Abstract
Three novel inhibitors based on 4,5,6,7-tetrahydrobenzo[b]thiophene scaffold were synthesized and characterized. The inhibitive action of the synthesized inhibitors toward carbon steel acid corrosion was investigated using weight loss and polarization techniques. It was found that the three compounds act as good corrosion inhibitor for carbon steel in the acidic medium. The inhibition efficiency was found to increase with increasing concentration and decreased with increasing temperature. The adsorption of inhibitors molecules on the carbon steel surface follows Langmuir adsorption isotherm. The correlation between the inhibitors structures and their corrosion inhibition action was studied by quantum chemical calculations.
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