Anticorrosive Properties of Chitosan for the Acid Corrosion of Aluminium

• Autor(a) principal: Abd-El-Nabey,B. A.
• Data de Publicação: 2015
• Outros Autores: Goher,Y. M., Fetouh,H. A., Karam,M. S.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042015000400004
• topic: aluminium; polarization curves; pitting corrosion; Electrochemical Impedance Spectroscopy (EIS); charge transfer; adsorption

Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were used to measure the corrosion rate of aluminium in 0.1 M HCl in the absence and presence of different concentrations of chitosan. Inhibition efficiency up to 90% in the presence of 0.028 g/L chitosan was achieved. Increasing the concentration of chitosan shifted the breakdown potential, Eb, of aluminium to more noble values and inhbitied the pitting corrosion of aluminium. Measurements of the break potential, Eb, and the electrical double layer capacity (Qdl) indicated that chitosan is adsorbed at the aluminium/solution interface.