Inhibition effect of N-propargyl saccharin as corrosion inhibitor of C38 steel in 1 M HCl, experimental and theoretical study

The corrosion inhibition method is the technique most used to reduce the cost of corrosion in the indus -trial field, especially in the acidic environment, in which the organic inhibitor has been widely used. For this, the corrosion inhibition of C38 steel in molar hydrochloric acid was examined using N-Propargyl Saccharin (NPS) as an inhibitor. Electrochemical and surface analyzes were performed to identify how this compound inhibits the corrosion of C38. The stark results showed that the inhibitors act as mixed types of inhibitors, reducing the anode and cathode current densities. In addition, this inhibitor improves the resistance to charge transfer of C38 steel, increasing the thickness of the protective layer when the concentration of the inhibitor has been increased. The thermodynamic parameters and the theoretical observations (DFT, MC, and MD) confirm the inhibitor's adsorption interaction with the metal surface. (c) 2022 Published by Elsevier B.V.