Effect of TMN on the Corrosion Inhibition of Carbon Steel in 1 M HCl Solution: Experimental and DFT Studies
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This work aimed to elucidate effect of 1-((thiazol-2-ylimino)methyl)-2-naphthol (TMN) on corrosion inhi- bition of carbon steel in 1 M HCl medium. Corrosion inhibition efficiencies were assessed based pm weight loss measurements and computational Density Functional Theory (DFT) studies. TMN, a very strong adsorbate on surface steel, is expected to show high values of inhibition efficiency since it has excellent electronic properties based on DFT analysis. Inhibition efficiency of TMN increased with increasing concentration. The maximum value was 91.2 at 0.5 mM concentration after 5 hours of immer- sion at 303 K. Study of immersion time at 303 K for different concentrations of the inhibitor indicated an increase in inhibition efficiency with time until 10 hours, followed by a slight decrease until 48 hours. After immersion of 5 hours, corrosion inhibition efficiency increased with increasing temperature from 303 K to 333 K. Adsorption behavior of TMN followed Langmuir adsorption isotherm. For this study, DFT calculations supported the data observed experimentally, confirming that TMN could be utilized as an effi- cient corrosion inhibitor with a strong efficacy.
Abstract
This work aimed to elucidate effect of 1-((thiazol-2-ylimino)methyl)-2-naphthol (TMN) on corrosion inhi- bition of carbon steel in 1 M HCl medium. Corrosion inhibition efficiencies were assessed based pm weight loss measurements and computational Density Functional Theory (DFT) studies. TMN, a very strong adsorbate on surface steel, is expected to show high values of inhibition efficiency since it has excellent electronic properties based on DFT analysis. Inhibition efficiency of TMN increased with increasing concentration. The maximum value was 91.2 at 0.5 mM concentration after 5 hours of immer- sion at 303 K. Study of immersion time at 303 K for different concentrations of the inhibitor indicated an increase in inhibition efficiency with time until 10 hours, followed by a slight decrease until 48 hours. After immersion of 5 hours, corrosion inhibition efficiency increased with increasing temperature from 303 K to 333 K. Adsorption behavior of TMN followed Langmuir adsorption isotherm. For this study, DFT calculations supported the data observed experimentally, confirming that TMN could be utilized as an effi- cient corrosion inhibitor with a strong efficacy.