Using Gaviscon Expired Drug as Corrosion Inhibitor in Acidic Solution to Reduce Corrosion in Carbon Steel

The use of Gaviscon expired drug as the corrosion inhibitor on the carbon steel was studied in the 0.1 M HCl solution at 303, 313, 323 and 333 K by electrochemical method. Gaviscon was demonstrated to be an effective inhibitor for carbon steel, the efficiency reached 80.7% at concentration of inhibitor 24 mL/L at 303 K, 91.973% for 48 mL/L at 313 K, 89.42% for 48 mL/L at 323 K and 97.81% for 24 mL/L at 333 K. The polarization resistance of Gaviscon was revealed, and the highest value was 121.758 for 24 mL/L at 333 K. The surface morphology of the carbon steel was analyzed using scanning electron microscopy (SEM) to show the film randomly distributed throughout the entire carbon steel surface. The antibacterial activity of the inhibitor was also tested by agar well diffusion which exhibit that no inhibition zone was observed, indicating that the Gaviscon drug was reactivity against E. coli. and S. aureus bacterial. Fourier-transform infrared spectroscopy (FTIR) for the Gaviscon drug confirmed the inhibitory role of inhibition efficiency.