文献类型：期刊文献

英文题名：Dimeric imidazolium ionic liquids connected by bipyridiyl as a corrosion inhibitor for N80 carbon steel in HCl

作者：Zhang, Juantao[1,2];Kong, Minjian[3,4];Feng, Jiangtao[1];Yin, Chengxian[2];Li, Danping[2];Fan, Lei[2];Chen, Qibin[3,4];Liu, Honglai[3,4]

机构：[1]Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China;[2]CNPC Tubular Goods Res Inst, State Key Lab Performance & Struct Safety Petr Tu, Xian 710077, Shaanxi, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：344

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：;EI(收录号：20214511116506);WOS:【SCI-EXPANDED(收录号:WOS:000720349200015)】；

基金：This work is supported by National Natural Science Foundation of China (No. 91834301) and the 111 Project of Ministry of Education of China (No. B08021).

语种：英文

外文关键词：Ionic liquid; Inhibitor; Dimeric amphiphile; Anticorrosion

摘要：A new type of the dimeric imidazolium-type amphiphile, BDBCmIB (m = 1, 4 and 8), was synthesized using the bipyridiyl as the spacer, and its inhibition performance and mechanism for the corrosion of N80 carbon steel in 1.0 mol.L-1 HCl were evaluated using chemical and electrochemical measurements, surface analyses and density functional theory (DFT) calculations. Results show that the inhibition efficiency of BDBC(m)IBs increases with their concentrations and the length of tail chains. BDBC8IB exhibits the best inhibition performance among them and its inhibition efficiency almost exceeds 90% in a wide concentration range from 1.0 x 10(-6) to 5.0 x 10(-4) mol.L-1 mol.L-1 at 25.0 degrees C, which attains the maximum over 95% at 5.0 x 10(-4) mol.L-1. Moreover, three BDBC(m)IBs all display the high inhibition efficiency at 5.0 x 10(-4) mol.L-1, nearly exceeding 90%, in the temperature range from 25.0 to 55.0 degrees C. As a mixedtype inhibitor, BDBC(m)IBs can retard both cathodic hydrogen evolution and anodic metal dissolution processes, since BDBCmIB molecules bear the imidazolium-based heterocycle with the electron-donating ability and the bipyridine with the electron-accepting ability, thereby facilitating the formation of a protective film on the surface of N80 carbon steel via electrostatic interactions, coordinated and backdonating bonds. The adsorption of BDBC(m)IBs obeys the Langmuir isothermal model. Our finding demonstrates that the introduction of the bipyridiyl at the spacer does favor improving the inhibition efficiency of such dimeric imidazolium-type amphiphiles, and meanwhile, the proper increase in the number of carbon atoms in the substituents on the imidazole rings can also enhance the inhibition efficiency. (C) 2021 Elsevier B.V. All rights reserved.