Corrosion inhibition of mild steel by bromide-substituted imidazoline in hydrochloric acid

• Bromide-substituted imidazoline inhibitor was studied in 0.5 M HCl on mild steel.
• The increasing temperature decreases the inhibition efficacy of compound.
• It acts as a mixed-type inhibitor by controlling activation of anodic and cathodic reactions.
• The adsorption behavior of inhibitor is well fitted by Langmuir isotherm.

A new imidazoline compound, 2-(2-tribromomethyl-4,5-dihydro-imidazol-1-yl)-ethylamine (3-IM) was synthesized and its inhibitory effect on the corrosion of mild steel in 0.5 M HCl solution was examined by weight loss, potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS). The experimental results show that 3-IM behaves as a mixed-type inhibitor and the inhibition efficiency increases with the increasing compound concentrations. The adsorption actions of 3-IM molecules are well fitted by Langmuir isotherm, while the protection property of the adsorptive layer decreases as the temperature increases.

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