Investigation of corrosion behaviour of X70 microaloy steel in acidic environment in one molar sulfuric acid solution in the presence of benzomidazole and methyl benzomidazole

In the present study, two inhibitors, benzomidazole and methyl benzomidazole, were used to prevent corrosion of X70 micro-alloy steel in acidic environment in one molar of sulfuric acid. For this purpose, both inhibitors in different concentrations were investigated in order to find the best concentration, temperature and efficiency of weight loss tests, polarization and electrochemical impedance spectroscopy (EIS). The chemical composition of the sample was obtained by quantum test and the sample with dimensions of 100 × 50 × 10 mm was prepared in 20 pieces. Corrosion protection performance of inhibitors in 1 M sulfuric acid solution for weight loss test after 10 days of immersion and also in polarization and impedance tests using Auto Lab and Nova1.11 software were evaluated. . As a result, the best inhibitory efficiency of benzomidazole at a concentration of 600 ppm was equal to 37% and methyl benzomidazole at a concentration of 400 ppm equal to 30%, and in the combined state of these two solutions have the ability to increase corrosion efficiency up to 73%. As a result, both of these inhibitors showed practical ability to be used in industrial environments.