Thiol–ene Click Chemistry Synthesis of L-Cysteine-Grafted Graphene Oxide As a New Corrosion Inhibitor for Q235 Steel in Acidic Environment

• DOI: 10.1021/acs.langmuir.4c00932
• Publication Date: 2024-06-05T14:34:52Z
• Authors: Qingkai Chu; Haobing Yang; Zhixiong Liu; Xiaofan Li; Guoyan Niu; Jin Zhang; Xianhui Zhang; Yong Li; Yuwei Ye
• Keywords: Hydrochloric acid; Thiol; Corrosion inhibitor; Carbon steel; Ene reaction

l-cysteine, as an eco-friendly and nontoxic corrosion inhibitor, was directly covalently linked to the carbon/carbon double bonds of GO flakes by a thiol–ene click reaction avoid decreasing number hydrophilic oxygen-containing polar functionalities. The inhibition performances Cys-GO toward Q235 steel (QS) in diluted hydrochloric acid were studied electrochemical methods. charge transfer-controlled process, manifested mixed-type inhibitor. efficiency (η) for QS showed first-increase-and-then-decrease trend with increasing concentrations. optimum concentration 15 mg L–1, according η value up 90%. adsorbed on surface form protective barrier responsible efficient inhibition. Langmuir adsorption isotherm model fitted well experiment data, indicating monolayer adsorption. Furthermore, coordinate covalent bonds, π-back-donation effect, electrostatic attraction surface.