MPEC-IMI as an effective green inhibitor to protect Q235 steel in 0.5 M HCl medium
Imidazole (IMI)-based polyethylene glycol monomethyl ether (MPEC-IMI) as a novel green corrosion inhibitor was synthesized to protect the Q235 steel in 0.5 M HCl corrosive medium at 318 K. The inhibition performance of MPEC-IMI was investigated by weight loss measurement, the electrochemical method (Tafel and EIS) and surface analysis (SEM and EDX). The results reveal that the MPEC-IMI shows enhanced anticorrosion performance for carbon steel, which is attributed to the formation of the adsorptive protection film on the surface, and the type of adsorption basically obeys the Langmuir monolayer adsorption. Furthermore, when the concentration of MPEC-IMI is 300 mg L−1, the corrosion inhibition efficiency can reach up to 92.00%. In support of further study of the corrosion inhibition behavior by virtue of quantum chemical calculation and molecular dynamics simulations, the results show that the MPEC-IMI molecule has high reactivity and strong interaction on the iron surface.
KeywordsGreen corrosion inhibitor Acid corrosion medium Polyethylene glycol monomethyl ether Quantum chemical calculations Molecular dynamics simulations
This work was supported by the National Nature Science Foundation of China (51673040), the Prospective Joint Research Project of Jiangsu Province (BY2016076-01), the Scientific Innovation Research Foundation of College Graduate in Jiangsu Province (KYLX16_0266), and by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD; 1107047002). This work was also supported by the Fundamental Research Funds for the Central Universities (2242015k30001), the Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China (BA2016105), based on scientific research of SRTP of Southeast University (T16192020), and the Scientific Research Foundation of the Graduate School of Southeast University (YBJJ1417).