Towards understanding corrosion inhibition of sulfonate/carboxylate functionalized ionic liquids: An experimental and theoretical study

Shuyun Cao; Dan Liu; Hui Ding; Hui Lu; Jianzhou Gui

doi:10.1016/j.jcis.2020.04.019

Towards understanding corrosion inhibition of sulfonate/carboxylate functionalized ionic liquids: An experimental and theoretical study

J Colloid Interface Sci. 2020 Nov 1:579:315-329. doi: 10.1016/j.jcis.2020.04.019. Epub 2020 May 28.

Authors

Shuyun Cao¹, Dan Liu², Hui Ding³, Hui Lu⁴, Jianzhou Gui⁵

Affiliations

¹ State Key Laboratory of Separation Membranes and Membrane Processes & School of Textile Science and Engineering, Tiangong University, Tianjin 300387, PR China; Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, Tianjin 300387, PR China.
² Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, Tianjin 300387, PR China; University of South Africa, College of Science, Engineering and Technology, Nanotechnology and Water Sustainability Research Unit, Florida Science Campus 1710, South Africa. Electronic address: liudan@tiangong.edu.cn.
³ School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China.
⁴ State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China.
⁵ State Key Laboratory of Separation Membranes and Membrane Processes & School of Textile Science and Engineering, Tiangong University, Tianjin 300387, PR China; Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry and Chemical Engineering, Tiangong University, Tianjin 300387, PR China. Electronic address: guijianzhou@tiangong.edu.cn.

PMID: 32610205
DOI: 10.1016/j.jcis.2020.04.019

Abstract

The inhibition performance of ionic liquids, abbreviated as [(CH₂)COOHMIm][HSO₄], [(CH₂)₂COOHMIm][HSO₄], and [(CH₂)₃SO₃HMIm][HSO₄] was investigated for carbon steel in 0.5 M HCl solution. Results indicated that these ionic liquids could act as effective inhibitors by adsorption onto the steel surface, and the inhibition efficiency increases with cation alkyl chain length and concentration up to a limit. The inhibition efficiency of a sulfonate-type ionic liquid with a longer alkyl chain is higher than those of the carboxylate-type ionic liquids. Besides, the order of inhibition efficiency was verified by both computational calculation and electrochemical experimental observations.

Keywords: Acid corrosion; Carbon steel; Inhibitor; Ionic liquid; Modeling study.