Anethole trithione (5-(4-methoxyphenyl)-3h-1, 2-dithiole-3-thione, MDT), as a green andenvironmentally friendly corrosion inhibitor, is studied for bridge steel (BS) in hydrochloric acidmedium via electrochemical impedance spectroscopy (EIS) technology, open circuit potential (OCP)test, and potentiodynamic polarization (PDP) curve test, scanning electron microscope (SEM) test,quantum chemistry calculation (QCC) and molecular dynamics (MD) simulation. The open circuitpotential indicates that the steel electrode can reach a stable state after the bridge steel is soaked inhydrochloric acid for 1200 seconds. The polarization curve data show that MDT can reduce the value ofthe corrosion current density, and as the temperature increases, the corrosion inhibition efficiency ofMDT for bridge steel increases significantly. In addition, the adsorption isotherm model study showsthat the adsorption of MDT at the surface of BS is consistent with Langmuir adsorption. Both QCC andMD show that MDT can be adsorbed at the surface of bridge steel in parallel way to obtain the largestcoverage area..
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