Tobacco Extract for Inhibition of Carbon Steel Corrosion in H₂S-contained NaCl Solution

This study explored the effectiveness of tobacco extract as a corrosion inhibitor for carbon steel in an H2S-containing NaCl solution. The experiments were conducted at room temperature and atmospheric pressure, with a variation in inhibitor concentration and rate of fluid flow. Results showed that the tobacco extract decreases the corrosion rate of carbon steel in the 3.5% NaCl solution. Increasing flow rate and inhibitor concentration significantly affect the corrosion rate of carbon steel. In the NaCl solution, crystalline corrosion product formation of magnetite (Fe3O4) was mainly detected. Furthermore, the presence of H2S leads to forming of a mackinawite (FeS) structure. The inhibition efficiency of 1000 and 2000 ppm tobacco extract in NaCl solution with the presence of H2S is in the range of 24 to 69%.