A novel imidazoline derivative as corrosion inhibitor for P110 carbon steel in hydrochloric acid environment

Abstract

A novel imidazoline derivative, 2-methyl-4-phenyl-1-tosyl-4, 5-dihydro-1H-imidazole (IMI), was prepared and investigated as corrosion inhibitor for P110 carbon steel in 1.0 M HCl solution by weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The inhibition efficiency increased with the rising concentration of IMI inhibitor. The test results and fitting data indicated that the IMI behaved as a mixed-type inhibitor and obeys the Langmuir adsorption isotherm. Scanning electron microscopy (SEM) was carried out to investigate the surface of carbon steel specimens, showing great protection from aggressive solution. Finally, inhibition mechanism of IMI on metal surface was further discussed.

Keywords

Carbon steel / Weight loss / Electrochemical / SEM / Langmuir adsorption

Acknowledgments

This work was financially Supported by Technology support Program (15ZC2141&16ZCxxxx) and College Students Innovation and Entrepreneurship Training Program in Sichuan province.

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