Inhibition of Q235 Steel in 1 mol/L HCl Solution by a New Efficient Imidazolium Schiff Base Corrosion Inhibitor
An imidazole Schiff base(MIX)corrosion inhibitor was synthesized via processes of ami-dation,dehydration cyclization,and quaternization at different temperatures with oleic acid,diethylenetri-amine,n-butane iodide and cinnamaldehyde as raw material.The corrosion inhibition performance and mechanism of MIX on Q235 steel in 1.00 mol/L HCl were systematically investigated by means of mass loss measurement,electrochemical testing,and surface analysis methods,as well as theoretical simula-tions.The results showed that the corrosion inhibition efficiency determined by mass loss method,electro-chemical impedance spectroscopy(EIS),and potentiodynamic polarization(Tafel)were 98.64％,96.93％,and 99.15％,respectively for adding a dose of MIX 2 mmol/L in the 2.00 mmol/L HCl solution,indicating that MIX can exhibit excellent corrosion inhibition performance in HCl environments.Electrochemical test-ing and isothermal adsorption models indicate that MIX is a cathodic corrosion inhibitor that can sponta-neously adsorb on the surface of Q235 steel,following the Langmuir adsorption isotherm model.MIX can form a stable protective film on the surface of Q235 steel,further hindering the charge transfer rate within the corrosion system.XPS,EDS and FT-IR analysis confirmed that MIX molecules may be adsorbed on the surface of Q235 steel.Density functional theory(DFT)showed that the active site of MIX was phenyl,and the N atom on the imidazole ring.Molecular dynamics(MD)further confirmed that MIX may be ad-sorbed on the surface of Q235 steel.MIX can exhibit excellent corrosion inhibition performance in HCl en-vironments,mainly due to the formation of a stable protective film on the surface of Q235 steel,which re-duces the charge transfer rate within the corrosion system.
imidazole Schiff baseelectrochemistrymass loss experimentcorrosion inhibition per-formancetheoretical calculation
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