.94% for [N 8881 ]­[C 8:0 ], 90.09% for [N 8881 ]­[C 12:0 ], and 74.42% for [N 8881 ]­[C 16:0 ]), and [N 8881 ]­[C 8:0 ], which possesses the same cationic and anionic alkyl chain lengths, exhibits the optimal inhibition performance. Our previous reports found that the molecular structures of FAILs exerted crucial effects on their adsorbed film tightness through intramolecular and intermolecular interactions, which might be responsible for the different corrosion IEs of FAILs.…”

“…Figure 6 which possesses the same cationic and anionic alkyl chain lengths, exhibits the optimal inhibition performance. Our previous reports found that the molecular structures of FAILs exerted crucial effects on their adsorbed film tightness through intramolecular and intermolecular interactions, 32 which might be responsible for the different corrosion IEs of FAILs.…”

“…Herein, our research aims to investigate the effects of the large-size anion groups in ILs and the lateral intermolecular interaction of the adsorbed film on the inhibition performance. In our previous research, we found that the intramolecular interaction between cationic/anionic groups could affect their adsorption behavior on the oil/water interface and clay interlayer. , In the present system, we employ fatty acid-based ionic liquids (FAILs) to study the effects of the length of the anionic alkyl chains on the corrosion inhibition performance in 1 M HCl solution. The different inhibition ability of FAILs was investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and weight loss measurements.…”

Mini-review on Recent Advances in the Application of Surface-Active Ionic Liquids: Petroleum Industry Perspective

“…Because of their distinctive physical and chemical properties, such as high thermal stability, negligible vapor pressure, biodegradability, nonvolatility, noncorrosiveness, and inflammability, ILs have received a lot of attention . As a result, ILs are used in biocatalytic transformations, chemical synthesis, electrochemistry, separation and analytical science, catalysis, biomass conversion, desulfurization, scale removal, gas hydrate, carbon capture, crude oil dissolution, and oil/water IFT reduction. ,− …”