Experimental and theoretical studies of 1-Benzyl pyridazinium bromide as green inhibitor for mild steel corrosion

Abstract

In this work, a novel 1-Benzylpyridazinium bromide (BzPyBr) was synthesized using microwave irradiation and characterized by proton, carbon-13 and mass spectroscopy. The corrosion inhibition behavior was investigated in 0.5 M sulfuric acid on mild steel (MS) via experimental and theoretical methods. BzPyBr exhibits the best efficiency of 97.52% at 1000 ppm (at 303K). PDP studies revealed it behaves as a mixed-type corrosion inhibitor whereas impedance data confirmed its adsorption on the MS surface. Surface topography as examined by AFM and SEM along with EDS depicted a smooth surface in presence of the studied ionic liquid. Langmuir isotherm model was found to be acceptable for the adsorption phenomenon exhibited by the inhibitor. ΔGads was found to be suggestive of physical and chemical adsorption of the studied inhibitor on the mild steel surface. In addition, Quantum studies based on the DFT method supported the experimental data.

Keywords

• Adsorption
• 1-Benzylpyridazinium bromide
• Corrosion
• Inhibitor
• Ionic liquid
• Mild steel