The Inhibition Effect of 2-amino-4-chlorobenzothiazole on X65 Steel Corrosion in H2SO4 Solution

In this study, we study 2-amino-4-chlorobenzothiazole (ACBT) as a corrosion inhibitor for X65 steel in H2SO4 medium. The corrosion inhibition performance of ACBT for X65 steel has been studied using electrochemical methods, surface morphology analysis and theoretical calculations. Electrochemical experiment data indicated ACBT belongs to mixed-type corrosion inhibitor. When the concentration of ACBT is 5 mM at 298 K, its corrosion inhibition efficiency is close to 90%. The potentiodynamic polarization curve shows that the inhibition effect of ACBT on the cathodic reaction is significantly greater than that of the anodic reaction. SEM morphology analysis strongly proves the corrosion inhibition performance of ACBT. Quantum chemical calculations and molecular dynamics simulations have revealed the corrosion inhibition properties of ACBT. The adsorption of ACBT on the surface of X65 steel conforms to the Langmuir adsorption isothermal model.