Tetracycline as a Powerful Green Corrosion Inhibitor for Carbon Steel in the High-temperature with Acidic Environment

For the first time, corrosion inhibition of carbon steel (ck45) in 0.5 M phosphoric acid was studied in the absence and presence of the Tetracycline drug as a friendly corrosion inhibitor. The corrosion resistance was calculated using electrochemical impedance spectroscopy (EIS) and the determination of the polarization curves. The corrosion tests were carried out with different inhibitor concentrations (200, 300, 600, 800, and 1000 ppm) at room temperature, and the most significant inhibitor efficiency was found to be 81 % at 1000 ppm concentration. According to the potentiodynamic polarization measurement results, Tetracycline is a mixed-type inhibitor. The activation energy, the thermodynamic parameters, and the adsorption isotherm were determined from the electrochemical data. The effect of temperature on the corrosion behavior of ck45 steel in 0.5 M H3</sub>PO4</sub> with drug addition was also investigated. It was discovered that the inhibitory efficiency improves with rising temperature, reaching 95 % at 55 °C. Optical microscopy and scanning electronic microscopy (SEM) were employed to investigate the effect of the Tetracycline drug on the surface morphology of metal. </em>