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Aromatic Carboxylic Acids as Corrosion Inhibitors for Aluminium in Alkaline Solution

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Resumo: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 (Kads) and free energy of adsorption (ΔGads) were calculated and discussed. The adsorption process of studied inhibitors on aluminium surface obeys the Langmuir adsorption isotherm.
Autores principais:Madram,Ali Reza
Outros Autores:Shokri,Foroozan; Sovizi,Mohammad Reza; Kalhor,Hamide
Assunto:aluminium corrosion aromatic carboxylic acids inhibitor electrochemical impedance spectroscopy potentiodynamic polarization
Ano:2016
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Fundação para a Ciência e Tecnologia
Idioma:inglês
Origem:SciELO Portugal

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