Inhibition Mechanism of Some Vinylalkylimidazolium-Based Polymeric Ionic Liquids against Acid Corrosion of API 5L X60 Steel: Electrochemical and Surface Studies

Giselle Gómez-Sánchez; Octavio Olivares-Xometl; Natalya V Likhanova; Paulina Arellanes-Lozada; Irina V Lijanova; Víctor Díaz-Jiménez; Diego Guzmán-Lucero; Janette Arriola-Morales

doi:10.1021/acsomega.2c04787

Inhibition Mechanism of Some Vinylalkylimidazolium-Based Polymeric Ionic Liquids against Acid Corrosion of API 5L X60 Steel: Electrochemical and Surface Studies

ACS Omega. 2022 Oct 14;7(42):37807-37824. doi: 10.1021/acsomega.2c04787. eCollection 2022 Oct 25.

Authors

Giselle Gómez-Sánchez¹, Octavio Olivares-Xometl¹, Natalya V Likhanova², Paulina Arellanes-Lozada¹, Irina V Lijanova³, Víctor Díaz-Jiménez¹, Diego Guzmán-Lucero², Janette Arriola-Morales¹

Affiliations

¹ Benemérita Universidad Autónoma de Puebla, Facultad de Ingeniería Química, Av. San Claudio y 18 Sur, Ciudad Universitaria, Col. Jardines de San Manuel, C. P. 72570, Puebla, Puebla, México.
² Instituto Mexicano del Petróleo, Gerencia de Materiales y Desarrollo de Productos Químicos, Eje Central Lázaro Cárdenas No. 152, Col. San Bartolo Atepehuacan, C. P. 07730, Ciudad de México, CDMX, México.
³ Instituto Politécnico Nacional, CIITEC, Cerrada Cecati S/N, Colonia Santa Catarina, Azcapotzalco, C. P. 02250, Ciudad de México, CDMX, México.

Abstract

A corrosion inhibition mechanism of API 5L X60 steel exposed to 1.0 M H₂SO₄ was proposed from the evaluation of three vinylalkylimidazolium poly(ionic liquids) (PILs), employing electrochemical and surface analysis techniques. The synthesized PILs were classified as mixed-type inhibitors whose surface adsorption was promoted mainly by bromide and imidazolate ions, which along with vinylimidazolium cations exerted a resistive effect driven by a charge transfer process by means of a protective PIL film with maximal efficiency of 85% at 175 ppm; the steel surface displayed less surface damage due to the formation of metal-PIL complex compounds.