Abstract
Corrosion kinetics of 99.6% aluminium covered by a thin spontaneously formed oxide film in hydrochloric acid solution with and without the presence of substituted N-aryl pyrroles was studied using electrochemical impedance spectroscopy and quasi steady-state polarization. Measurements were performed on a rotating disc electrode in an argon-deaerated solution in the temperature range 20 to 50°C. The addition of inhibitor considerably increases overvoltage of the cathodic process (HER) and shifts Ecorr to negative potential values. The activation energy of the hydrogen evolution reaction was Ea=50±5kJmol−1 and was not affected by the presence of inhibitor. The inhibitory action occurs by π-bonding between the adsorbed inhibitor molecules and the electrode surface. The electrode coverage follows the Langmuir adsorption isotherm with an adsorption equilibrium constant K=1.1–2.64×105dm3mol−1. The adsorption of organic compound prevents the adsorption of chloride ions and slow down the rate of corrosion.
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METIKOŠ-HUKOVIĆ, M., BABIĆ, R. & GRUBAČ, Z. Corrosion protection of aluminium in acidic chloride solutions with nontoxic inhibitors. Journal of Applied Electrochemistry 28, 433–439 (1998). https://doi.org/10.1023/A:1003200808093
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DOI: https://doi.org/10.1023/A:1003200808093