Novel Corrosion Inhibitor for Steel in 0.5 M H₂SO₄ Containing Halide Ions

摘要

Silene marmarica was studied as an environmentally friendly inhibitor for steel corrosion in 0.5 M H₂SO₄. The effect of iodide and chloride ions on the inhibition efficiency of Silene marmarica, were studied by using potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The results showed that Silene Marmarica inhibited the corrosion of steel in 0.5 M H₂SO₄, where the inhibition efficiency increased with the increasing concentration of Silene marmarica. The results also showed that the presence of iodide produced a synergistic effect on the inhibition efficiency while, the presence of chloride ion decreased the inhibition efficiency of Silene marmarica. The adsorption behavior of Silene marmarica in the absence and presence of iodide or chloride was studied and was found to fit both the Langumir adsorption isotherm and the Kinetic-Thermodynamic model.