Effect of three penicillin-based as corrosion inhibitors on Q235 steel in hydrochloric acid

This study investigated the effects of three penicillin-based inhibitors (carbenicillin sodium (CS), ampicillin sodium (AS), and sulbenicillin sodium (SS)) on corrosion inhibition for Q235 steel in 1 M hydrochloric acid solution. The findings revealed that all three inhibitors demonstrated remarkable effectiveness in inhibiting corrosion. Furthermore, the study established a clear correlation between the concentration of these inhibitors and their corrosion inhibition capabilities, indicating that higher concentrations led to enhanced inhibition. Conversely, as the temperature increased, the corrosion inhibition performance of the inhibitors decreased. The most substantial corrosion inhibition efficiencies were achieved at an optimal concentration of 8 mM, with CS reaching 96.82%, AS achieving 96.32%, and SS attaining 94.28% efficiency, respectively. Additionally, the study identified a mixed-type corrosion inhibition mechanism employed by these inhibitors, indicating their involvement in both anodic and cathodic corrosion processes. Moreover, the inhibitors adhered to the Langmuir adsorption isotherm when interacting with the metal surface.