Novel cationic surfactant based on triazole as a corrosion inhibitor for carbon steel in phosphoric acid produced by dihydrated wet process

摘要

The corrosion inhibition effect of novel cationic surfactant based on triazole derivatives on carbon steel in 7 M H_3PO_4 solution has been evaluated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The inhibition efficiency increases with increasing inhibitor concentration, but it decreases with increasing the temperature. The adsorption of inhibitor is mixed physical and chemical adsorption and found to obey the Langmuir adsorption isotherm. Data obtained from EIS studies were analyzed to model inhibition process through appropriate equivalent circuit model. Potentiodynamic polarization studies have shown that inhibitor acts as a mixed type of inhibitor.