Azo Schiff base derived from 2-hydroxy-1-naphthaldehyde as corrosion inhibitors for carbon steel in HCl medium: Experimental and theoretical studies

Abstract

3-((E)-(2-hydroxy-4-methylphenyl)diazenyl] has an inhibiting action. The effects of -1-((E)-(2-hydroxy-ethylphenylimino)methyl)naphthalen-2-ol (S1H) on the corrosion process of carbon steel in 1 M HCl were studied using two techniques: effective potentiodynamic polarization methods and hydrogen evolution. Furthermore, scanning electron microscopy (SEM) was used to assess surface morphology as corrosion progressed. The results showed that as the concentration of the synthesized chemical is increased, the efficiency of inhibition increases. The studied S1H had a greatest inhibition efficiency of (90.00% using hydrogen evolution method and 91.33% using the hydrodynamic method) at a concentration of 5.0 mM and a temperature of 298 K, the polarization results showed that the examined S1H compound can be used as a mixed type inhibitor. It showed adsorption behavior. For the S1H inhibitor the system obeys Langmuir isotherms. Results of the methods for effective dynamic polarization and hydrogen gas evolution were supported by SEM analyze. Computational chemistry calculations were accomplished using density functional (DFT) method. Theoretical and experimental methods were discussed and the findings displayed that the inhibition efficiency values by closely agreed.