N-[2-(3-indolyl)ethyl]-cinnamamide synthesized from cinnamomum cassia presl and alkaloid tryptamine as green corrosion inhibitor for Q235 steel in acidic medium

• DOI: 10.1016/j.jmrt.2022.07.122
• Publication Date: 2022-08-02T01:40:29Z
• Authors: Hanlin Shao; Xiaoshuang Yin; Kegui Zhang; Wenzhong Yang; Yun Chen; Ying Liu
• Keywords: Physisorption; Chemisorption; Langmuir adsorption model; Corrosion inhibitor; Hydrochloric acid

In this work, N-[2-(3-indolyl)ethyl]-cinnamamide (IA) synthesized from tryptamine (TA) and cinnamic acid was evaluated as green corrosion inhibitor for Q235 steel in 0.5 M HCl solution by weight loss tests, potentiodynamic polarization (PDP) curve electrochemical impedance spectroscopy (EIS). Gravimetric measurements displayed the maximum inhibition efficiencies of TA IA at 1.0 mM were up to 92.8% 97.6%, respectively. PDP EIS studies revealed they could hinder both hydrogen evolution metal dissolution reactions that inhibiting effect temperature concentration dependent. The surface analysis sample presented through scanning electron microscope (SEM), energy dispersive (EDX) atomic force (AFM), which indicated anti-corrosion ability hydrochloric enhanced inhibitor. adsorptive behavior inhibitors including physisorption chemisorption obeyed Langmuir isotherm. mechanism elucidated determining potential zero charge (Epzc) solid/liquid interface. Quantum chemistry calculation provided a theoretical estimate reactivities ascertain correlation between efficiency molecular structures. Results dynamics (MD) simulations confirm shows better inhibitive performance due higher interaction (– 79.1 kJ mol−1 – 144.16 IA).