Abstract

MADRAM, Ali Reza; SHOKRI, Foroozan; SOVIZI, Mohammad Reza  and  KALHOR, Hamide. Aromatic Carboxylic Acids as Corrosion Inhibitors for Aluminium in Alkaline Solution. Port. Electrochim. Acta [online]. 2016, vol.34, n.6, pp.395-405. ISSN 0872-1904.  https://doi.org/10.4152/pea.201606395.

The corrosion behavior of aluminium in 1 M NaOH solution, in the absence and presence of some aromatic carboxylic acids, was investigated using potentiodynamic polarization techniques, electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The results among the investigated aromatic carboxylic acids, 4-bromomethyl, 3-bromo and 3-hydroxy benzoic acid were more efficient corrosion inhibitors for aluminium in alkaline medium. The values of different thermodynamic parameters such as adsorption equilibrium constant (K_ads) and free energy of adsorption (ΔG_ads) were calculated and discussed. The adsorption process of studied inhibitors on aluminium surface obeys the Langmuir adsorption isotherm.

Keywords : aluminium corrosion; aromatic carboxylic acids; inhibitor; electrochemical impedance spectroscopy; potentiodynamic polarization.

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