Thiophenol as an inhibitor for the corrosion and hydrogen permeation through mild steel in acidic solutions

The influence of thiophenol on the corrosion and hydrogen permeation 1M HCl and 0.SM H₂SO₄ has weightloss measurements, gasometric studies and other electrochemical techniques. Thiophenol inhibits the corrosion of mild steel in both the acids, but it is found to be more effective in H₂SO₄. It behaves predominantly as a cathodic inhibitor. It brings down the permeation current in both the acids, but is more effective in H₂SO₄. The adsorption of thiophenol on the mild steel surface from both the acids obeys Temkin’s adsorption isotherm.