The Correlation between Structure and Corrosion Inhibition Activity of 4,5-Diphenyl-1-vinylimidazole Derivative Compounds towards Mild Steel in 1% NaCl Solution

Three derivatives of 4,5-diphenyl-1-vinylimidazole: compound 1 (2-hexyl-4,5-diphenyl-1-vinyl-1H-imidazole), 2 (2,4,5-triphenyl-1-vinyl-1H-imidazole), and 3 (2-(4-methoxyphenyl)-4,5-diphenyl-1-vinyl-1H-imidazole) have been synthesized utilizing microwave assisted organic synthesis (MAOS) method, in order to investigate the correlation between structure and corrosion inhibition activity towards mild steel. The analysis of degree of surface coverage of each compound showed the linearity of Langmuir isotherm adsorptions, which represent the monolayer formation of each compound on mild steel surface. The free Gibbs adsorption energy values, DG0ads, of each synthesized compound is negative, which indicated the spontaneity of adsorption process of each compound on mild steel surface and also have the potential to interact with mild steel through semi-physiosorption and/or semi-chemisorption.