Influence of 4‐amino‐5‐mercapto‐3n‐propyl‐1‐2‐4‐triazole on the corrosion and permeation of hydrogen through mild steel in acidic solutions

The influence of 4‐amino‐5‐mercapto‐3 n‐propyl‐1‐2‐4‐triazole (AMPT) on corrosion and hydrogen permeation through mild steel in 0.5M H₂SO₄ and 1M HCl has been studied using weight loss measurements and various electrochemical techniques. AMPT is found to be more inhibitive in H₂SO₄ than in HCl. Potentiodynamic polarisation studies clearly prove the fact that this compound behaves as a mixed inhibitor; but predominantly as a cathodic inhibitor. Hydrogen permeation studies and AC impedance measurements also indicate an improved performance of the compound in H₂SO₄. The adsorption of this compound on the mild steel surface obeys Temkin’s adsorption isotherm.