Effect of diamino((2-((2- aminoethyl)amino)ethyl)amino)methanethiol on the Corrosion Resistance of Carbon Steel in Simulated Concrete Pore Solutions

摘要

Diamino((2-((2-aminoethyl)amino)ethyl)amino)methanethiol was synthesized, and its inhibitionperformance on carbon steel in simulated concrete pore solutions was studied by means ofelectrochemical techniques, scanning electron microscopy and quantum chemical calculation. Theresults showed that the inhibiting performance of this inhibitor was excellent, and the obtainedinhibition efficiencies from different experiments were in good agreement from different experiments.Polarization curves revealed that the inhibitor acted as a mixed-type inhibitor, suppressing the anodicand cathodic corrosion reaction processes of carbon steel by forming a protective film on its surface.Electrochemical impedance spectroscopy measurements revealed that the charge transfer process in thecorrosion reaction was retarded because of the protection film formed on the surface of the carbonsteel. The absorption mechanism of the inhibitor molecules on the carbon steel surface was analysedusing a quantum chemical study.