1,7'-dimethyl-2'-propyl-1H,3'H-2,5'-bibenzo[d]imidazole as a corrosion inhibitor of mild steel in 1 M HCl

作者：Patel Niketan S^*; Jauhari Smita; Mehta Girishkumar N

来源：Chemical Papers, 2010, 64(1): 51-55.

DOI：10.2478/s11696-009-0096-5

• imidazole
• acid corrosion inhibitor
• electrochemical impedance spectroscopy
• mild steel

Inhibition effect of imidazole derivative 1,7'-dimethyl-2'-propyl-1H,3'H-2,5'-bibenzo[d]imidazole (DPBI) against mild steel corrosion in 1 M HCl solutions was evaluated using the conventional mass loss method, potentiodynamic polarization, linear polarization, and electrochemical impedance spectroscopy. The mass loss results showed that DPBI is an excellent corrosion inhibitor; electrochemical polarizations data revealed the mixed mode of inhibition; and the results of electrochemical impedance spectroscopy showed that the change in the impedance parameters, charge transfer resistance, and double layer capacitance with the change in the concentration of the inhibitor is due to the adsorption of the molecule leading to the formation of a protective layer on the surface of mild steel. The inhibition action of this compound was assumed to occur via adsorption on the steel surface through the active centers of the molecule.

• 出版日期2010-2