An Inhibitor (3-Methylisoquinoline) Prevents Mild Steel Corrosion in 1 M HCl Media

The inhibitor 3-methylisoquinoline at various concentrations ranging from 100 to 600 ppm was used in this work, and its effect on the corrosion of mild steel in 1M HCl was examined. The results showed that this type of inhibitor is effective and of excellent quality, as the efficiency of the inhibitor increases when the concentration of the inhibitor is increased at 303 K and 600 ppm, and as the temperature increases from 313 to 323 K, the efficiency decreases. Adsorption is of a physical type when it is in low concentrations and mixed with high concentrations, the thermodynamic parameters of the system such as activation energy, enthalpy energy, and free energy of adsorption, all of which increase with increasing concentration of inhibitor.